CN103441948A - Data access method, network card and storage system - Google Patents
Data access method, network card and storage system Download PDFInfo
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- CN103441948A CN103441948A CN2013102775113A CN201310277511A CN103441948A CN 103441948 A CN103441948 A CN 103441948A CN 2013102775113 A CN2013102775113 A CN 2013102775113A CN 201310277511 A CN201310277511 A CN 201310277511A CN 103441948 A CN103441948 A CN 103441948A
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Abstract
The embodiment of the invention provides a data access method, a network card and a storage system, and relates to the field of communication. Network delay can be reduced, and data access speed can be increased. An iSCSI protocol processing module and a cache module are arranged in the network card, wherein the cache module is used for caching data which need to be stored by a server to an IP-SAN. The data access method includes the steps that whether first data which are accessed by SCSI commands sent by the server exist in the cache module or not is judged, wherein the SCSI commands are read instructions or written instruments; cache processing is conducted on the first data between the server and the IP-SAN according to a judgment result; response information is returned to the server. The data access method, the network card and the storage system are used for iSCSI data storage.
Description
Technical field
The present invention relates to areas of information technology, relate in particular to a kind of data access method, network interface card and storage system.
Background technology
ISCSI (Internet Small Computer System Interface, Internet Small Computer Systems Interface) technology, a kind of at IP (Internet Protocol, Internet protocol) move the memory technology of SCSI (Small Computer System Interface, small computer system interface) agreement on network.Because iscsi technology is safeguarded simple, easily expansion, and hardware cost is relatively cheap, makes iscsi technology be widely used.
In current iscsi technology, when the server of iSCSI sends data access request, as read request or write request, the scsi device of server drives and can generate a corresponding scsi command, this scsi command is sent on the network interface card that is provided with the iSCSI protocol process module, iSCSI protocol process module via network interface card is packaged into scsi command and passes through TCP (Transmission Control Protocol, transmission control protocol)/processing such as IP stack obtain the iSCSI message and send to LAN (Local Area Network, local area network (LAN)) memory device carries out corresponding operating, as carry out the storage of data, perhaps from IP-SAN (Storage Area Network, storage area network) obtain data and be back to server through network interface card.
But because server need to be sent to IP-SAN via the processing of network interface card again to the access of data in IP-SAN, carry out corresponding operating by IP-SAN, then just to server, send response message, the process of whole data access is comparatively complicated, thereby network delay is larger, has affected data access speed.
Summary of the invention
Embodiments of the invention provide a kind of data access method, network interface card and storage system, can reduce the network delay of the data access between server and IP-SAN, improve data access speed.
For achieving the above object, embodiments of the invention adopt following technical scheme:
First aspect, a kind of data access method is provided, be applied to network interface card, be provided with Internet Small Computer Systems Interface iSCSI protocol process module and cache module in described network interface card, described cache module need to be stored to the data of storage area network IP-SAN for caching server, and described method comprises:
Judge the first data that the described cache module scsi command whether presence server sends is accessed, described scsi command is for reading instruction or write command;
According to judged result, between described server and described IP-SAN, described the first data are carried out to caching process;
Return to response message to described server.
In conjunction with first aspect, but in the first implementation, described according to judged result, between described server and described IP-SAN, described the first data are carried out to caching process and comprise:
If there are described the first data in described cache module, and described scsi command is write request, by described the first Data Update to described cache module;
If there are not described the first data in described cache module, and described scsi command is write request, and described the first data are write to described cache module;
If there are described the first data in described cache module, and described scsi command is read request, from described cache module, reads described the first data;
If there are not described the first data in described cache module, and described scsi command is read request, and described read request is encapsulated as to an iSCSI protocol massages,
A described iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN returns to the first data that a described iSCSI protocol massages is accessed,
Receive described the first data that described IP-SAN sends,
Described the first data are submitted to server,
At described cache module, described the first data are carried out to buffer memory.
But in conjunction with first aspect, the first implementation, but, in the second implementation, described cache module is magnetic internal memory or phase transition internal memory.
But in conjunction with first aspect, first and second kind of implementation, but, in the third implementation, described method also comprises:
Whether the total capacity that judges the dirty page data of cache module is greater than the first capacity threshold, and described the first capacity threshold is for limiting described dirty page data taking up room at described cache module;
When the total capacity of the dirty page data of described cache module is greater than the first capacity threshold, the dirty page data of described cache module is packaged into to the 2nd iSCSI protocol massages;
Described the 2nd iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN is stored the data of described second protocol message transmissions.
But in conjunction with first aspect, first and second kind of implementation, but, in the 4th kind of implementation, described method also comprises:
The flush buffers instruction that reception server sends;
According to described flush buffers instruction, the dirty page data of cache module is packaged into to the 3rd iSCSI protocol massages;
Described the 3rd iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN is stored the data of described the 3rd protocol massages transmission.
But in conjunction with first aspect, first and second kind of implementation, but in the 5th kind of implementation,
Whether be greater than the very first time threshold value memory time that judges the dirty page data of cache module, described very first time threshold value is for limiting the memory time of described dirty page data at described cache module;
While having the first dirty page data that is greater than the very first time threshold value memory time in described cache module, the described first dirty page data is packaged into to the 4th iSCSI protocol massages;
Described the 4th iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN is stored the data of described the 4th protocol massages transmission.
Second aspect, a kind of network interface card is provided, be provided with Internet Small Computer Systems Interface iSCSI protocol process module and cache module in described network interface card, described cache module need to be stored to the data of storage area network IP-SAN for caching server, be provided with Internet Small Computer Systems Interface iSCSI protocol process module and cache module in described network interface card, described cache module need to be stored to the data of storage area network IP-SAN for caching server, and described network interface card also comprises:
The first judging unit, for the first data that judge that the described cache module scsi command whether presence server sends is accessed, described scsi command is for reading instruction or write command;
Processing unit for according to judged result, carries out caching process to described the first data between described server and described IP-SAN;
Response unit, for returning to response message to described server.
In conjunction with second aspect, but in the first implementation, described processing unit specifically for:
If there are described the first data in described cache module, and described scsi command is write request, by described the first Data Update to described cache module;
If there are not described the first data in described cache module, and described scsi command is write request, and described the first data are write to described cache module;
If there are described the first data in described cache module, and described scsi command is read request, from described cache module, reads described the first data;
If there are not described the first data in described cache module, and described scsi command is read request, and described read request is encapsulated as to an iSCSI protocol massages,
A described iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN returns to the first data that a described iSCSI protocol massages is accessed,
Receive described the first data that described IP-SAN sends,
Described the first data are submitted to server,
At described cache module, described the first data are carried out to buffer memory.
But in conjunction with second aspect, the first implementation, but, in the second implementation, described cache module is magnetic internal memory or phase transition internal memory.
But in conjunction with second aspect, first and second kind of implementation, but, in the third implementation, described network interface card also comprises:
Described network interface card also comprises:
Whether the second judging unit, be greater than the first capacity threshold for the total capacity of the dirty page data that judges cache module, and described the first capacity threshold is for limiting described dirty page data taking up room at described cache module;
The first encapsulation unit, while for the total capacity of the dirty page data at described cache module, being greater than the first capacity threshold, be packaged into the 2nd iSCSI protocol massages by the dirty page data of described cache module;
The first transmitting element, for described the 2nd iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN is stored the data of described second protocol message transmissions.
But in conjunction with second aspect, first and second kind of implementation, but, in the 4th kind of implementation, described network interface card also comprises:
Receiving element, the flush buffers instruction sent for reception server;
The second encapsulation unit, for according to described flush buffers instruction, be packaged into the 3rd iSCSI protocol massages by the dirty page data of cache module;
The second transmitting element, for described the 3rd iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN is stored the data of described the 3rd protocol massages transmission.
But in conjunction with second aspect, first and second kind of implementation, but, in the 5th kind of implementation, described network interface card also comprises:
The 3rd judging unit, for whether being greater than memory time of the dirty page data that judges cache module very first time threshold value, described very first time threshold value is for limiting the memory time of described dirty page data at described cache module;
The 3rd encapsulation unit, for when there is the first dirty page data that is greater than the very first time threshold value memory time in described cache module, be packaged into the 4th iSCSI protocol massages by the described first dirty page data;
The 3rd transmitting element, for described the 4th iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN is stored the data of described the 4th protocol massages transmission.
The third aspect, provide a kind of storage system, comprising:
Network interface card, be provided with Internet Small Computer Systems Interface iSCSI protocol process module and cache module in described network interface card, described cache module need to be stored to the data of storage area network IP-SAN for caching server, described network interface card is used for: judge the first data that the described cache module scsi command whether presence server sends is accessed, described scsi command is for reading instruction or write command; According to judged result, between described server and described IP-SAN, described the first data are carried out to caching process;
And IP-SAN and server.
In conjunction with the third aspect, but in the first implementation,
Described according to judged result, between described server and described IP-SAN, described the first data are carried out to caching process and comprise:
If there are described the first data in described cache module, and described scsi command is write request, by described the first Data Update to described cache module;
If there are not described the first data in described cache module, and described scsi command is write request, and described the first data are write to described cache module;
If there are described the first data in described cache module, and described scsi command is read request, from described cache module, reads described the first data;
If there are not described the first data in described cache module, and described scsi command is read request, and described read request is encapsulated as to an iSCSI protocol massages,
A described iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN returns to the first data that a described iSCSI protocol massages is accessed,
Receive described the first data that described IP-SAN sends,
Described the first data are submitted to server,
At described cache module, described the first data are carried out to buffer memory.
But in conjunction with the third aspect, the first implementation, but in the second implementation,
Described cache module is magnetic internal memory or phase transition internal memory.
Embodiments of the invention provide a kind of data access method, network interface card and storage system, cache module is set in network interface card, when server transmission scsi command is accessed the first data, first judge in cache module and whether have described the first data, according to judged result, described the first data are carried out to caching process, after caching process, just can return to response message to described server.Compared to prior art, the data access process is just responded the data access of server through the IP-SAN corresponding operating after processing at network interface card again, therefore simplified the process of data access, just can return to response signal after at network interface card, carrying out caching process, thereby reduce the network delay of the data access between server and IP-SAN, improve data access speed.
The accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The applied memory system architecture schematic diagram of a kind of data access method that Fig. 1 provides for the embodiment of the present invention;
A kind of data access method flow chart that Fig. 2 provides for the embodiment of the present invention;
The method flow diagram of the another kind of data access that Fig. 3 provides for the embodiment of the present invention;
A kind of network interface card structural representation that Fig. 4 provides for the embodiment of the present invention;
The another kind of network interface card structural representation that Fig. 5 provides for the embodiment of the present invention;
Another network interface card structural representation that Fig. 6 provides for the embodiment of the present invention;
Another network interface card structural representation that Fig. 7 provides for the embodiment of the present invention;
The another kind of network interface card structural representation again that Fig. 8 provides for the embodiment of the present invention;
The another kind of network interface card structural representation again that Fig. 9 provides for the embodiment of the present invention.
embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment obtained, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of data access method, be applied to network interface card 10, in the residing storage system of described network interface card 10, the software configuration schematic diagram of each device can be as shown in Figure 1, described storage system comprises: network interface card 10, IP-SAN20 and server 30, wherein, the software configuration of described server 30 can comprise: application program 301, file system 302 and scsi device drive 303, the software configuration of described network interface card 10 can comprise cache module 101, iSCSI protocol process module 102, ICP/IP protocol stack 103 and network card equipment drive 104, wherein said cache module 101 need to be stored to the data of IP-SAN for caching server.It should be noted that, in storage system shown in Fig. 1, the software configuration of each equipment just illustrates, in practical application, can also there be other software configurations in network interface card and server, but described network interface card need to be provided with scsi device and drive and cache module, described cache module 101 can be non-volatile memory medium: the magnetic internal memory, as STT RAM (Shared Transistor Technology Random Access Memory, share the random access memory of transistor technology), or phase transition internal memory, as PCM (Phase-Change Memory, phase transition internal memory), using magnetic internal memory or the phase transition internal memory storage medium as cache module, can realize very desirable data access time delay, and not obliterated data cuts off the power supply, guaranteed the data consistency of cache module 101 with IP-SAN20.
As shown in Figure 2, described data access method is applied to network interface card, specifically comprises:
Describedly judge whether cache module exists the process of the first data that scsi command accesses to inquire about the first data that scsi command accesses and whether hit buffer memory, example, the data address of storing in the address of described the first data and described cache module can be mated one by one, when the data that have matching addresses, the first data that cache module in network interface card exists scsi command to access are described, i.e. the first data hit buffer memory; When the data that do not have matching addresses, the first data that the cache module in network interface card does not exist scsi command to access are described, i.e. the miss buffer memory of the first data.
Concrete, if there are described the first data in described cache module, and described scsi command is write request, will described the first Data Update described cache module extremely.
If there are not described the first data in described cache module, and described scsi command is write request, and described the first data are write to described cache module.
If there are described the first data in described cache module, and described scsi command is read request, from described cache module, reads described the first data.
If there are not described the first data in described cache module, and described scsi command is read request, can at first described read request be encapsulated as to an iSCSI protocol massages, then a described iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN returns to the first data that a described iSCSI protocol massages is accessed, receive described the first data that described IP-SAN sends, and described the first data are submitted to server, at described cache module, described the first data are carried out to buffer memory.
Network interface card can, according to the dissimilar of described the first data and different disposal result, return to different response messages., can return and read response message or read failure response information for reading instruction as the first data; The first data are write command, can return and write response message or write failure response information.
So, cache module is set in network interface card, when server transmission scsi command is accessed the first data, first judge in cache module and whether have described the first data, according to judged result, described the first data are carried out to caching process, after caching process, just can return to response message to described server.Compared to prior art, the data access process is just responded the data access of server through the IP-SAN corresponding operating after processing at network interface card again, therefore simplified the process of data access, just can return to response signal after at network interface card, carrying out caching process, thereby reduce the network delay of the data access between server and IP-SAN, improve data access speed.
It should be noted that, in order to guarantee the data consistency of cache module and IP-SAN, need to be processed the dirty page data in cache module.When usining page during as the unit of the high-speed cache in cache module, if system has been revised the data in the high-speed cache, the residing page of the data that are modified just is marked as dirty page data.Network interface card can be by judging whether dirty page data total capacity is greater than the first preset capacity threshold value, dirty page data and whether is greater than very first time threshold value or the no processing that exists the flush buffers instruction to carry out dirty page data memory time.
Example, when network interface card carries out the processing of dirty page data according to dirty page data total capacity, at first can judge whether the total capacity of the dirty page data of described cache module is greater than the first capacity threshold; When the total capacity of the dirty page data of described cache module is greater than the first capacity threshold, the dirty page data of described cache module is packaged into to the 2nd iSCSI protocol massages; Then described the 2nd iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN is stored the data of described second protocol message transmissions.It should be noted that, described the first capacity threshold is for limiting described dirty page data taking up room at described cache module, can set in advance according to the concrete structure of network interface card, usually relevant to the overall storage capacity of cache module, preferably, the ratio of the overall storage capacity of described the first capacity threshold and described cache module is more than or equal to 70 percent, is less than or equal to 90 percent.
When network interface card, according to flush buffers, the processing of dirty page data is carried out in instruction, the flush buffers instruction at first can reception server sent; Then according to described flush buffers instruction, the dirty page data of described cache module is packaged into to the 3rd iSCSI protocol massages; Finally described the 3rd iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN is stored the data of described the 3rd protocol massages transmission.The flush buffers instruction that network interface card can send according to server like this, be updated to IP-SAN by the dirty page data in cache module in real time, guarantees the data consistency of cache module and IP-SAN.
When network interface card carries out the processing of dirty page data according to dirty page data memory time, whether be greater than the very first time threshold value memory time that at first can judge the dirty page data of described cache module; While having the first dirty page data that is greater than the very first time threshold value memory time in described cache module, the described first dirty page data is packaged into to the 4th iSCSI protocol massages; Then described the 4th iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN is stored the data of described the 4th protocol massages transmission.It should be noted that, described very first time threshold value is preset value, and for limiting described dirty page data in the memory time of described cache module, described very first time threshold value is the time threshold that preset value is generally millisecond (ms) or second (s) level, example, as 5s, 10s etc.
In actual applications, network interface card can judge whether dirty page data total capacity is greater than the first preset capacity threshold value, whether dirty page data is greater than very first time threshold value and whether exists the flush buffers instruction to carry out the processing of dirty page data memory time simultaneously, when above-mentioned any one situation reaches satisfied, be the corresponding processing of carrying out dirty page data, can effectively guarantee like this data consistency of cache module and IP-SAN.
Especially, carrying out transfer of data according to the iSCSI agreement, transmission is not only a message usually at every turn, and data may be packaged into a plurality of messages and transmit.So it is a plurality of that the 2nd iSCSI protocol massages can have, in like manner, the 3rd, the 4th protocol massages also can have a plurality of.
The embodiment of the present invention provides a kind of concrete grammar of data access, as shown in Figure 3, comprising:
When operating the indication server to the application program of server, the user carries out data access, as reading out data or data writing, server can the generated data access request, described data access request is generated by the file system of server usually, then the scsi device of server drives and can generate a corresponding scsi command according to described data access request, and described scsi command is for reading instruction or write command.
Describedly judge whether the cache module in network interface card exists the process of the first data that scsi command accesses to inquire about the first data that scsi command accesses and whether hit buffer memory, example, the data address of storing in the address of described the first data and described cache module can be mated one by one, when the data that have matching addresses, the first data that cache module in network interface card exists scsi command to access are described, i.e. the first data hit buffer memory; When the data that do not have matching addresses, the first data that the cache module in network interface card does not exist scsi command to access are described, i.e. the miss buffer memory of the first data.For example, the data at server wants reading address 0x1000 place, the address of the first data that scsi command is accessed is 0x1000, judge the data that whether have this address of 0x1000 in the buffer memory of cache module, if have, think the cache hit of cache module, i.e. the first data hit.
The first data that cache module in network interface card exists scsi command to access, perform step 303, and the first data that the cache module in network interface card does not exist scsi command to access, perform step 308.
Due in step 302, network interface card judges the first data hit buffer memory, and be write request because step 303 network interface card judges described scsi command, therefore the first data in write request can be directly overlayed to the position of data identical with described the first data in cache module, former data are upgraded, without taking new spatial cache.
Step 305, network interface card judge whether described scsi command is read request.If perform step 306.
Because scsi command in practical application is a command set, except the request of reading and writing data, can also comprise other control querying command.The embodiment of the present invention only is described for read-write requests, after the described scsi command of step 303 judgement is not write request, also needs to judge whether described scsi command is read request.
Step 307, network interface card are submitted to and have been write response message to described server, and said write completes response message and comprises described the first data.Execution step 317.
Due in step 302, the first data that network interface card judgement cache module does not exist scsi command to access, the i.e. miss buffer memory of the first data, and be write request because step 306 network interface card judges described scsi command, need to open up new spatial cache so that the storage of the first data.
Step 311, network interface card write described new spatial cache by described the first data.Execution step 312.
Due in step 302, the first data that network interface card judgement cache module does not exist scsi command to access, i.e. the miss buffer memory of the first data, and step 306 network interface card judges that described scsi command is read request, because there are not the first data in cache module, therefore the first data need to be obtained from IP-SAN.
Concrete, described read request can be encapsulated as to an iSCSI protocol massages.Then a described iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN returns to the first data that a described iSCSI protocol massages is accessed; Then, receive described the first data that described IP-SAN sends.Execution step 310.
Due to the first data are carried out to buffer memory, in follow-up read request or write request process, if the data of access are the first data, network interface card can directly be read or write activity in cache module, simplify the process of data access, thereby reduced network delay, improved data access speed.
It should be noted that, in actual applications, may be due to the reasons such as damage of hardware device, the data access failure, now, network interface card can return and read failure response information or write failure response information.
Because the spatial cache of cache module is limited, mainly can preserve and use data frequently, all data of storage that need finally also should be stored to IP-SAN, so network interface card need to be stored to IP-SAN again by the first data, to keep the data consistency of cache module and IP-SAN.
Concrete, described write request can be encapsulated as to the 5th iSCSI protocol massages.Then described the 5th iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN is to the data in described the 5th iSCSI protocol massages, the first data are stored.Execution step 317.
In order to guarantee the data consistency of cache module and IP-SAN, need to be processed the dirty page data in cache module.It should be noted that, when usining page during as the unit of the high-speed cache in cache module, if system has been revised the data in the high-speed cache, the residing page of the data that are modified just is marked as dirty page data.Network interface card can be by judging whether dirty page data total capacity is greater than the first preset capacity threshold value, dirty page data and whether is greater than very first time threshold value or the no processing that exists the flush buffers instruction to carry out dirty page data memory time.
Example, when network interface card carries out the processing of dirty page data according to dirty page data total capacity, at first can judge whether the total capacity of the dirty page data of described cache module is greater than the first capacity threshold; When the total capacity of the dirty page data of described cache module is greater than the first capacity threshold, the dirty page data of described cache module is packaged into to the 2nd iSCSI protocol massages; Then described the 2nd iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN is stored the data of described second protocol message transmissions.It should be noted that, described the first capacity threshold is for limiting described dirty page data taking up room at described cache module, can set in advance according to the concrete structure of network interface card, usually relevant to the overall storage capacity of cache module, preferably, the ratio of the overall storage capacity of described the first capacity threshold and described cache module is more than or equal to 70 percent, is less than or equal to 90 percent.Dirty page data in described the 2nd iSCSI protocol massages is generally all dirty page data in described cache module, and described dirty page data processing procedure is generally periodic.
When network interface card, according to flush buffers, the processing of dirty page data is carried out in instruction, the flush buffers instruction at first can reception server sent; Then according to described flush buffers instruction, the dirty page data of described cache module is packaged into to the 3rd iSCSI protocol massages; Finally described the 3rd iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN is stored the data of described the 3rd protocol massages transmission.The described first dirty page data can be one or more dirty page datas, and described flush buffers instruction indicates server to send by the user.The flush buffers instruction that network interface card can send according to server like this is updated to IP-SAN by the dirty page data in cache module in real time, guarantees the data consistency of cache module and IP-SAN.
When network interface card carries out the processing of dirty page data according to dirty page data memory time, whether be greater than the very first time threshold value memory time that at first can judge the dirty page data of described cache module; While having the first dirty page data that is greater than the very first time threshold value memory time in described cache module, the described first dirty page data is packaged into to the 4th iSCSI protocol massages; Then described the 4th iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN is stored the data of described the 4th protocol massages transmission.It should be noted that, described very first time threshold value is preset value, and for limiting described dirty page data in the memory time of described cache module, described very first time threshold value is the time threshold that preset value is generally millisecond (ms) or second (s) level, example, as 5s, 10s etc.Described dirty page data processing procedure is generally periodic.
In actual applications, network interface card can judge whether dirty page data total capacity is greater than the first preset capacity threshold value, whether dirty page data is greater than very first time threshold value and whether exists the flush buffers instruction to carry out the processing of dirty page data memory time simultaneously, when above-mentioned any one situation reaches satisfied, be the corresponding processing of carrying out dirty page data, can effectively guarantee like this data consistency of cache module and IP-SAN.
Especially; the sequencing of the data access method step that the embodiment of the present invention provides can suitably be adjusted; step also can according to circumstances be carried out corresponding increase and decrease; for example; do not limit the execution sequence of step 303 and step 305; do not limit the execution sequence of step 308 and step 310; do not limit the execution sequence of step 316 and step 317; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily the method changed; within all should being encompassed in protection scope of the present invention, therefore repeat no more.
In the data access method that the embodiment of the present invention provides, cache module is set in network interface card, when server transmission scsi command is accessed the first data, first judge in cache module and whether have described the first data, according to judged result, described the first data are carried out to caching process, after caching process, just can return to response message to described server.Compared to prior art, the data access process is just responded the data access of server through the IP-SAN corresponding operating after processing at network interface card again, therefore simplified the process of data access, just can return to response signal after at network interface card, carrying out caching process, thereby reduce the network delay of the data access between server and IP-SAN, improve data access speed.
The embodiment of the present invention provides a kind of network interface card 40, as shown in Figure 4, be provided with iSCSI protocol process module 401 and cache module 402 in described network interface card 40, described cache module 402 need to be stored to the data of storage area network IP-SAN for caching server, and described network interface card also comprises:
The first judging unit 403, for the first data that judge that described cache module 402 scsi command whether presence server sends is accessed, described scsi command is for reading instruction or write command, and described the first judging unit 403 can be realized by the processor of network interface card 40.
Described processing unit 404 specifically for:
If there are described the first data in described cache module, and described scsi command is write request, by described the first Data Update to described cache module.
If there are not described the first data in described cache module, and described scsi command is write request, and described the first data are write to described cache module.
If there are described the first data in described cache module, and described scsi command is read request, from described cache module, reads described the first data.
If there are not described the first data in described cache module, and described scsi command is read request, described read request is encapsulated as to an iSCSI protocol massages, a described iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN returns to the first data that a described iSCSI protocol massages is accessed, receive described the first data that described IP-SAN sends, described the first data are submitted to server, at described cache module, described the first data are carried out to buffer memory.
So, cache module is set in network interface card, when server transmission scsi command is accessed the first data, the first judging unit first judges in cache module whether have described the first data, processing unit is according to judged result, described the first data are carried out to caching process, and response unit just can return to response message to described server after caching process.Compared to prior art, the data access process is just responded the data access of server through the IP-SAN corresponding operating after processing at network interface card again, therefore simplified the process of data access, just can return to response signal after at network interface card, carrying out caching process, thereby reduce the network delay of the data access between server and IP-SAN, improve data access speed.
Further, as shown in Figure 5, described network interface card 40 can also comprise:
Whether the second judging unit 406, be greater than the first capacity threshold for the total capacity of the dirty page data that judges described cache module, and described the first capacity threshold is for limiting described dirty page data taking up room at described cache module;
The first encapsulation unit 407, while for the total capacity of the dirty page data at described cache module, being greater than the first capacity threshold, be packaged into the 2nd iSCSI protocol massages by the dirty page data of described cache module;
The first transmitting element 408, for described the 2nd iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN is stored the data of described second protocol message transmissions.
As shown in Figure 6, described network interface card 40 can also comprise:
Receiving element 409, the flush buffers instruction sent for reception server.
The second encapsulation unit 410, for according to described flush buffers instruction, be packaged into the 3rd iSCSI protocol massages by the dirty page data of described cache module.
The second transmitting element 411, for described the 3rd iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN is stored the data of described the 3rd protocol massages transmission.
As shown in Figure 7, described network interface card 40 can also comprise:
The 3rd judging unit 412, for whether being greater than memory time of the dirty page data that judges described cache module very first time threshold value, described very first time threshold value is for limiting the memory time of described dirty page data at described cache module.
The 3rd encapsulation unit 413, for when there is the first dirty page data that is greater than the very first time threshold value memory time in described cache module, be packaged into the 4th iSCSI protocol massages by the described first dirty page data.
The 3rd transmitting element 414, for described the 4th iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN is stored the data of described the 4th protocol massages transmission.
It should be noted that, described cache module 401 can be non-volatile memory medium: the magnetic internal memory, as STT RAM, or phase transition internal memory, as PCM, using magnetic internal memory or phase transition internal memory as the storage medium of cache module, can realize very desirable data access time delay, and the not obliterated data that cuts off the power supply, guaranteed the data consistency of cache module and IP-SAN.
The embodiment of the present invention provides a kind of storage system, comprise: the described network interface card of any embodiment of the present invention, be provided with Internet Small Computer Systems Interface iSCSI protocol process module and cache module in described network interface card, described cache module need to be stored to the data of storage area network IP-SAN for caching server, described network interface card is used for: judge the first data that the described cache module scsi command whether presence server sends is accessed, described scsi command is for reading instruction or write command; According to judged result, between described server and described IP-SAN, described the first data are carried out to caching process; And IP-SAN and server.In the structure of described storage system, the software architecture diagram of each device can be with reference to figure 1.
Described according to judged result, between described server and described IP-SAN, described the first data being carried out to caching process comprises: if there are described the first data in described cache module, and described scsi command is write request, by described the first Data Update to described cache module; If there are not described the first data in described cache module, and described scsi command is write request, and described the first data are write to described cache module; If there are described the first data in described cache module, and described scsi command is read request, from described cache module, reads described the first data; If there are not described the first data in described cache module, and described scsi command is read request, described read request is encapsulated as to an iSCSI protocol massages, a described iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN returns to the first data that a described iSCSI protocol massages is accessed, receive described the first data that described IP-SAN sends, described the first data are submitted to server, at described cache module, described the first data are carried out to buffer memory.
Described cache module is magnetic internal memory or phase transition internal memory.
The embodiment of the present invention provides a kind of network interface card 50, as shown in Figure 8, be provided with iSCSI protocol process module 501 and cache module 502 in described network interface card 50, described cache module 502 need to be stored to the data of storage area network IP-SAN for caching server, described cache module 502 can be non-volatile memory medium: the magnetic internal memory, as STT RAM, or phase transition internal memory, as PCM, using magnetic internal memory or the phase transition internal memory storage medium as cache module, can realize very desirable data access time delay, and not obliterated data cuts off the power supply, guaranteed the data consistency of cache module and IP-SAN.Described network interface card 50 comprises:
PCIE (Peripheral Component Interconnect Express, Peripheral Component Interconnect standard) interface 504, can be for returning to response message to described server.
So, cache module is set in network interface card, when processor is accessed the first data at server transmission scsi command, first judge in cache module and whether have described the first data, according to judged result, described the first data are carried out to caching process, and the PCIE interface just can return to response message to described server after caching process.Compared to prior art, the data access process is just responded the data access of server through the IP-SAN corresponding operating after processing at network interface card again, therefore simplified the process of data access, just can return to response signal after at network interface card, carrying out caching process, thereby reduce the network delay of the data access between server and IP-SAN, improve data access speed.
If also there are described the first data in described processor 503 for described cache module, and described scsi command is write request, by described the first Data Update to described cache module; If there are not described the first data in described cache module, and described scsi command is write request, and described the first data are write to described cache module; If there are described the first data in described cache module, and described scsi command is read request, from described cache module, reads described the first data; If there are not described the first data in described cache module, and described scsi command is read request, and described read request is encapsulated as to an iSCSI protocol massages.
As shown in Figure 9, described network interface card 50 also comprises:
Described PCIE interface 504 can also be for submitting to server by described the first data.
Described cache module 502, can be for carrying out buffer memory at described cache module to described the first data.
Described processor 503 can also for: whether the total capacity that judges the dirty page data of described cache module is greater than the first capacity threshold, and described the first capacity threshold is for limiting described dirty page data taking up room at described cache module; When the total capacity of the dirty page data of described cache module is greater than the first capacity threshold, the dirty page data of described cache module is packaged into to the 2nd iSCSI protocol massages.
Described network interface 505 can also be for described the 2nd iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN is stored the data of described second protocol message transmissions.
The flush buffers instruction that described PCIE interface 504 can also send for reception server.And transmit the flush buffers instruction to described processor 503, after described processor 503 receives instruction, can also, for according to described flush buffers instruction, the dirty page data of described cache module be packaged into to the 3rd iSCSI protocol massages.Then, described network interface 504 can also be for described the 3rd iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN is stored the data of described the 3rd protocol massages transmission.
Whether described processor 503 can also be greater than for the memory time of the dirty page data that judges described cache module very first time threshold value, and described very first time threshold value is for limiting the memory time of described dirty page data at described cache module; While having the first dirty page data that is greater than the very first time threshold value memory time in described cache module, the described first dirty page data is packaged into to the 4th iSCSI protocol massages.
Described network interface 505 can also be for being sent to described IP-SAN by described the 4th iSCSI protocol massages, so that described IP-SAN is stored the described first dirty page data.
The those skilled in the art can be well understood to, for convenience and simplicity of description, the system of foregoing description, the specific works process of device and unit, can, with reference to the corresponding process in preceding method embodiment, not repeat them here.
In the several embodiment that provide in the application, should be understood that, disclosed system, apparatus and method, can realize by another way.For example, device embodiment described above is only schematic, for example, the division of described unit, be only that a kind of logic function is divided, during actual the realization, other dividing mode can be arranged, for example a plurality of unit or assembly can in conjunction with or can be integrated into another system, or some features can ignore, or do not carry out.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, indirect coupling or the communication connection of device or unit can be electrically, machinery or other form.
The described unit as the separating component explanation can or can not be also physically to separate, and the parts that show as unit can be or can not be also physical locations, can be positioned at a place, or also can be distributed on a plurality of network element.Can select according to the actual needs some or all of unit wherein to realize the purpose of the present embodiment scheme.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, can be also that the independent physics of unit comprises, also can be integrated in a unit two or more unit.Above-mentioned integrated unit both can adopt the form of hardware to realize, the form that also can adopt hardware to add SFU software functional unit realizes.
One of ordinary skill in the art will appreciate that: realize that the hardware that all or part of step of said method embodiment can be relevant by program command completes, aforesaid program can be stored in a computer read/write memory medium, this program, when carrying out, is carried out the step that comprises said method embodiment; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CDs.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (15)
1. a data access method, be applied to network interface card, it is characterized in that, be provided with Internet Small Computer Systems Interface iSCSI protocol process module and cache module in described network interface card, described cache module need to be stored to the data of storage area network IP-SAN for caching server, and described method comprises:
Judge the first data that the described cache module scsi command whether presence server sends is accessed, described scsi command is for reading instruction or write command;
According to judged result, between described server and described IP-SAN, described the first data are carried out to caching process;
Return to response message to described server.
2. method according to claim 1, is characterized in that, described according to judged result, between described server and described IP-SAN, described the first data carried out to caching process and comprise:
If there are described the first data in described cache module, and described scsi command is write request, by described the first Data Update to described cache module;
If there are not described the first data in described cache module, and described scsi command is write request, and described the first data are write to described cache module;
If there are described the first data in described cache module, and described scsi command is read request, from described cache module, reads described the first data;
If there are not described the first data in described cache module, and described scsi command is read request, and described read request is encapsulated as to an iSCSI protocol massages,
A described iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN returns to the first data that a described iSCSI protocol massages is accessed,
Receive described the first data that described IP-SAN sends,
Described the first data are submitted to server,
At described cache module, described the first data are carried out to buffer memory.
3. method according to claim 1 and 2, is characterized in that, described cache module is magnetic internal memory or phase transition internal memory.
4. according to the described method of claims 1 to 3 any one claim, it is characterized in that, described method also comprises:
Whether the total capacity that judges the dirty page data of cache module is greater than the first capacity threshold, and described the first capacity threshold is for limiting described dirty page data taking up room at described cache module;
When the total capacity of the dirty page data of described cache module is greater than the first capacity threshold, the dirty page data of described cache module is packaged into to the 2nd iSCSI protocol massages;
Described the 2nd iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN is stored the data of described second protocol message transmissions.
5. according to the described method of claims 1 to 3 any one claim, it is characterized in that, described method also comprises:
The flush buffers instruction that reception server sends;
According to described flush buffers instruction, the dirty page data of cache module is packaged into to the 3rd iSCSI protocol massages;
Described the 3rd iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN is stored the data of described the 3rd protocol massages transmission.
6. according to the described method of claims 1 to 3 any one claim, it is characterized in that, described method also comprises:
Whether be greater than the very first time threshold value memory time that judges the dirty page data of cache module, described very first time threshold value is for limiting the memory time of described dirty page data at described cache module;
While having the first dirty page data that is greater than the very first time threshold value memory time in described cache module, the described first dirty page data is packaged into to the 4th iSCSI protocol massages;
Described the 4th iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN is stored the data of described the 4th protocol massages transmission.
7. a network interface card, it is characterized in that, be provided with Internet Small Computer Systems Interface iSCSI protocol process module and cache module in described network interface card, described cache module need to be stored to the data of storage area network IP-SAN for caching server, and described network interface card also comprises:
The first judging unit, for the first data that judge that the described cache module scsi command whether presence server sends is accessed, described scsi command is for reading instruction or write command;
Processing unit for according to judged result, carries out caching process to described the first data between described server and described IP-SAN;
Response unit, for returning to response message to described server.
8. network interface card according to claim 7, is characterized in that, described processing unit specifically for:
If there are described the first data in described cache module, and described scsi command is write request, by described the first Data Update to described cache module;
If there are not described the first data in described cache module, and described scsi command is write request, and described the first data are write to described cache module;
If there are described the first data in described cache module, and described scsi command is read request, from described cache module, reads described the first data;
If there are not described the first data in described cache module, and described scsi command is read request, and described read request is encapsulated as to an iSCSI protocol massages,
A described iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN returns to the first data that a described iSCSI protocol massages is accessed,
Receive described the first data that described IP-SAN sends,
Described the first data are submitted to server,
At described cache module, described the first data are carried out to buffer memory.
9. according to the described network interface card of claim 7 or 8, it is characterized in that, described cache module is magnetic internal memory or phase transition internal memory.
10. according to the described network interface card of claim 7 to 9 any one claim, it is characterized in that, described network interface card also comprises:
Whether the second judging unit, be greater than the first capacity threshold for the total capacity of the dirty page data that judges cache module, and described the first capacity threshold is for limiting described dirty page data taking up room at described cache module;
The first encapsulation unit, while for the total capacity of the dirty page data at described cache module, being greater than the first capacity threshold, be packaged into the 2nd iSCSI protocol massages by the dirty page data of described cache module;
The first transmitting element, for described the 2nd iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN is stored the data of described second protocol message transmissions.
11. according to the described network interface card of claim 7 to 9 any one claim, it is characterized in that, described network interface card also comprises:
Receiving element, the flush buffers instruction sent for reception server;
The second encapsulation unit, for according to described flush buffers instruction, be packaged into the 3rd iSCSI protocol massages by the dirty page data of cache module;
The second transmitting element, for described the 3rd iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN is stored the data of described the 3rd protocol massages transmission.
12. according to the described network interface card of claim 7 to 9 any one claim, it is characterized in that, described network interface card also comprises:
The 3rd judging unit, for whether being greater than memory time of the dirty page data that judges cache module very first time threshold value, described very first time threshold value is for limiting the memory time of described dirty page data at described cache module;
The 3rd encapsulation unit, for when there is the first dirty page data that is greater than the very first time threshold value memory time in described cache module, be packaged into the 4th iSCSI protocol massages by the described first dirty page data;
The 3rd transmitting element, for described the 4th iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN is stored the data of described the 4th protocol massages transmission.
13. a storage system, is characterized in that, comprising:
Network interface card, be provided with Internet Small Computer Systems Interface iSCSI protocol process module and cache module in described network interface card, described cache module need to be stored to the data of storage area network IP-SAN for caching server, described network interface card is used for: judge the first data that the described cache module scsi command whether presence server sends is accessed, described scsi command is for reading instruction or write command; According to judged result, between described server and described IP-SAN, described the first data are carried out to caching process;
And IP-SAN and server.
14. storage system according to claim 13, is characterized in that,
Described according to judged result, between described server and described IP-SAN, described the first data are carried out to caching process and comprise:
If there are described the first data in described cache module, and described scsi command is write request, by described the first Data Update to described cache module;
If there are not described the first data in described cache module, and described scsi command is write request, and described the first data are write to described cache module;
If there are described the first data in described cache module, and described scsi command is read request, from described cache module, reads described the first data;
If there are not described the first data in described cache module, and described scsi command is read request, and described read request is encapsulated as to an iSCSI protocol massages,
A described iSCSI protocol massages is sent to described IP-SAN, so that described IP-SAN returns to the first data that a described iSCSI protocol massages is accessed,
Receive described the first data that described IP-SAN sends,
Described the first data are submitted to server,
At described cache module, described the first data are carried out to buffer memory.
15. according to the described storage system of claim 13 or 14, it is characterized in that,
Described cache module is magnetic internal memory or phase transition internal memory.
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