CN113849126A - Log storage method and device - Google Patents
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- 238000005192 partition Methods 0.000 description 2
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/0604—Improving or facilitating administration, e.g. storage management
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/10—File systems; File servers
- G06F16/17—Details of further file system functions
- G06F16/1734—Details of monitoring file system events, e.g. by the use of hooks, filter drivers, logs
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0646—Horizontal data movement in storage systems, i.e. moving data in between storage devices or systems
- G06F3/065—Replication mechanisms
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
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- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
- G06F3/067—Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]
Abstract
The embodiment of the application discloses a storage method and a storage device for LUN mirror image logs. The storage method of the LUN mirror log comprises the following steps: and the equipment records the received log for writing data into the LUN mirror image in a memory during normal operation, and writes the log record into the hard disk when the equipment is shut down. The technical scheme provided by the application can solve the problems of tedious and low efficiency of the LUN mirror image log recording mode, and improve the performance of the whole mirror image LUN.
Description
Technical Field
The present application relates to the field of network storage technologies, and in particular, to a log storage method and apparatus.
Background
In a storage Area network san (storage Area network), a storage system partitions a physical hard disk into portions having logical addresses, and further allows a host to access the portions, and such a partition is referred to as a logical Unit number lun (logical Unit number). A LUN, as it is commonly referred to, also refers to a logical disk created on SAN storage. In order to protect the security of data on the LUN, the LUN is usually mirrored, which is called LUN mirroring. The LUN mirroring function is a logical volume in which a pair of data in a target end in a storage area network are mirrored, and the logical volume in which the pair of data are mirrored is also referred to as a mirror pair. And the LUN requiring the data mirroring function is called a mirror source LUN.
In a storage area network, when an initiating terminal performs write data operation on an LUN mirror image, a mirror image log executes two steps: 1. when writing is started, the mirror image log records data inconsistency between the mirror image pairs at the current writing position; 2. and when the mirror image pairs are successfully written, the mirror image log records that the data between the mirror image pairs are consistent. This results in two logs being generated when data is newly written. In the prior art, logs are synchronously written into a hard disk every time, and the performance of the whole storage system is too low due to frequent writing of the logs into the hard disk.
Disclosure of Invention
In order to solve the above problems, the present invention provides a log storage method and apparatus, so as to implement synchronous writing to a hard disk without generating a log each time, and improve the performance of the whole storage system.
The technical scheme is as follows:
a log storage method is applied to a first controller in a storage server, and comprises the following steps:
when monitoring a mirror image log generated in the process of executing operation on a target logic unit number LUN, the first controller temporarily stores the monitored mirror image log into a first memory associated with the first controller; and the target LUN is a LUN of which the data needs a mirroring function.
When the first controller detects a hard disk storage event, if the first memory stores mirror image logs, all the mirror image logs stored in the specified memory are stored in a first hard disk associated with the first controller.
A log storage apparatus applied to a first controller in a storage server, the apparatus comprising:
a memory storage unit: when monitoring a mirror image log generated in the process of executing operation on a target logic unit number LUN, the first controller temporarily stores the monitored mirror image log into a first memory associated with the first controller; the target LUN is an LUN of which data needs a mirror image function;
hard disk storage unit: and when the first controller detects a hard disk storage event, if the first memory stores mirror image logs, storing all the mirror image logs stored in the specified memory to the first hard disk associated with the first controller.
According to the technical scheme, in the embodiment, the log is temporarily stored in the designated memory, and the log is stored in the hard disk when a hard disk storage event is detected, so that the problem that the log is synchronously written in the hard disk every time in the prior art is solved, and the performance of the storage system is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1 is a schematic flow chart diagram illustrating an embodiment of a log storage method of the present application;
FIG. 2 is a block diagram of the controller of the present application;
FIG. 3 is a schematic flow chart diagram illustrating another embodiment of a log storage method of the present application;
FIG. 4 is a schematic flow chart diagram illustrating another embodiment of a log storage method of the present application;
FIG. 5 is a schematic flow chart diagram illustrating another embodiment of a log storage method of the present application;
FIG. 6 is a flow chart of the present application in which two controllers determine an access request;
FIG. 7 is a schematic diagram of a log storage device according to the present application;
FIG. 8 is a schematic diagram of another embodiment of a log storage device according to the present application;
fig. 9 is another schematic structural diagram of the log storage apparatus according to the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments that can be derived from the embodiments given herein by a person of ordinary skill in the art are intended to be within the scope of the present disclosure.
Some of the related concepts related to the present application will be first introduced:
LUN mirroring function: a pair of data in a target end in a storage local area network are mirror image logical volumes.
Mirror image source LUN: LUNs for data mirroring functions are required.
Mirror image copy: and the LUN mirroring function is a logical volume which provides a mirroring function for the LUN of the mirroring source.
For a mirror pair: a logical volume that mirrors the source LUN and a logical volume that mirrors the copy.
The double-control storage array comprises: the storage array composed of a group of dual redundant controllers which are mutually backed up can be used as a target end in a storage local area network.
Single control exception: in the double-control storage array, when one controller is abnormal and cannot provide service continuously, the other controller can take over the service.
Mirror synchronization: and performing data consistency operation between the mirror source LUN and the mirror copy.
PCI express (peripheral component interconnect express) is a high-speed serial computer expansion bus, and connected devices allocate an independent channel bandwidth and do not share a bus bandwidth.
The NTB is Non-Transparent Bridge, which can realize the direct communication between two mainboards (processors) with independent IO/Memory domains.
The log storage method is provided based on the point that the log is temporarily stored in the memory, so that the problem that the log is synchronously written to the hard disk when being generated every time is solved. Referring to fig. 1, the method applied to a first controller in a storage server may include the following steps:
s101, when monitoring a mirror image log generated in the process of executing operation on a target logic unit number LUN, a first controller temporarily stores the monitored mirror image log into a first memory associated with the first controller; and the target LUN is a LUN of which the data needs a mirroring function.
In this embodiment, the controller structure is as shown in fig. 2, and the controller at least includes a memory, a built-in SSD hard disk, a built-in battery, a power connection port, and a CPU.
As described in step S101, when the controller monitors the mirror log generated during the operation performed on the target logical unit number LUN, the controller temporarily stores the monitored mirror log into the first memory associated with the first controller, where the first memory may be a memory of the controller.
In this embodiment, the mirror log is used to record the status of each LUN, for example, a 0 record indicates that the data written into the mirror pair is consistent, and a 1 record indicates that the data written into the mirror pair is inconsistent. Therefore, each time the mirror log is generated during the operation of the LUN, only the state value of each LUN recorded in the log is actually modified, and the file size of the log is not changed.
S102, when a hard disk storage event is detected, if the first memory stores mirror image logs, the first controller stores all the mirror image logs stored in the specified memory to the first hard disk associated with the first controller.
In this embodiment, there may be many hard disk storage events in step S102, for example, the controller receives a shutdown command. For another example, the controller receives a client-initiated save instruction. And so on, this embodiment will not be described by way of example. In this embodiment, the first hard disk associated with the first control may be a built-in SSD hard disk of the controller.
In another embodiment, the storing all the image logs stored in the designated memory to the first hard disk associated with the first control further includes:
when the hard disk storage event is identified as that the storage server is shut down due to power failure, all the mirror image logs stored in the specified memory are stored in the first hard disk associated with the first control through the work of a built-in power supply unit. Specifically, when sudden power failure occurs, all mirror image logs stored in the specified memory are stored in an SSD hard disk built in the controller through a built-in battery on the controller.
Thus, the flow shown in fig. 1 is completed.
As can be seen by the flow shown in fig. 1:
in the embodiment, the log is temporarily stored in the memory of the controller, and the log is stored in the hard disk when a hard disk storage event is detected, so that the problem that the log is synchronously written in the hard disk every time the log is generated is solved. In addition, the above another embodiment further provides an abnormal power-off protection function, so that even if an abnormal power-off condition occurs, the log can be stored in the hard disk, and the security of temporarily storing the log in the memory of the controller is ensured.
In another embodiment of the application, the log in the SSD hard disk can be read and stored again in the memory, which is convenient for using the log.
Referring to fig. 3, a flowchart of another embodiment of a log storage method according to the present application includes the following steps:
the descriptions of S301 to S302 may refer to the corresponding descriptions of S101 to S102 in fig. 1, and are not repeated here.
S303, when detecting a log reading event, the first controller reads all mirror image logs stored in the first hard disk from the first hard disk;
and temporarily storing all the read mirror image logs into the first memory.
In this embodiment, there may be many log reading events, such as a boot instruction, specifically, after the controller detects the boot instruction, all stored mirror image logs are read from the SSD hard disk built in the controller, and then the read mirror image logs are temporarily stored in the memory of the controller, so that the controller is convenient to use. The log read event may also be a log read command sent by the client. And so on, this embodiment will not be described by way of example.
The flow shown in fig. 3 is completed.
In this embodiment, the log is temporarily stored in the designated memory, the log is stored in the SSD hard disk built in the controller only when a hard disk storage event is detected, and the log is read from the SSD hard disk into the memory when a log reading event is detected. This solves the problem that each time the log is generated, the log is written to the hard disk synchronously.
In another embodiment of the present application, the storage server further comprises at least one second controller configured to be linked with the first controller, as shown in fig. 4, and the method further comprises:
s401, when the first controller temporarily stores the monitored mirror image log into a first memory associated with the first controller, the first controller sends the monitored mirror image log to a second controller linked with the first controller, so that the second controller stores the received mirror image log into an associated second memory.
In this embodiment, there are many methods for sending the monitored mirror image log to the second controller linked with the first controller, for example, taking two controllers as an example, the two controllers are connected by a PCIE bus and an NTB technology, so as to implement a dual-control storage array function, enable the two controllers to share a channel bandwidth exclusively, and enable the log not to reduce the overall performance of the storage server in frequent transmission. The method of the second controller in which the first controller is linked is not particularly limited in this embodiment.
The descriptions of S402-S403 may refer to the corresponding descriptions of S303-S304 in fig. 3, and are not repeated here.
The flow shown in fig. 4 is completed.
In this embodiment, by the method of synchronously storing the logs among the plurality of controllers, when one of the controllers is abnormal, the other controller takes over control through the dual-control storage array function, and the logs can still be temporarily stored in the designated memory, so that the security of temporarily storing the logs in the memory of the controller is ensured. In the embodiment, the log is temporarily stored in the designated memory, and the log is stored in the SSD hard disk built in the controller only when the hard disk storage event is detected, so that the problem that the log is synchronously written in the SSD every time the log is generated is solved. When the controller is abnormal, it is not the point of the present application that another controller takes over control through the dual-control storage array function, and the description thereof is not repeated here.
It should be noted that, in practical use, the above embodiment may configure the access policy at the host side, for example, configure that all operation requests are sent to the first controller, or the second controller, so that when the LUN of the access request is not the LUN associated with the accessed controller, the controller needing to be accessed sends the access request to the other controller, as described below.
In another embodiment, as shown in figure 5,
s501, when the LUN to be accessed by the LUN access request is not the LUN associated with the first controller, sending the LUN access request to a second controller associated with the LUN to be accessed by the LUN access request; in this embodiment, there are many methods for determining that the LUN to be accessed by the access request is not the LUN associated with the first controller, and the number of controllers is 2 to illustrate the implementation manner, as shown in fig. 6, the execution operation request carries a LUN identifier for recording the controller associated with the LUN; when the controller monitors that the operation is executed on the target LUN, detecting whether the LUN identification of the LUN of the executed operation is related to the controller, and if not, sending the executed operation to a second controller.
S502 receives the mirror image log sent by the second controller, and stores the mirror image log to the associated first memory.
The descriptions of S503 to S504 may refer to the corresponding descriptions of S302 to S303 in fig. 3, and are not repeated here.
The flow shown in fig. 5 is completed.
In this embodiment, by using the method of forwarding the access request by the controller, the storage server can receive the access request by using only one controller, so that logs are synchronously stored among a plurality of controllers, and when a hard disk storage event is detected, the logs are stored in the SSD hard disk function built in the controller, thereby solving the problem that the logs are synchronously written in the hard disk every time the logs are generated.
Corresponding to the above method embodiment, the present application further provides a log storage apparatus, applied to a first controller on a storage server, and as shown in fig. 7, the apparatus may include:
memory storage unit 710: when monitoring a mirror image log generated in the process of executing operation on a target logic unit number LUN, the first controller temporarily stores the monitored mirror image log into a first memory associated with the first controller; the target LUN is an LUN of which data needs a mirror image function;
hard disk storage unit 720: and when the first controller detects a hard disk storage event, if the first memory stores mirror image logs, storing all the mirror image logs stored in the specified memory to the first hard disk associated with the first controller.
In an embodiment of the present application, when the memory storage unit 710 monitors a mirror image log generated during an operation performed on a target logical unit number LUN, the monitored mirror image log is temporarily stored in a first memory associated with a first controller, and when the hard disk storage unit 720 detects a hard disk storage event, if the first memory stores a mirror image log, all mirror image logs stored in the specified memory are stored in a first hard disk associated with the first controller.
In another embodiment, as shown in fig. 8, the apparatus may further include:
a log reading unit 730, configured to, when the first controller detects a log reading event, read all mirror image logs stored in the first hard disk from the first hard disk; and temporarily storing all the read mirror image logs into the first memory.
In another embodiment, as shown in fig. 9, the apparatus may further include:
access request forwarding unit 740: determining that the LUN to be accessed by the LUN access request is not the LUN associated with the first controller, and sending the LUN access request to a second controller associated with the LUN to be accessed by the LUN access request;
log transmission unit 750: the first controller further comprises, in temporarily storing the monitored mirror log in a first memory associated with the first controller: and sending the monitored mirror image log to a second controller linked with the first controller. So that the second controller stores the received image log to the associated second memory.
Reception storage unit 760: for receiving the image log and storing the received image log to an associated memory.
The implementation process of the functions and actions of each unit in the above device is specifically described in the implementation process of the corresponding step in the above method, and is not described herein again.
From the above description of the embodiments, it is clear to those skilled in the art that the present application can be implemented by software plus necessary general hardware platform. Based on such understanding, the technical solutions of the present application may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments of the present application.
While this specification contains many specific implementation details, these should not be construed as limitations on the scope of any invention or of what may be claimed, but rather as descriptions of features specific to particular embodiments of particular inventions. Certain features that are described in this specification in the context of separate embodiments can also be implemented in combination in a single embodiment. In other instances, features described in connection with one embodiment may be implemented as discrete components or in any suitable subcombination. Moreover, although features may be described above as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination can in some cases be excised from the combination, and the claimed combination may be directed to a subcombination or variation of a subcombination.
Similarly, while operations are depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In some cases, multitasking and parallel processing may be advantageous. Moreover, the separation of various system modules and components in the embodiments described above should not be understood as requiring such separation in all embodiments, and it should be understood that the described program components and systems can generally be integrated together in a single software product or packaged into multiple software products.
Thus, particular embodiments of the subject matter have been described. Other embodiments are within the scope of the following claims. In some cases, the actions recited in the claims can be performed in a different order and still achieve desirable results. Further, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some implementations, multitasking and parallel processing may be advantageous.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.
Claims (10)
1. A log storage method is applied to a first controller in a storage server, and comprises the following steps:
when monitoring a mirror image log generated in the process of executing operation on a target logic unit number LUN, the first controller temporarily stores the monitored mirror image log into a first memory associated with the first controller; the target LUN is an LUN of which data needs a mirror image function;
when the first controller detects a hard disk storage event, if the first memory stores mirror image logs, all the mirror image logs stored in the specified memory are stored in the first hard disk associated with the first controller.
2. The method of claim 1, wherein the hard disk storage event comprises at least the storage server being powered down.
3. The method according to claim 1 or 2, characterized in that the method further comprises:
when detecting a log reading event, the first controller reads all mirror image logs stored in the first hard disk from the first hard disk;
and temporarily storing all the read mirror image logs into the first memory.
4. The method of claim 3, wherein the log read event is the storage server being turned on.
5. The method of claim 1 or 2, wherein storing all mirror logs of the specified memory storage to the first hard disk associated with the first control further comprises:
when the hard disk storage event is identified as that the storage server is shut down due to power failure, all the mirror image logs stored in the specified memory are stored in the first hard disk associated with the first control through the work of a built-in power supply unit.
6. The method of claim 1, wherein the storage server further comprises at least one second controller; the second controller is configured to be interlocked with the first controller;
the first controller further includes, in temporarily storing the monitored mirror log in a first memory associated with the first controller: and sending the monitored mirror image log to a second controller linked with the first controller so as to enable the second controller to store the received mirror image log to a second associated memory.
7. The method according to claim 6, wherein the target logical unit number LUN is a LUN associated with the first controller to be accessed by a LUN access request received by the first controller;
the method further comprises the following steps:
when the LUN to be accessed by the LUN access request is not the LUN associated with the first controller, sending the LUN access request to a second controller associated with the LUN to be accessed by the LUN access request;
receiving a mirror image log sent by a second controller;
and storing the mirror image log to an associated first memory.
8. A log storage apparatus applied to a first controller in a storage server, the apparatus comprising:
a memory storage unit: when monitoring a mirror image log generated in the process of executing operation on a target logic unit number LUN, the first controller temporarily stores the monitored mirror image log into a first memory associated with the first controller; the target LUN is an LUN of which data needs a mirror image function;
hard disk storage unit: and when the first controller detects a hard disk storage event, if the first memory stores mirror image logs, storing all the mirror image logs stored in the specified memory to the first hard disk associated with the first controller.
9. The apparatus of claim 8, further comprising:
a log reading unit: the first controller is used for reading all mirror image logs stored in the first hard disk from the first hard disk when a log reading event is detected;
and temporarily storing all the read mirror image logs into the first memory.
10. The apparatus of claim 8, wherein the storage server further comprises at least one second controller; the second controller is configured to be interlocked with the first controller; the device also includes:
an access request forwarding unit: determining that the LUN to be accessed by the LUN access request is not the LUN associated with the first controller, and sending the LUN access request to a second controller associated with the LUN to be accessed by the LUN access request;
a log transmission unit: the first controller further comprises, in temporarily storing the monitored mirror log in a first memory associated with the first controller: sending the monitored mirror image log to a second controller linked with the first controller so that the second controller stores the received mirror image log to a second associated memory;
a receiving storage unit: for receiving the image log and storing the received image log to an associated memory.
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