CN101448022A - Control method of system interface iSCSI receiving end window of internet small computer and device - Google Patents
Control method of system interface iSCSI receiving end window of internet small computer and device Download PDFInfo
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Abstract
The invention discloses a control method of a system interface iSCSI receiving end window of an internet small computer, comprising the following steps of: monitoring the state of a system interface SCSI receiving end window of the small computer; and controlling the size of a session window according to the change of the state of the SCSI window when detecting that the state of the SCSI window occurs change. The invention discloses a control device of the iSCSI receiving end window simultaneously. The invention can improve the resource utilization rate of the iSCSI receiving end and the access rate of the iSCSI receiving end.
Description
Technical field
The present invention relates to computer memory technical field, relate in particular to control method of system interface iSCSI receiving end window of internet small computer and device.
Background technology
ISCSI (Internet Small Computer System Interface, Internet Small Computer Systems Interface) agreement, be IETF (Internet Engineering Task Force, the Internet engineering duty group) network storage agreement based on the Internet TCP/IP (Transmission Control Protocol/Internet Protocol, transmission control protocol/Internet protocol) of Zhi Dinging.It has solved the problem of SCSI limited transmission distance system by existing ICP/IP protocol transmission SCSI (Small Computer System Interface, small computer system interface) bag.ISCSI transmitting terminal (Initiator) passes through forwarded with scsi command and data encapsulation again in the TCP/IP bag, iSCSI receiving terminal (Target) is received after the TCP/IP bag, the protocol processes front end is reduced to scsi command and data with it, and transfer to the rear end and carry out, after finishing the scsi command that returns and data are encapsulated in the TCP/IP bag again and return to the iSCSI transmitting terminal.
ISCSI receiving terminal and each iSCSI transmitting terminal are set up session (session), when a plurality of iSCSI transmitting terminals link to each other with the iSCSI receiving terminal, can have a plurality of sessions.Because the iSCSI agreement is based upon on the unsettled TCP/IP link, the arrival iSCSI receiving terminal that the order PDU (Protocol Data Unit, protocol Data Unit) that sends from the iSCSI transmitting terminal may be out of order.
In order to solve the problem of the out of order arrival of above-mentioned PDU iSCSI receiving terminal, in the prior art, be unit with the session, the PDU number that the window limit of usefulness fixed size can receive.The PDU that sends for the iSCSI transmitting terminal, if the sequence number of this PDU is in window ranges, or this PDU is PDU immediately, then the iSCSI receiving terminal receives and keeps in this PDU, waits pending; If the sequence number of this PDU is outside window ranges, and this PDU is non-PDU immediately, and then the iSCSI receiving terminal directly abandons this PDU, detects time-delay and retransmits PDU until the iSCSI transmitting terminal.
The inventor finds above-mentioned prior art with the session of fixing window size to different service types in realizing process of the present invention, adopt unified mode to manage in the time period of different flow having, though simple and convenient when implementing, there is following deficiency:
1, too small if window is provided with, iSCSI receiving terminal resource utilization is lower, will cause the backend resources waste; And because a lot of PDU that the iSCSI transmitting terminal sends can't be received, the iSCSI transmitting terminal can not receive the response of iSCSI receiving terminal, will cause the iSCSI transmitting terminal a plurality of PDU are retransmitted for many times, increases the processing pressure of iSCSI receiving terminal protocol processes front end.
2, excessive if window is provided with, iSCSI receiving terminal resource anxiety may cause scsi command and handle time-delay, and the iSCSI transmitting terminal can not receive the response of iSCSI receiving terminal, and the iSCSI transmitting terminal is retransmitted PDU, forms vicious circle, the influence business that reads and writes data.
3, for different sessions, network environment and type of service all have than big difference, use fixing window size can cause the load that each session is handled unbalanced.
Summary of the invention
The embodiment of the invention provides a kind of Internet Small Computer Systems Interface iSCSI iSCSI receiving end window control method, and in order to improve the access rate of iSCSI receiving terminal resource utilization, iSCSI transmitting terminal, this method comprises:
Monitoring small computer system interface SCSI Window state;
When detecting SCSI Window state generation change, according to the change of SCSI Window state, the size of control session window.
Preferable, described when detecting SCSI Window state generation change, according to the change of SCSI Window state, the size of control session window comprises:
Detect the SCSI Window state and change to busy condition, then the session window is reduced;
Detect the SCSI Window state and change to idle condition, then the session window is increased.
Preferable, described the session window is reduced to be meant: the session window size is reduced by half.
Preferable, described when detecting SCSI Window state generation change, according to the change of SCSI Window state, the size of control session window comprises:
Detect the SCSI Window state and change to idle condition, then control the size of session window according to the session window occupancy.
Preferable, described size according to session window occupancy control session window comprises:
If the session window occupancy continues to surpass first set point in first setting-up time, then the session window is increased;
If the session window occupancy does not continue to surpass first set point in first setting-up time, then keep the session window size constant.
Preferable, when SCSI window occupancy continued to surpass second set point in second setting-up time, the SCSI Window state changed to busy condition;
When SCSI window occupancy continued to be lower than the 3rd set point in the 3rd setting-up time, the SCSI Window state changed to idle condition.
Preferable, the described session window is increased is meant: the received quantity of session window iSCSI PDU is increased by 1.
The embodiment of the invention also provides a kind of iSCSI iSCSI receiving end window control device, and in order to improve the access rate of iSCSI receiving terminal resource utilization, iSCSI transmitting terminal, this device comprises:
SCSI window supervision module is used to monitor small computer system interface SCSI Window state; When detecting SCSI Window state generation change, send the notice that change takes place the SCSI Window state;
Session window regulation and control module is used for after receiving described notice, according to the change of SCSI Window state, and the size of control session window.
Preferable, described session window regulation and control module comprises:
The first regulator module is used for when the SCSI Window state changes to busy condition the session window being reduced;
The second regulator module is used for when the SCSI Window state changes to idle condition, and the session window is increased.
Preferable, described session window regulation and control module comprises:
The 3rd regulator module is used for when the SCSI Window state changes to idle condition, according to the size of session window occupancy control session window.
In the embodiment of the invention, the SCSI Window state is monitored, when detecting SCSI Window state generation change, according to the change of SCSI Window state, the size of control session window is because the loading condition and the type of service of SCSI Window state reflection iSCSI receiving terminal, therefore, can realize the iSCSI receiving terminal according to loading condition and type of service dynamic adjustments session window size, thereby effectively regulate the balance of receive window and back-end processing, improve iSCSI receiving terminal resource utilization; And the continuous variation of response service flow in time guarantees the timely processing of iSCSI PDU, improves the access rate of iSCSI transmitting terminal.
Further, detect the SCSI Window state and change to idle condition, then,, then the session window is increased if the session window occupancy continues to surpass first set point in first setting-up time according to the size of session window occupancy control session window; If the session window occupancy does not continue to surpass first set point in first setting-up time, then keep the session window size constant, can effectively realize the load balance between each session.
Description of drawings
The schematic diagram that Fig. 1 handles the iSCSI PDU that receives for iSCSI receiving terminal in the embodiment of the invention;
Fig. 2 is that the iSCSI iSCSI receiving end window concerns schematic diagram in the embodiment of the invention;
Fig. 3 is an Internet Small Computer Systems Interface iSCSI iSCSI receiving end window control flow chart in the embodiment of the invention;
Fig. 4 is the flow chart that monitoring SCSI Window state changes in the embodiment of the invention;
Fig. 5 is the flow chart of dynamic regulation session window state in the embodiment of the invention;
Fig. 6 changes to the schematic diagram of Warning_dec for SCSI Window state in the embodiment of the invention;
Fig. 7 is the schematic diagram of the session window state after reducing in the embodiment of the invention;
Fig. 8 changes to the schematic diagram of Warning_inc for SCSI Window state in the embodiment of the invention;
Fig. 9, Figure 10 are the schematic diagram of the session window state after increasing in the embodiment of the invention;
Figure 11 is the structural representation of iSCSI iSCSI receiving end window control device in the embodiment of the invention;
Figure 12, Figure 13 are the structural representation of session window regulation and control module in the embodiment of the invention.
Embodiment
The inventor considers, as memory device foremost, the efficient that the size of session window is set the data read-write has very big influence, and the loading condition of the setting of session window and current iSCSI receiving terminal, these two factors of type of service have very big getting in touch, the two constantly changes in system's running, thereby a kind of Internet Small Computer Systems Interface iSCSI iSCSI receiving end window control method is provided in embodiments of the present invention, in order to improve the access rate of iSCSI receiving terminal resource utilization, iSCSI transmitting terminal.
Relate to two class windows in the embodiment of the invention: SCSI window and session window.The iSCSI receiving terminal receives after the iSCSI PDU of iSCSI transmitting terminal transmission, resolves iSCSI PDU and obtains scsi command and data, scsi command is cached in the SCSI window waits for back-end processing; The corresponding session window of each session is used to receive the also iSCSI PDU of buffer memory iSCSI transmitting terminal transmission.
As shown in Figure 1, the protocol layer of iSCSI receiving terminal is handled the iSCSI PDU that receives, and parses scsi command and data, sends corresponding logical device layer to and handles, the logical device layer decomposes scsi command and data, transfers to rear end equipment and handles.
As shown in Figure 2, the protocol layer of iSCSI receiving terminal is the corresponding window of each session foundation of iSCSI receiving terminal.Concrete, for each session, set up a session window at front end, be used for buffer memory iSCSI PDU, set up a SCSI window in the rear end, be used for buffer memory and resolve the scsi command that iSCSI PDU obtains.
Because the loading condition and the type of service of SCSI Window state reflection iSCSI receiving terminal, therefore the iSCSI receiving terminal can periodically be checked the SCSI Window state, and its variation handled in real time, session window is carried out dynamic regulation, thereby effectively regulate the balance of receive window and back-end processing, improve iSCSI receiving terminal resource utilization; And the continuous variation of response service flow in time guarantees the timely processing of iSCSI PDU, improves the access rate of iSCSI transmitting terminal.
As shown in Figure 3, in the embodiment of the invention, Internet Small Computer Systems Interface iSCSI iSCSI receiving end window control flow is as follows:
Among the embodiment,, then the session window can be reduced if detecting the SCSI Window state changes to busy condition; If detecting the SCSI Window state changes to idle condition, then the session window can be increased.Wherein, the session window is reduced that multiple mode can be arranged, such as: the session window size is reduced by half, the session window is reduced with exponential manner etc.; The session window increased also can have multiple mode, such as: the session window size is linearly increased, the received quantity of session window iSCSI PDU is increased by 1 (that is: making the session window after the increase can receive 1 iSCSI PDU) etc. more.
In order effectively to realize the load balance between each session, among the embodiment, when detecting the SCSI Window state and change to idle condition, can be according to the size of session window occupancy control session window.
In the enforcement, can detect after the SCSI Window state changes to idle condition, the session window occupancy is carried out regularly or irregularly detecting, can certainly carry out periodicity detects, if the session window occupancy continues to surpass first set point in first setting-up time, then the session window is increased; If the session window occupancy does not continue to surpass first set point in first setting-up time, then keep the session window size constant.Wherein, the increase of session window also can there be multiple mode, such as: the received quantity of session window iSCSI PDU is increased by 1.
Aforementioned SCSI Window state changes to busy condition and is meant: when SCSI window occupancy continued to surpass second set point in second setting-up time, the SCSI Window state changed to busy condition; The SCSI Window state changes to idle condition and is meant: when SCSI window occupancy continued to be lower than the 3rd set point in the 3rd setting-up time, the SCSI Window state changed to idle condition.If iSCSI receiving terminal business is the more frequent business of reading and writing data, for example need the business of monitoring in real time, then SCSI window occupancy is higher; Otherwise then SCSI window occupancy is lower.The load capacity of iSCSI receiving terminal is big more within a certain period of time, and then SCSI window occupancy is high more; Load capacity is more little, and then SCSI window occupancy is low more.
Illustrate the enforcement of embodiment of the invention scheme below.The parameter-definition that relates in this example is as follows:
SCSI_occup_perc_upper represents the SCSI window occupancy upper limit, promptly aforementioned second set point;
SCSI_occup_perc_low represents SCSI window occupancy lower limit, promptly aforementioned the 3rd set point;
SCSI_remaing_time_upper represents SCSI window upper limit patient time, promptly aforementioned second setting-up time;
SCSI_remaing_time_low represents SCSI lower window edge patient time, promptly aforementioned the 3rd setting-up time;
Sess_occup_perc_upper represents the session window occupancy upper limit, promptly aforementioned first set point;
Sess_remaing_time_upper represents session window upper limit patient time, promptly aforementioned first setting-up time;
The concrete value of above-mentioned parameter can be provided with according to actual conditions.
The SCSI Window state that relates in this example is defined as follows:
Warning_dec: as SCSI window occupancy lasting SCSI_occup_perc_upper that surpasses in setting-up time SCSI_remaing_time_upper, then the SCSI Window state changes to Warning_dec, i.e. busy condition.
Warning_inc: when SCSI window occupancy continues to be lower than SCSI_occup_perc_low in setting-up time SCSI_remaing_time_low, then the SCSI Window state changes to Warning_inc, i.e. idle condition.
Normal: non-above two states then is the Normal state.
As shown in Figure 4, periodically monitor the SCSI window, when finding that the SCSI Window state changes to Warning_dec or Warning_inc, send the notice of SCSI Window state change.
As shown in Figure 5, receive the notice of SCSI Window state change after, determine the state after the change of SCSI window, if Warning_dec then reduces the session window, for example the session window is reduced by half; If Warning_inc then increases the session window, for example the received quantity with session window iSCSI PDU increases by 1.
As shown in Figure 6, when back end pressure is excessive, in the SCSI window buffer memory too much scsi command, the SCSI Window state changes to Warning_dec.When monitoring this variation of SCSI Window state, all session window are half-sized, reduce flow from front end, the session window state after reducing is as shown in Figure 7.
As shown in Figure 8, when back end pressure was less, the window occupancy was lower, and the SCSI Window state changes to Warning_inc.When monitoring this variation of SCSI Window state, with the received quantity increase by 1 of all session window iSCSI PDU, the session window state after the increase as shown in Figure 9.
In order effectively to realize the load balance between each session, in this example, if the SCSI Window state changes to Warning_inc, then further check the state of session window this moment, if the session window occupancy continues to surpass sess_occup_perc_upper in setting-up time sess_remaing_time_upper, then increase session window, for example the received quantity of session window iSCSI PDU can be increased by 1; Otherwise then keep the session window size constant.
As shown in figure 10, when the SCSI Window state is Warning_inc, will in setting-up time sess_remaing_time_upper, the session window occupancy continue to increase above two session window of sess_occup_perc_upper.
One of ordinary skill in the art will appreciate that all or part of step in the foregoing description method is to instruct relevant hardware to finish by program, this program can be stored in the computer-readable recording medium, and storage medium can comprise: ROM, RAM, disk or CD etc.
Based on same inventive concept, the embodiment of the invention also provides a kind of iSCSI iSCSI receiving end window control device, and its structure can comprise as shown in figure 11:
SCSI window supervision module 1101 is used to monitor small computer system interface SCSI Window state; When detecting SCSI Window state generation change, send the notice that change takes place the SCSI Window state;
Session window regulation and control module 1102 is used for after receiving described notice, according to the change of SCSI Window state, and the size of control session window.
As shown in figure 12, among the embodiment, session window regulation and control module 1102 can comprise:
The first regulator module 1201 is used for when the SCSI Window state changes to busy condition the session window being reduced;
The second regulator module 1202 is used for when the SCSI Window state changes to idle condition, and the session window is increased.
As shown in figure 13, among the embodiment, session window regulation and control module 1102 can comprise:
The 3rd regulator module 1301 is used for when the SCSI Window state changes to idle condition, according to the size of session window occupancy control session window.
In the embodiment of the invention, the SCSI Window state is monitored, when detecting SCSI Window state generation change, according to the change of SCSI Window state, the size of control session window is because the loading condition and the type of service of SCSI Window state reflection iSCSI receiving terminal, therefore, can realize the iSCSI receiving terminal according to loading condition and type of service dynamic adjustments session window size, thereby effectively regulate the balance of receive window and back-end processing, improve iSCSI receiving terminal resource utilization; And the continuous variation of response service flow in time guarantees the timely processing of iSCSI PDU, improves the access rate of iSCSI transmitting terminal.
Further, detect the SCSI Window state and change to idle condition, then,, then the session window is increased if the session window occupancy continues to surpass first set point in first setting-up time according to the size of session window occupancy control session window; If the session window occupancy does not continue to surpass first set point in first setting-up time, then keep the session window size constant, can effectively realize the load balance between each session.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1, a kind of Internet Small Computer Systems Interface iSCSI iSCSI receiving end window control method is characterized in that this method comprises:
Monitoring small computer system interface SCSI Window state;
When detecting SCSI Window state generation change, according to the change of SCSI Window state, the size of control session window.
2, the method for claim 1 is characterized in that, described when detecting SCSI Window state generation change, according to the change of SCSI Window state, the size of control session window comprises:
Detect the SCSI Window state and change to busy condition, then the session window is reduced;
Detect the SCSI Window state and change to idle condition, then the session window is increased.
3, method as claimed in claim 2 is characterized in that, described the session window is reduced to be meant: the session window size is reduced by half.
4, the method for claim 1 is characterized in that, described when detecting SCSI Window state generation change, according to the change of SCSI Window state, the size of control session window comprises:
Detect the SCSI Window state and change to idle condition, then control the size of session window according to the session window occupancy.
5, method as claimed in claim 4 is characterized in that, described size according to session window occupancy control session window comprises:
If the session window occupancy continues to surpass first set point in first setting-up time, then the session window is increased;
If the session window occupancy does not continue to surpass first set point in first setting-up time, then keep the session window size constant.
As claim 2 or 4 described methods, it is characterized in that 6, when SCSI window occupancy continued to surpass second set point, the SCSI Window state changed to busy condition in second setting-up time;
When SCSI window occupancy continued to be lower than the 3rd set point in the 3rd setting-up time, the SCSI Window state changed to idle condition.
As claim 2 or 4 described methods, it is characterized in that 7, the described session window is increased is meant: the received quantity of session window iSCSI protocol Data Unit PDU is increased by 1.
8, a kind of iSCSI iSCSI receiving end window control device is characterized in that, comprising:
SCSI window supervision module is used to monitor small computer system interface SCSI Window state; When detecting SCSI Window state generation change, send the notice that change takes place the SCSI Window state;
Session window regulation and control module is used for after receiving described notice, according to the change of SCSI Window state, and the size of control session window.
9, device as claimed in claim 8 is characterized in that, described session window regulation and control module comprises:
The first regulator module is used for when the SCSI Window state changes to busy condition the session window being reduced;
The second regulator module is used for when the SCSI Window state changes to idle condition, and the session window is increased.
10, device as claimed in claim 8 is characterized in that, described session window regulation and control module comprises:
The 3rd regulator module is used for when the SCSI Window state changes to idle condition, according to the size of session window occupancy control session window.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103124234A (en) * | 2011-11-18 | 2013-05-29 | 北京旋极信息技术股份有限公司 | Transmission system of Ethernet signal in private network |
| CN103975563A (en) * | 2011-12-06 | 2014-08-06 | 博科通迅系统有限公司 | Lossless connection failover for single devices |
| WO2017101875A1 (en) * | 2015-12-18 | 2017-06-22 | 华为技术有限公司 | Transmission rate control method and device based on iscsi protocol |
| CN109862297A (en) * | 2017-11-30 | 2019-06-07 | 浙江宇视科技有限公司 | Window regulation method, device and readable storage medium storing program for executing |
| CN110417716A (en) * | 2018-06-28 | 2019-11-05 | 腾讯科技（深圳）有限公司 | Control method, device, server, terminal and the storage medium of communication session |
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| US6915466B2 (en) * | 1999-04-19 | 2005-07-05 | I-Tech Corp. | Method and system for multi-user channel allocation for a multi-channel analyzer |
| CN101123485B (en) * | 2007-09-20 | 2011-05-11 | 杭州华三通信技术有限公司 | iSCSI packet processing method and device, error recovery method and device |
| CN101132376B (en) * | 2007-09-28 | 2011-06-15 | 杭州华三通信技术有限公司 | Method, device and corresponding system for controlling iSCSI message transmitting and receiving |
| CN100552613C (en) * | 2007-12-26 | 2009-10-21 | 杭州华三通信技术有限公司 | A kind of scsi data reading/writing method, system and device |
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| CN103124234A (en) * | 2011-11-18 | 2013-05-29 | 北京旋极信息技术股份有限公司 | Transmission system of Ethernet signal in private network |
| CN103975563A (en) * | 2011-12-06 | 2014-08-06 | 博科通迅系统有限公司 | Lossless connection failover for single devices |
| CN103975563B (en) * | 2011-12-06 | 2017-04-12 | 博科通迅系统有限公司 | Lossless connection failover for single devices |
| WO2017101875A1 (en) * | 2015-12-18 | 2017-06-22 | 华为技术有限公司 | Transmission rate control method and device based on iscsi protocol |
| CN106899510A (en) * | 2015-12-18 | 2017-06-27 | 华为技术有限公司 | A kind of transmission rate control and device based on iSCSI protocol |
| CN106899510B (en) * | 2015-12-18 | 2020-04-03 | 华为技术有限公司 | Transmission rate control method and device based on iSCSI protocol |
| CN109862297A (en) * | 2017-11-30 | 2019-06-07 | 浙江宇视科技有限公司 | Window regulation method, device and readable storage medium storing program for executing |
| CN110417716A (en) * | 2018-06-28 | 2019-11-05 | 腾讯科技（深圳）有限公司 | Control method, device, server, terminal and the storage medium of communication session |
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| CN101448022B (en) | 2012-05-30 |
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