CN101483671B - Method, system and initial terminal apparatus for enhancing iSCSI session transmission rate - Google Patents
Method, system and initial terminal apparatus for enhancing iSCSI session transmission rate Download PDFInfo
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- CN101483671B CN101483671B CN2009100774707A CN200910077470A CN101483671B CN 101483671 B CN101483671 B CN 101483671B CN 2009100774707 A CN2009100774707 A CN 2009100774707A CN 200910077470 A CN200910077470 A CN 200910077470A CN 101483671 B CN101483671 B CN 101483671B
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Abstract
The invention provides a method, system and initial end device for improving transmission rate of Internet-based Small Computer System Interface (iSCSI) session; wherein the method comprises: periodically obtaining a Round-Trip Time (RTT) of iSCSI connection in the iSCSI session, judging whether the RTT exceeds the preset threshold value; when it exceeds the preset threshold value, re-establishing an iSCSI connection, adding the re-established iSCSI connection in the iSCSI session. The invention can improve the transmission rate of the iSCSI session.
Description
Technical field
The present invention relates to small computer system interface (iSCSI based on the internet, internet SmallComputer System Interface) protocol technology field, particularly a kind of method, system and originating end device that improves the iSCSI session transmission rate.
Background technology
The iSCSI agreement is a kind of host-host protocol, and hardware coder carries out transfer of data by iSCSI agreement and memory device communication.The realization of iSCSI agreement can be used the function of SCSI on IP network, advantages such as the maturity of present networks and popularization have been made full use of, allow the user to make up storage area network (SAN by the TCP/IP network, the ability of DASD is provided for enterprise Storage Area Network).
Communication between originating end of iSCSI agreement (Initiator) and the destination end (Target) is connected by one or more iSCSI to be finished, and the iSCSI connection is transmitted data by sending iSCSI protocol Data Unit (iSCSIPDU).All iSCSI that connect an Initiator and Target connect and compose an iSCSI session (iSCSI Session), and each iSCSI connection can be added into the iSCSI session or shift out from the iSCSI session.
Because the iSCSI agreement is carried on the Transmission Control Protocol, before setting up the iSCSI connection, at first needs to set up TCP and connect.The IP-based iSCSI transmission TCP that places one's entire reliance upon connects, and for connecting any iSCSI request that transmits by a TCP, response accordingly and/or other relevant iSCSIPDU must connect via same TCP and send.
Transmission Control Protocol possesses the mechanism that stands the time delay affirmation, and promptly receiving terminal does not send ACK message immediately when receiving data, but ACK message is postponed, and the data that need to send in the direction with the next one send.The time delay affirmation mechanism that stands of Transmission Control Protocol impacts the transmission rate that TCP connects, and imbody is in following formula:
Wherein, Loop Round Trip Time (RTT, Round-Trip Time) expression sends data from transmitting terminal, receives from the time between the affirmation message of receiving terminal to transmitting terminal;
P represents the data-bag lost rate;
By above-mentioned formula as seen, Transmission Control Protocol stand the increase that the time delay affirmation mechanism directly causes RTT because the transmission rate that RTT is connected with TCP is inversely proportional to, and then cause the transmission rate reduction of TCP connection.
TCP connects because the iSCSI establishment of connection places one's entire reliance upon, and therefore, the transmission rate that iSCSI connects also is subjected to the influence of above-mentioned formula, that is: the time delay affirmation mechanism that stands by Transmission Control Protocol causes the transmission rate of iSCSI connection to descend.Further, because the iSCSI session is connected to form by iSCSI, finally cause the transmission rate of iSCSI session to descend.
Summary of the invention
The embodiment of the invention proposes a kind of method that improves the iSCSI session transmission rate, can improve the transmission rate of iSCSI session, improves the throughput of transmissions of iSCSI effectively.
The embodiment of the invention also proposes a kind of system and originating end device of the iSCSI of raising session transmission rate, can improve the transmission rate of iSCSI session, improves the throughput of transmissions of iSCSI effectively.
The technical scheme of the embodiment of the invention is achieved in that
A kind of method that improves the iSCSI session transmission rate comprises:
Whether the transmission rate of judging the iSCSI session allows to improve, if, periodically obtain RTT that iSCSI connects in the iSCSI session, judge whether this RTT surpasses predefined threshold value, when surpassing threshold value, rebulid an iSCSI and connect, the described iSCSI that rebulids is connected in the described iSCSI session of adding.
A kind of originating end device that improves the iSCSI session transmission rate comprises:
ISCSI session speed monitoring module is used to judge whether the transmission rate of described iSCSI session allows to improve, and when allowing to improve, order RTT monitoring module obtains the RTT that any one iSCSI connects in the iSCSI session;
The RTT monitoring module, after being used to receive the order that described iSCSI session speed monitoring module sends, periodically obtain RTT that iSCSI connects in the iSCSI session, judge whether this RTT surpasses predefined threshold value, when surpassing threshold value, order iSCSI session maintenance module is set up new iSCSI and is connected;
ISCSI session maintenance module is used for setting up iSCSI according to the order of RTT monitoring module and connects, and this iSCSI is connected add in the iSCSI session.
As seen, method, system and the originating end device of the raising iSCSI session transmission rate that the present invention proposes, obtain the RTT value of transfer of data in the iSCSI connection in real time, the RTT value that connects as iSCSI is excessive and when influencing message transmission rate, increasing iSCSI in current iSCSI session connects, realize effectively sharing of load, thereby improve the transmission rate of iSCSI session.
Description of drawings
Fig. 1 is the inventive method embodiment flow chart;
Fig. 2 is the realization flow figure that obtains the RTT of iSCSI connection among the inventive method embodiment;
Fig. 3 is the structural representation of embodiment of the invention originating end device.
Embodiment
Design philosophy of the present invention is: set up successfully when the initial iSCSI of iSCSI session connects, when carrying out the transmission of iSCSIPDU, periodically obtain the RTT of initial iSCSI connection and judge whether RTT surpasses the tolerance interval of expection, until judge above the time, illustrating increases new iSCSI immediately and connects because the influence that is subjected to Transmission Control Protocol to stand the time delay affirmation mechanism makes that the transmission rate of whole iSCSI session is low excessively this moment.
After increasing new iSCSI and connecting, if the transmission rate of whole iSCSI session improves, it is more than needed illustrate that the network bandwidth also has, and increases the iSCSI connection in the time of can surpassing the tolerance interval of expection in this case at the RTT that iSCSI connects once more; If the transmission rate of whole iSCSI session does not improve, the limiting value that has reached the network bandwidth is described, make the iSCSI that increases newly connect the effect that can't play load balancing owing to the network bandwidth that does not have the free time for its use, process ends in this case.
The method of the raising iSCSI session transmission rate that the present invention proposes can comprise:
Periodically obtain RTT that iSCSI connects in the iSCSI session, judge whether this RTT surpasses predefined threshold value, when surpassing threshold value, rebulid an iSCSI and connect, the described iSCSI connection that rebulids is added in the described iSCSI session.
Only comprise the situation that an initial iSCSI connects at the iSCSI session, the RTT of an iSCSI connection can be specially in the above-mentioned iSCSI of the obtaining session: obtain the RTT that initial iSCSI connects in the iSCSI session.
At comprising the situation that a plurality of iSCSI connect in the iSCSI session, the RTT of an iSCSI connection can be specially in the above-mentioned iSCSI of the obtaining session: obtain the RTT that any one iSCSI connects in the iSCSI session;
May further include before obtaining the RTT that any one iSCSI connects in the iSCSI session: whether the transmission rate of judging described iSCSI session allows to improve, if allow to improve, then continue to carry out the described step of obtaining the RTT that any one iSCSI connects in the iSCSI session; If do not allow to improve, then finish current flow process.
In the said method, judge that the mode whether transmission rate of iSCSI session allows to improve can be specially: the transmission rate that will add the iSCSI session of new iSCSI after connecting with add the transmission rate that new iSCSI is connected iSCSI session before and compare, transmission rate after adding judges that then the transmission rate of described iSCSI session allows to improve during greater than the transmission rate before adding.
Followingly introduce the present invention in detail with reference to accompanying drawing 1.Referring to Fig. 1, Fig. 1 is the inventive method embodiment flow chart.The method of the raising iSCSI session transmission rate that the present invention proposes comprises:
Step 101: the initial iSCSI that sets up the iSCSI session connects.
Step 102: periodically obtain the RTT that initial iSCSI connects, and judge whether this RTT surpasses predefined threshold value, when RTT surpasses predefined threshold value, execution in step 103; Predefined herein threshold value can be the tolerance interval of RTT expection.
Step 103: set up new iSCSI and connect.
Step 104: new iSCSI connection is joined in the iSCSI session.
In the said method, may further include after the step 104:
Step 105: whether the transmission rate of judging the iSCSI session allows to improve, if allow to improve, then execution in step 106; Otherwise method ends flow process.In this step, judge that the mode whether transmission rate of iSCSI session allows to improve is: the transmission rate that will add the iSCSI session of new iSCSI after connecting with add the transmission rate that new iSCSI is connected iSCSI session before and compare, transmission rate after adding judges that then the transmission rate of iSCSI session allows to improve during greater than the transmission rate before adding.Wherein, the transmission rate of iSCSI session can obtain by the byte number that sends in the originating end device calculates specific duration.
Step 106: periodically obtain the RTT that any one iSCSI connects in the iSCSI session, and judge whether this RTT surpasses described predefined threshold value (because the RTT that each iSCSI connects in the same iSCSI session is very nearly the same, therefore can adopt the RTT of wherein any one iSCSI connection to judge), when RTT surpasses predefined threshold value, return execution in step 103.In this step, predefined threshold value can be the tolerance interval of RTT expection.
From said process as seen, after increasing new iSCSI connection in the iSCSI session, if the transmission rate of whole iSCSI session does not improve, illustrate that the network bandwidth is saturated at this moment, increase the iSCSI session again and also can not play the effect of load balancing, just no longer calculate RTT that iSCSI connects in this case, also no longer increase new iSCSI and connect.So both can in an iSCSI session, utilize a plurality of iSCSI to connect and carry out load balancing, and can not increase new iSCSI connection again meaninglessly and cause waste, improve the transmission rate of iSCSI session effectively.
In the present invention, can periodically carry out the mutual of temporal information, obtain the RTT that iSCSI connects in real time by NOP-Out PDU and the NOP-OutPDU that has defined in the iSCSI agreement.Detailed process is referring to Fig. 2, and Fig. 2 is the realization flow figure that obtains the RTT of iSCSI connection among the inventive method embodiment.
Step 201: the originating end device adopts iSCSI to connect to the destination end device and sends NOP-Out PDU, and described NOP-Out PDU comprises the expression originating end and sends NOP-Out PDU timestamp A1 constantly;
Step 202: the destination end device receives NOP-Out PDU, generates corresponding NOP-In PDU, and NOP-InPDU comprises timestamp A1, increases expression destination end device and receive NOP-Out PDU timestamp B1 constantly in NOP-In PDU;
Step 203: the iSCSI that the destination end device adopts the originating end device to be adopted connects when sending NOP-InPDU, increases expression destination end device and send NOP-In PDU timestamp B2 constantly in NOP-In PDU;
Step 204: the originating end device receives this NOP-In PDU, the moment A2 of this NOP-In PDU of recorder;
So far, the RTT that the originating end device has this iSCSI of enough information calculations to connect, that is:
RTT＝B1-A1+A2-B2
In the said method, timestamp can adopt reservation (reserve) field among NOP-In PDU or the NOP-Out PDU to encapsulate.
The embodiment of the invention also proposes a kind of system of the iSCSI of raising session transmission rate, comprising: originating end device and destination end device;
The originating end device, be used for periodically obtaining the RTT that iSCSI of iSCSI session connects, judge whether this RTT surpasses predefined threshold value, when surpassing threshold value, the iSCSI that rebulids between an originating end device and the destination end device connects, and the described iSCSI that rebulids is connected add in the described iSCSI session.
In the said system, the originating end device obtain in the iSCSI session RTT that an iSCSI connects can for: obtain the RTT that initial iSCSI connects in the iSCSI session.
In the said system, the originating end device obtain in the iSCSI session RTT that an iSCSI connects can also for: obtain the RTT that any one iSCSI connects in the iSCSI session;
The originating end device can also be used for, and judges whether the transmission rate of iSCSI session allows to improve, and when allowing to improve, continues to carry out the described step of obtaining the RTT that any one iSCSI connects in the iSCSI session.
The embodiment of the invention also proposes a kind of originating end device of the iSCSI of raising session transmission rate, and referring to Fig. 3, Fig. 3 is the structural representation of embodiment of the invention originating end device, comprising:
ISCSI session maintenance module 302 is used for setting up iSCSI according to the order of RTT monitoring module 301 and connects, and adds in the iSCSI session during this iSCSI is connected.
Above-mentioned originating end device can also comprise:
ISCSI session speed monitoring module 303 is used to judge whether the transmission rate of iSCSI session allows to improve, and when allowing to improve, order RTT monitoring module 301 obtains the RTT that any one iSCSI connects in the iSCSI session.
In the above-mentioned originating end device, the RTT monitoring module can comprise:
NOP-Out PDU sending module is used to adopt iSCSI to connect to the destination end device and sends NOP-OutPDU, and described NOP-Out PDU comprises expression originating end device and sends NOP-Out PDU timestamp A1 constantly;
NOP-In PDU receiver module is used to receive the NOP-In PDU of described NOP-Out PDU correspondence, the A2 time of reception of record NOP-In PDU; Obtain the expression originating end device that is comprised among the NOP-In PDU and send the NOP-Out PDU timestamp A1 in the moment, expression destination end device reception NOP-Out PDU timestamp B1 and expression destination end device transmission NOP-In PDU timestamp B2 constantly constantly;
The RTT computing module is used to adopt RTT=B1-A1+A2-B2 to calculate the RTT that iSCSI connects.
In sum, method, system and the originating end device of the raising iSCSI session transmission rate that the present invention proposes, utilize that defined NOP-Out/-In PDU carries out the encapsulation of temporal information in the iSCSI agreement, so that obtain the RTT value of transfer of data in the iSCSI connection in real time.The RTT value that connects as iSCSI is big and when influence message transmission rate, increase iSCSI to connect in current iSCSI session, thus the transmission rate of effectively sharing raising iSCSI session of realization load.Simultaneously, after the new iSCSI of the present invention's every increase in the iSCSI session connects, promptly the transmission rate of iSCSI session is monitored, guarantee that the increase of iSCSI connection each time can both improve the transmission rate of iSCSI session effectively.When the transmission rate of iSCSI session no longer increases, stop calculating immediately to the RTT value, effectively save system resource, avoid increasing unnecessary iSCSI meaninglessly and connect.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (7)
1. a raising is characterized in that based on the method for the small computer system interface iSCSI session transmission rate of internet described method comprises:
Whether the transmission rate of judging the iSCSI session allows to improve, if, periodically obtain Loop Round Trip Time RTT that iSCSI connects in the described iSCSI session, judge whether this RTT surpasses predefined threshold value, when surpassing threshold value, rebulid an iSCSI and connect, the described iSCSI that rebulids is connected in the described iSCSI session of adding.
2. method according to claim 1 is characterized in that, the RTT of an iSCSI connection is in the described iSCSI of the obtaining session: obtain the RTT that initial iSCSI connects in the iSCSI session.
3. method according to claim 1 is characterized in that, the RTT of an iSCSI connection is in the described iSCSI of the obtaining session: obtain the RTT that any one iSCSI connects in the iSCSI session.
4. method according to claim 1, it is characterized in that, whether the transmission rate of the described iSCSI of judgement session allows rises to: the transmission rate that will add the new iSCSI iSCSI session after connecting with add the transmission rate that new iSCSI is connected iSCSI session before and compare, transmission rate after adding is during greater than the transmission rate before adding, and judges that the transmission rate of the iSCSI session before the new iSCSI session connection of described adding allows to improve.
5. according to any described method in the claim 1 to 4, it is characterized in that, the mode of obtaining the RTT of iSCSI connection is: the originating end device adopts iSCSI to connect to the destination end device and sends NOP-Out protocol Data Unit PDU, and described NOP-Out PDU comprises expression originating end device transmission NOP-Out PDU timestamp A1 constantly;
The destination end device receives described NOP-Out PDU, generates corresponding NOP-In PDU, and described NOP-In PDU comprises timestamp A1, increases the expression destination end and receive NOP-Out PDU timestamp B1 constantly in NOP-In PDU;
The destination end device adopts described iSCSI to connect and sends described NOP-In PDU, increases the expression destination end and send NOP-In PDU timestamp B2 constantly in NOP-In PDU;
The originating end device receives described NOP-In PDU, and record originating end device receives the moment A2 of NOP-In PDU, adopts RTT=B1-A1+A2-B2 to calculate the RTT that iSCSI connects.
6. an originating end device that improves the iSCSI session transmission rate is characterized in that, described originating end device comprises:
ISCSI session speed monitoring module is used to judge whether the transmission rate of described iSCSI session allows to improve, and when allowing to improve, order RTT monitoring module obtains the RTT that any one iSCSI connects in the iSCSI session;
The RTT monitoring module, after being used to receive the order that described iSCSI session speed monitoring module sends, periodically obtain RTT that iSCSI connects in the iSCSI session, judge whether this RTT surpasses predefined threshold value, when surpassing threshold value, order iSCSI session maintenance module is set up new iSCSI and is connected;
ISCSI session maintenance module is used for setting up iSCSI according to the order of RTT monitoring module and connects, and this iSCSI is connected add in the iSCSI session.
7. originating end device according to claim 6 is characterized in that, described RTT monitoring module comprises:
NOP-Out PDU sending module is used to adopt iSCSI to connect to the destination end device and sends NOP-Out PDU, and described NOP-Out PDU comprises expression originating end device and sends NOP-Out PDU timestamp A1 constantly;
NOP-In PDU receiver module is used to receive the NOP-In PDU of described NOP-Out PDU correspondence, the A2 time of reception of record NOP-In PDU; Obtain the expression originating end device that is comprised among the NOP-In PDU and send the NOP-Out PDU timestamp A1 in the moment, expression destination end device reception NOP-Out PDU timestamp B1 and expression destination end device transmission NOP-In PDU timestamp B2 constantly constantly;
The RTT computing module is used to adopt RTT=B1-A1+A2-B2 to calculate the RTT that iSCSI connects.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1947384A (en) * | 2004-05-05 | 2007-04-11 | 艾利森电话股份有限公司 | Hsdpa flow control, control frames rtt measurement |
| CN101115009A (en) * | 2007-08-31 | 2008-01-30 | 杭州华三通信技术有限公司 | Storage resource access control method, storage control system and applied host machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1947384A (en) * | 2004-05-05 | 2007-04-11 | 艾利森电话股份有限公司 | Hsdpa flow control, control frames rtt measurement |
| CN101115009A (en) * | 2007-08-31 | 2008-01-30 | 杭州华三通信技术有限公司 | Storage resource access control method, storage control system and applied host machine |
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Address after: 310052 Binjiang District Changhe Road, Zhejiang, China, No. 466, No. Patentee after: Xinhua three Technology Co., Ltd. Address before: 310053 Hangzhou hi tech Industrial Development Zone, Zhejiang province science and Technology Industrial Park, No. 310 and No. six road, HUAWEI, Hangzhou production base Patentee before: Huasan Communication Technology Co., Ltd. |
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Granted publication date: 20111026 Termination date: 20200212 |