CN101883028B - Method and device for detecting network file system server - Google Patents
Method and device for detecting network file system server Download PDFInfo
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Abstract
The invention discloses a method and a device for detecting a network file system server. The method comprises the following steps: a network system file client mounts network file system servers the mounting status of which is not mounted according to data configuration; when mounting is successful, a status checking file corresponding to the network file system server is built, and the status of the network file system server is set to be mounted; the network system file client periodically visits the status checking file; and when the visit fails, alarm is sent, and the status of the network file system server is set to be not mounted. By adopting the invention, the stability and controllability of upper-layer service are ensured and user experience is improved.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of detection method and device of network file system server.
Background technology
At present, the index of the memory property of evaluation and measurement stream medium audio and video server has memory capacity, throughput performance, reliability, stability and manageability, maintainability etc.The disk connected by bus is a kind of (being also first-selected) storage medium mainly that stream medium audio and video server provides business service.But, along with the continuous change of application model, more and more higher to the requirement of network storage capabilities, thisly depend on specific hardware environment and the storage medium not easily expanded has embodied its limitation, simultaneously, NFS as a part of Distributed Computer System, as the first-selection expanding hard disc storage ability.
In the related, NFS has become a kind of standard of file service, it can allow the computer shared file of different operating system or data, by using the mode of streaming media server blade as the plug-in network file system server of NFS client, expand streaming media server end storage capacity to a great extent.But, inventor finds in above-mentioned correlation technique because NFS is based on insecure User Datagram Protoco (UDP) (User Datagram Protocol, referred to as UDP), so when network file system server occurs abnormal, the state of network file system server cannot be detected.
Summary of the invention
Main purpose of the present invention is the detection scheme providing a kind of network file system server, at least to solve the problem that the state of network file system server cannot be detected when network file system server occurs abnormal in above-mentioned correlation technique.
To achieve these goals, according to an aspect of the present invention, a kind of detection method of network file system server is provided.
According to the detection method of network file system server of the present invention, comprise the following steps: NFS client carries out carry according to data configuration to the network file system server that carry state is non-carry; During carry success, creates the status checkout file corresponding with network file system server, and the carry state arranging network file system server is carry; NFS client periodically Access status checks file; And when accessing unsuccessfully, send alarm, and the carry state of network file system server is set for non-carry.
Further, NFS client periodically Access status checks that file comprises: in network file system server fault or with in the inaccessible situation of the network of network file system server, the failure of NFS client-access status checkout file.
Further, NFS client-access status checkout file unsuccessfully comprises: when NFS client receives Access status inspection file failure or detects that blocking time exceedes scheduled duration, the network file system server that unloading is corresponding.
Further, NFS client periodically Access status check file comprise: NFS client timer access and carry state are the status checkout file that the network file system server of carry is corresponding; When accessing continuous failed number of times and being greater than threshold value, the carry state of unloading correspondence is the network file system server of carry.
Further, when accessing unsuccessfully, send alarm, and the carry state arranging network file system server is that non-carry comprises: the operating state arranging network file system server is unavailable, and the state of more corresponding with network file system server in new database blade.
Further, network file system server is multiple; NFS client is multiple.
To achieve these goals, according to a further aspect in the invention, a kind of checkout gear of network file system server is additionally provided.
According to the checkout gear of network file system server of the present invention, comprising: the first carry module, according to data configuration, carry is carried out to the network file system server that carry state is non-carry for NFS client; First creation module, for when the first carry module carry is successful, creates the status checkout file corresponding with network file system server; First access modules, for NFS client periodically Access status inspection file; First alarm module, for when the first access modules is accessed unsuccessfully, sends alarm; And first arranges module, for when the first carry module carry success, the carry state arranging network file system server is carry; When the first access modules is accessed unsuccessfully, the carry state of network file system server is set for non-carry.
Further, the first access modules also in network file system server fault or with in the inaccessible situation of the network of network file system server, the failure of NFS client-access status checkout file.
Further, first access modules is also in network file system server fault or with in the inaccessible situation of the network of network file system server, when NFS client receives Access status inspection file failure or detects that blocking time exceedes scheduled duration, the network file system server that unloading is corresponding.
Further, the first access modules is also the status checkout file that the network file system server of carry is corresponding for NFS client timer access and carry state; And when accessing continuous failed number of times and being greater than threshold value, the carry state of unloading correspondence is the network file system server of carry.
To achieve these goals, according to another aspect of the invention, a kind of NFS client is additionally provided.
According to NFS client of the present invention, comprising: the second carry module, for being that the network file system server of non-carry carries out carry to carry state; Second creation module, for when the second carry module carry is successful, creates the status checkout file corresponding with network file system server; Second access modules, checks file for periodically Access status; Second alarm module, for when the second access modules is accessed unsuccessfully, sends alarm; And second arranges module, for when the second carry module carry success, the carry state arranging network file system server is carry; When the second access modules is accessed unsuccessfully, the carry state of network file system server is set for non-carry.
To achieve these goals, in accordance with a further aspect of the present invention, a kind of NFS is additionally provided.
According to NFS of the present invention, comprise multiple above-mentioned NFS clients and multiple network file system server.
Pass through the present invention, adopt the mode of the status checkout file of the network file system server of carry being carried out to cycle access, solve the problem that the state of network file system server cannot be detected when network file system server occurs abnormal in correlation technique, ensure that stability and the controllability of upper-layer service, improve Consumer's Experience.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the detection method flow chart of the network file system server according to the embodiment of the present invention;
Fig. 2 is the structured flowchart of the checkout gear of network file system server according to the embodiment of the present invention;
Fig. 3 is the structured flowchart of the NFS client according to the embodiment of the present invention;
Fig. 4 is the structured flowchart of the NFS according to the embodiment of the present invention;
Fig. 5 is the networking distribution schematic diagram of the NFS according to preferred embodiment of the present invention;
Fig. 6 is the operation level schematic diagram of the NFS according to example 1 of the present invention;
Fig. 7 is the structured flowchart of the NFS equipment control according to example 1 of the present invention;
Fig. 8 is the process chart of the state detection module according to example 2 of the present invention;
Fig. 9 is the process chart of the monitor processing module according to example 3 of the present invention.
Embodiment
Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
Fig. 1 is the detection method flow chart of the network file system server according to the embodiment of the present invention, and as shown in Figure 1, the method comprises the following steps:
Step S102, NFS client carries out carry according to data configuration to the network file system server that carry state is non-carry;
Step S104, during carry success, creates the status checkout file corresponding with network file system server, and the carry state arranging network file system server is carry;
Step S106, NFS client periodically Access status checks file; And
Step S108, when accessing unsuccessfully, sends alarm, and arranges the carry state of network file system server for non-carry.
Pass through the embodiment of the present invention, adopt the mode of the status checkout file of the network file system server of carry being carried out to cycle access, solve the problem that the state of network file system server cannot be detected when network file system server occurs abnormal in correlation technique, ensure that stability and the controllability of upper-layer service, improve Consumer's Experience.
Preferably, in step s 106, in network file system server fault or with in the inaccessible situation of the network of network file system server, the failure of NFS client-access status checkout file.
This preferred embodiment can by Access status check file failure and decision network file system server exception or network unreachable; make NFS client indirectly can obtain the state of network file system server; do and evade process timely; and then avoid the interruption of business, improve the disposal ability of system.
Preferably, in step s 106, NFS client-access status checkout file unsuccessfully comprises: when NFS client receives Access status inspection file failure or detects that blocking time exceedes scheduled duration, the network file system server that unloading is corresponding.
Preferably, in step s 106, NFS client timer access and carry state are the status checkout file that the network file system server of carry is corresponding; When accessing continuous failed number of times and being greater than threshold value, the carry state of unloading correspondence is the network file system server of carry.The method can when at network, unreachable or network file system server and client disconnect, and avoid task blocking, guarantee task is carried out smoothly, improves system effectiveness.
Preferably, in step S108, the operating state arranging network file system server is unavailable, and the state of more corresponding with network file system server in new database blade.The method by the applied business on the state notifying upper strata of network file system server, can improve the validity of system.
Preferably, network file system server is multiple; NFS client is multiple.The method can be carried out between multiple network file system server and multiple NFS client, extends range of application, improves the performance of system.
It should be noted that, NFS client periodically Access status checks file, can comprise following result: 1) return successfully, then the state that arranges is for carry; 2) return failure, then the server that directly unloading access is failed, the state that arranges is for non-carry; 3) failure can not be returned (namely, now interface blocks, the result of access cannot be learnt), another one module is then needed to go to detect the time of blocking, when block time more than a threshold values (namely, scheduled duration) time, forced unloading does not return the server of failure, and the state that arranges is for non-carry.
Fig. 2 is the structured flowchart of the checkout gear of network file system server according to the embodiment of the present invention, as shown in Figure 2, this device comprises: the first carry module 20, carries out carry for NFS client according to data configuration to the network file system server that carry state is non-carry; First creation module 22, for when the first carry module 20 carry is successful, creates the status checkout file corresponding with network file system server; First access modules 24, for NFS client periodically Access status inspection file; First alarm module 26, for when the first access modules 24 is accessed failed, sends alarm; And first arranges module 28, for when the first carry module 20 carry success, the carry state arranging network file system server is carry; When the first access modules 24 is accessed failed, the carry state of network file system server is set for non-carry.
Pass through the embodiment of the present invention, adopt the mode of the status checkout file of the network file system server of carry being carried out to cycle access, solve the problem that the state of network file system server cannot be detected when network file system server occurs abnormal in correlation technique, ensure that stability and the controllability of upper-layer service, improve Consumer's Experience.
Preferably, the first access modules 24 also in network file system server fault or with in the inaccessible situation of the network of network file system server, the failure of NFS client-access status checkout file.
Preferably, first access modules 24 is also in network file system server fault or with in the inaccessible situation of the network of network file system server, when NFS client receives Access status inspection file failure or detects that blocking time exceedes scheduled duration, the network file system server that unloading is corresponding.
Preferably, the first access modules 24 is also the status checkout file that the network file system server of carry is corresponding for NFS client timer access and carry state; And when accessing continuous failed number of times and being greater than threshold value, the carry state of unloading correspondence is the network file system server of carry.
Fig. 3 is the structured flowchart of the NFS client according to the embodiment of the present invention, and as shown in Figure 3, this client 300 comprises: the second carry module 302, for being that the network file system server of non-carry carries out carry to carry state; Second creation module 304, for when the second carry module 302 carry is successful, creates the status checkout file corresponding with network file system server; Second access modules 306, checks file for periodically Access status; Second alarm module 308, for when the second access modules 306 is accessed failed, sends alarm; And second arranges module 310, for when the second carry module 302 carry success, the carry state arranging network file system server is carry; When the second access modules 306 is accessed failed, the carry state of network file system server is set for non-carry.
Fig. 4 is the structured flowchart of the NFS according to the embodiment of the present invention, and as shown in Figure 4, a kind of NFS, comprises multiple above-mentioned NFS clients and multiple network file system server.
In specific implementation process, the embodiment of the present invention can adopt and detect in real time the state of network file system server and the mode of state reporting, the management between NFS client and server is made to become simple and practical, for the stability and the controllability that ensure upper-layer service, good expansion is both provided for shaping hardware storage capacity, reduces the cost of redesign.
Fig. 5 is the networking distribution schematic diagram according to preferred embodiment of the present invention, as shown in Figure 5, by multiple streaming media server blade (namely, NFS client) network consisting file system client group, with the relation that network file system server group is multi-to-multi, realize the management between multi-to-multi client and server end.
When NFS client and server multi-to-multi, the access of the reliability of NFS is provided and abnormal to server state time monitoring, be a kind of Design and implementation method that upper-layer service can be evaded this anomaly, expanded the hardware storage capacity of system.
Be described in detail below in conjunction with the implementation procedure of example to the embodiment of the present invention.
Example 1
Fig. 6 is the operation level schematic diagram of the NFS according to example 1 of the present invention, as shown in Figure 6, NFS equipment control (in figure dash area) is positioned at NFS client, and major function is for upper strata read-write business provides the reliable network storage equipment.When the network storage equipment is unavailable, by operating database, and notify that upper strata read-write business carries out evasive action, ensure the stable and smooth of service operation.
Fig. 7 is the structured flowchart of the NFS equipment control according to example 1 of the present invention, as shown in Figure 7, NFS equipment control comprises: dynamically carry module 72, state detection module 74 and monitor processing module 76, is described in detail to the function of modules below.
Dynamic carry module 72, for carrying out carry (carry can be understood as connection here) according to data configuration to the mount point (that is, network file system server) that each carry state is non-carry.Particularly, if carry failure, then the alarm of relevant carry failure is sent, by carry state reporting database positioning table; If carry success, then creation state checks file, such as, can called after nfscheck file, arranging carry state is carry success.
State detection module 74, for creating the state-detection task of respective numbers according to the total number can joining mount point, this state-detection task for realize to mount point state whether can detection.In specific implementation process, state-detection task can every 500 milliseconds run once, access the nfscheck file created after dynamic carry module 72 carry success, when network file system server fault or the inaccessible situation of network, the state that file access failure now arranges this mount point is unavailable (now not necessarily failure, it is likely blocked state, do not return and the state of this mount point will be set to unavailable by monitor processing module 76 in this case), the more state of this blade of new database, and send the unavailable alarm of mount point, unload this mount point, be non-carry by the carry state of the information of this mount point, then dynamic carry module 72 carry is again given, simultaneously, arranging mount point detection counter is zero.
Monitor processing module 76, for creating a monitor task preventing network reason from causing Detection task to block.In specific implementation process, when monitor task often runs once (such as, this monitor task can execution per second once, namely, time of implementation can be greater than time of state-detection task run), then 1 is added to the mount point detection counter of successful carry, state detection module 74 can reset this detection counter after the success of access nfscheck file simultaneously, if now state detection module 74 blocks, after mount point detection counting rises to a threshold values, monitor processing module 76 can think that now network is unreachable, this mount point of forced unloading, be unavailable by the state of mount point, make state-detection task continue operation to go down, and the state of more this blade of new database, send the unavailable alarm of mount point, the carry state of the information of mount point is set for non-carry, give dynamic carry module 72 carry again.It should be noted that, the object creating monitoring Processing tasks is here in order to when accessing the continuous failed number of times of nfscheck file and being greater than threshold value, unloads the network file system server that corresponding carry state is carry.Such as, under the state of hard carry, when the network between client and server is unreachable, state-detection task can be blocked when the inaccessible nfscheck file of access services device, and cause state-detection task to perform down, now state-detection task does not reoffer service.
Briefly, the embodiment of the present invention is the automatic carry being realized network file system server and client by database configuration, and server state is monitored in real time, and for being in the server of abnormality, then can by alarm and state reporting (namely, the renewal of server state in database) mode notify that upper layer application business is done and evade process, avoid service disconnection.
Visible, this example 1 can detect the state of server in the NFS client of multi-to-multi network relation, the exception that server likely occurs is detected, and notify that upper-layer service is evaded, preferably other server, thus ensure that server or between client and server, network state is abnormal time, the seamless cutting of business can be carried out.
Example 2
Fig. 8 is the process chart of the state detection module according to example 2 of the present invention, as shown in Figure 8, each carry item (that is, network file system server) can create a state-detection task, and imports the numbering of carry item into when this state-detection task is initial.Particularly, the processing procedure of state detection module can comprise the following steps:
Step S802, state-detection task starts, and calls the delay function of 500ms.
Step S804, is numbered by carry item, obtains carry item relevant information, verifies basic parameter information (that is, the IP, port, mount directory, server path, carry parameter etc. of carry item).If verification succeeds, forward step S806 to; If unsuccessful, forward step S802 to.
Step S806, judges that whether this mount point carry state is carry.If so, forward step S808 to, otherwise forward step S804 to.
Step S808, by accessing the nfscheck file of the client of carry, carrys out the state of Sampling network file system server.If access successfully, then illustrate server or the network equipment intact, forward step S810 to; Otherwise explanation server exception, forwards step S812 to and (in addition, also has a kind of situation to block exactly here, namely, can not backward reference success or failure, in this case, just need to carry out carry item corresponding to forced unloading by monitor processing module 76).
Step S810, setting data storehouse carry item state is available, carry item is checked counter clear 0, forwards step S802 to.
Step S812, setting data storehouse carry item state is unavailable, sends carry failure alarm, arranges carry state for non-carry, forwards S802 to.
Provide at this example a kind of method that NFS client detects server and network link status, that is, by arranging the state of this server, notice upper-layer service preferably other server providing services, ensures the seamless cutting of Consumer's Experience.
Example 3
Fig. 9 is the process chart of the monitor processing module according to example 3 of the present invention, as shown in Figure 9, in the step S808 of example 2, in network state unreachable or server and client disconnect time, state detection module 74 likely can block, function call is not returned, causes whole state-detection task blocking.So, add monitor processing module 76 for monitoring this state-detection task, so that whether this task of real time inspection has the situation of obstruction, if find to block, then call forced unloading function, step S808 is returned immediately, thus ensure that state-detection task can perform down smoothly.Particularly, the processing procedure of monitor processing module can comprise the following steps:
Step S902, task starts, and calls delay function (such as, time delay 1s).
Step S904, poll is carry information table, obtains the configuration information of the carry item of carry.
Step S906, verifies the configuration information (that is, the IP, port, mount directory, server path, carry parameter etc. of carry item) of carry item.If verify unsuccessful, forward step S 908 to, if success, then forward S910 to.
Step S908, adds 1 by mount point detection counter, forwards step S904 to, obtains next configuration information.
Step S910, judges whether mount point detection counter is greater than threshold values.If be greater than threshold values, forward S912 to, this mount point of forced unloading; Otherwise, forward step S908 to.
Step S912, forced unloading mount point, makes the state-detection task being blocked in step S808 place return immediately, to ensure normal operation.
Step S914, setting data storehouse carry item state is unavailable, sends carry failure alarm, and arranges carry state for non-carry.
Step S916, whether whether poll is complete to judge carry item information, that is, be last carry item.If not, forward step S904 to and obtain next carry information; If so, forward step S902 to, time delay is waited and is performed this task again.
In sum, embodiments provide a kind of ways and means detecting server and network link status in NFS device clients, namely, regular check is carried out to the state of network file system server and accessibility, and real-time status reports, and, after upper-layer service receives the state that network file system server reports, the mode of data or file access is carried out by the normal server of prioritizing selection state, ensure that stability and the controllability of upper-layer service, and, after the server that service can not be provided being detected, send alarm.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, and in some cases, step shown or described by can performing with the order be different from herein, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a detection method for network file system server, is characterized in that, comprises the following steps:
NFS client carries out carry according to data configuration to the network file system server that carry state is non-carry;
During carry success, creates the status checkout file corresponding with described network file system server, and the described carry state arranging described network file system server is carry;
Described NFS client periodically accesses described status checkout file; And
When accessing unsuccessfully, send alarm, and the described carry state of described network file system server is set for non-carry;
Wherein, described NFS client is periodically accessed described status checkout file and is comprised:
Described NFS client timer access and described carry state are the status checkout file that the network file system server of carry is corresponding;
When accessing continuous failed number of times and being greater than threshold value, the described carry state of unloading correspondence is the network file system server of carry.
2. method according to claim 1, is characterized in that, described NFS client is periodically accessed described status checkout file and also comprised:
In described network file system server fault or with in the inaccessible situation of the network of described network file system server, status checkout file failure described in described NFS client-access.
3. method according to claim 2, is characterized in that, described in described NFS client-access, status checkout file unsuccessfully comprises:
When described NFS client receives the described status checkout file failure of access or detects that blocking time exceedes scheduled duration, the described network file system server that unloading is corresponding.
4. method according to claim 1, is characterized in that, when accessing unsuccessfully, send alarm, and the described carry state arranging described network file system server comprises for non-carry:
The operating state arranging described network file system server is unavailable, and the state of more corresponding with described network file system server in new database blade.
5. the method according to any one of Claims 1-4, is characterized in that, described network file system server is multiple; Described NFS client is multiple.
6. a checkout gear for network file system server, is characterized in that, comprising:
First carry module, carries out carry according to data configuration to the network file system server that carry state is non-carry for NFS client;
First creation module, for when described first carry module carry is successful, creates the status checkout file corresponding with described network file system server;
First access modules, periodically accesses described status checkout file for described NFS client;
First alarm module, for when described first access modules is accessed unsuccessfully, sends alarm; And
First arranges module, and for when described first carry module carry success, the described carry state arranging described network file system server is carry; When described first access modules is accessed unsuccessfully, the described carry state of described network file system server is set for non-carry;
Wherein, described first access modules is also the status checkout file that the network file system server of carry is corresponding for described NFS client timer access and described carry state; And when accessing continuous failed number of times and being greater than threshold value, the described carry state of unloading correspondence is the network file system server of carry.
7. device according to claim 6, it is characterized in that, described first access modules also in described network file system server fault or with in the inaccessible situation of the network of described network file system server, status checkout file failure described in described NFS client-access.
8. device according to claim 6, it is characterized in that, described first access modules is also in described network file system server fault or with in the inaccessible situation of the network of described network file system server, when described NFS client receives the described status checkout file failure of access or detects that blocking time exceedes scheduled duration, the described network file system server that unloading is corresponding.
9. a NFS client, is characterized in that, comprising:
Second carry module, for being that the network file system server of non-carry carries out carry to carry state;
Second creation module, for when described second carry module carry is successful, creates the status checkout file corresponding with described network file system server;
Second access modules, for periodically accessing described status checkout file;
Second alarm module, for when described second access modules is accessed unsuccessfully, sends alarm; And
Second arranges module, and for when described second carry module carry success, the described carry state arranging described network file system server is carry; When described second access modules is accessed unsuccessfully, the described carry state of described network file system server is set for non-carry;
Wherein, periodically access described status checkout file to comprise: described NFS client timer access and described carry state are the status checkout file that the network file system server of carry is corresponding; When accessing continuous failed number of times and being greater than threshold value, the described carry state of unloading correspondence is the network file system server of carry.
10. a NFS, is characterized in that, comprises NFS client described in multiple claim 9 and multiple network file system server.
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| CN201010222761.3A CN101883028B (en) | 2010-06-30 | 2010-06-30 | Method and device for detecting network file system server |
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| CN108769246B (en) * | 2018-06-14 | 2021-02-02 | 苏州浪潮智能科技有限公司 | NFS sharing maximization test method and system |
| CN108804709B (en) * | 2018-06-22 | 2021-01-01 | 新华三云计算技术有限公司 | Method and device for processing lock management message of shared file system and server |
| CN109445709B (en) * | 2018-11-05 | 2022-09-20 | 郑州云海信息技术有限公司 | Method and device for managing storage resources in virtualization system |
| CN110059056A (en) * | 2019-04-18 | 2019-07-26 | 北京思特奇信息技术股份有限公司 | The distributed system read/writable detection method of multinode multifile, device, equipment |
| CN112187579B (en) * | 2020-09-28 | 2021-11-23 | 中国建设银行股份有限公司 | Auxiliary processing method, device and equipment for data transmission exception and readable storage medium |
| CN112783444A (en) * | 2021-01-18 | 2021-05-11 | 深圳市科思科技股份有限公司 | Cluster disk sharing method, system and storage medium |
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| US9942271B2 (en) * | 2005-12-29 | 2018-04-10 | Nextlabs, Inc. | Information management system with two or more interactive enforcement points |
| CN101567001B (en) * | 2009-05-22 | 2012-05-16 | 清华大学 | Method for managing metadata file layout of parallel file system |
| CN101707587B (en) * | 2009-09-21 | 2012-11-21 | 北京星网锐捷网络技术有限公司 | Method, device and Radius server used for detecting client connection status |
| CN101699825B (en) * | 2009-10-28 | 2013-01-02 | 成都市华为赛门铁克科技有限公司 | Network file system access method, device and system |
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