File store high availability considerations

High availability refers to the capability of failing over messaging engines between servers. File stores can be used in highly available environments.

You can achieve high availability by choosing a file store as the message store of a messaging engine. In order to make a file store highly available, you should use hardware or software facilities to maximize the availability of the file store data, for example, SAN.
Note: It is important to ensure that the directories containing the log file and store files are universally accessible with the same directory name from all members of the cluster.

[Updated in December 2011] You can test whether a shared file system can support the failover of messaging engines by running the File System Locking Protocol Test for WebSphere® Application Server. To run the test see, IBM File System Locking Protocol Test for WebSphere Application Server. [Updated in December 2011]

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WebSphere Application Server Version 6.1 supports two styles of file system access to enable this:

Note: It is important to check that the file system configuration is correct, because it cannot be checked by the WebSphere configuration system or messaging engine. Errors only surface at runtime, so thorough failover testing is recommended.
Further information:
These considerations for enabling access to the file store's directories are similar to those for enabling access to the recovery log in a cluster. For more information see the following article: Transactional high availability and deployment considerations in WebSphere Application Server Version 6



Related concepts
Learning about file stores
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