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2 Replies Latest reply: Dec 6, 2012 7:47 AM by 978127 RSS

disk confguratiob for jms auto migration

978127 Newbie
Currently Being Moderated
Hi,

We are using cluster of weblogic 11g on Linux. currently we are not using shareable disk.

We are about to to use auto-migration of jms. can you please elaborate on what is the restriction in regard to the shareable disk.

- can we use NFS ?

- what about locking ?

Do you have other recommendation ?

Thank you,
Amit
  • 1. Re: disk confguratiob for jms auto migration
    Tom B Expert
    Currently Being Moderated
    Hi,

    There are two levels of locking with respect to migration and file stores. The first is that the WebLogic migration leasing machinery ensures that only one instance of a particular store can run at a time in a cluster. The second is that the file store itself uses "fcntl" to lock the file itself, so, in the event that two store instances, from say two different domains, attempt to open the same file, the problem is detected and second instance is locked out. You should rarely see the second check fire off in practice - it's mainly intended to guard against administrative error.

    Your question about NFS is a good one. It's only recently (within the last few years) that NFS has become stable enough for WebLogic to consider it as "enterprise" safe, and, and I'm not sure if this extends to all vendors and all versions. It's definitely helpful if you can use NFS v4, as the NFS v3 standard's file locking support has problematic limitations. Also, it's absolutely required that your NFS mounts/servers be configured to properly support safe synchronous writes (otherwise data is likely to be lost in the event of a crash or hardware failure).

    There's information about NFS in the store tuning documentation (http://docs.oracle.com/cd/E21764_01/web.1111/e13814/storetune.htm#CACFDGCA).


    HTH,

    Tom
  • 2. Re: disk confguratiob for jms auto migration
    978127 Newbie
    Currently Being Moderated
    Hi Tom,

    Thank you.

    Since we are using different file store for each jms server, there shouldn't be locking issues.

    Regards,
    Amit

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