Increase capacity of the shared disk

Discussion in 'Clustering' started by j05e, Dec 1, 2004.

  1. j05e

    j05e Guest


    I have a 2-node cluster with a shared disk. I formed a RAID1 with 2 hard
    disks of 36GB. I need to increase the capacity of the shared disk, so I have
    thought to buy 2 new hard disks of 36 GB. The cluster model is HP DL380
    Packaged cluster with the MSA500 Smart Array7 Controller. To expand the RAID
    I am going to use the HP Array Configuration Utility; I have read in the
    tutorial that the expansion process takes 15 minutes per gigabyte. Does it
    mean 15 min multiplied by 36 GB or by 72 GB?
    The other question is: should I stop the cluster service in both nodes, so
    there is no activity in the shared disk, during the expand process? It would
    mean I should stop my cluster 10 or 20 hours?

    Thank you very much for your time
    j05e, Dec 1, 2004
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  2. j05e

    Dakl Guest


    You don't need to stop cluster service. While expanding RAID you'll get some
    performance degradation (depending on RAID controler settings degradation
    level can vary) so it is better to plan to start this process during hours
    with less load for the system.
    Also keep in mind that RAID controler will extend only array and Logical
    Drive on your storage. OS will see shared disk with additional unused space
    after extension will be finished.

    Dakl, Dec 3, 2004
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  3. j05e

    j05e Guest

    Thank you very much for your answer.

    I am going to do the expansion bynight, but I am going to expand the RAID
    but no the logical drives because I have read in the HP Array Configuration
    User Guide that it is not recommended doing this when you use Windows 2003
    and MSCS. The reason is that in the Logical Drive Capacity Expansion process
    the drives have to be configured as dynamic and MSCS required the disks as
    basic. I wopuld create new logical drives.

    Thank you again.
    j05e, Dec 3, 2004
  4. j05e

    Dakl Guest


    It depends what you are calling Logical Drive.
    If this is Logical drive used in windows OS context (or partition in other
    words) - then yes, you can not expand it as MS clustering does not supports
    dynamic disks.
    I was talking about Logical Drive in HP Smart Array context (or you can call
    it LUN if you like). And in this context MSA controlled at first will extend
    array (disk group) and after that will extend logical drive (LUN). And after
    LUN extension will be completed your operating system will see free space on
    windows "physical" drive.

    Dakl, Dec 3, 2004
  5. j05e

    j05e Guest

    Thank you again. You have really helped me to clear my ideas. I made a
    mistake when I read Logical drives in the HP Smart Array Tutorial. I thoughy
    I couldn't expand the LUNS.
    So I will espand the RAID where I have three LUNS (the first one is the
    quorum and the others are for the database). Once the RAID is expanded I wiil
    espand the LUNs.

    Thank you
    j05e, Dec 9, 2004
  6. j05e


    Sep 7, 2010
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    abcmei, Sep 7, 2010
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