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Question about pool creation

  • 1.  Question about pool creation

    Posted Sat October 28, 2023 03:46 PM

    Hello fellows.

    I'm testing GPFS on lab environment for learning purposes. I have created

    the cluster with a system pool of Id zero and successfully

    created up to five NSD devices and FS related. Now I'm playing

    with the concept of another pools and, AFAIK, new pools are created with the first

    FS on such new pool with the mmcrfs command and corresponding stanza file.

    However I'm unable to create a new pool. in fact the FS is created in system pool.

    I'm using the following stanza file

    Please your help.

    TIA



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    Cesar Daniel Delgado Ponce
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  • 2.  RE: Question about pool creation

    IBM Champion
    Posted Mon October 30, 2023 10:23 AM

    Hallo Cesar,
    please check at first your stanza file. GPFS has five usage designation for defining NSDs. A FS can have 8 Storagepools (1 system and 7 datapools).
    Here are the desription:

     dataAndMetadata
                               Indicates that the disk contains both
                               data and metadata. This is the default
                               for disks in the system pool.

                      dataOnly
                               Indicates that the disk contains data
                               and does not contain metadata. This is
                               the default for disks in storage pools
                               other than the system pool.

    If you want to define other pool than the systempool you must define NSD as dataOnly. And don't forget after you create the FS a placement policy vor this FS like this at first:
    RULE 'default' SET POOL 'data01' 
    data01 is here the name of a dataOnly Pool.
    Regards Renar



    ------------------------------
    renar Grunenberg
    HUK Coburg
    Coburg
    ------------------------------