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Striped logiv volumes OR multiple volumes

Discussion in 'Performance Tuning' started by steven.langdale, Feb 1, 2007.

  1. steven.langdale

    steven.langdale New Member

    Oct 16, 2002
    Likes Received:
    Hello all

    I'd appreciate a bit of advice :)

    I'm creating a new disk pool (AIX 5.3 TSM server) and have four drives to put it on.

    Would I get better performance by striping one logical volume across all the disks and using that to create one TSM volume OR creating four logical volumes (one on each disk) and one TSM volume on each?

    I suppose the question is, does TSM use disk volumes in a parallel fashion and therefore negate the need for me to stripe the logical volume?

    This stgpool will have multiple clients sending data to it.

    Many thanks

  3. hakanen

    hakanen New Member

    Sep 23, 2002
    Likes Received:
    Storage consultant
    Gothenburg, Sweden
    You should first of all activate asyncrous I/O, mount filesystem with Direct IO option and set the directio option to yes in dsmserv.opt, this will get you really good performance regardless if you stripe over all disks or creates separate volumes. I'd go for separate volumes since TSM spreads it's writes evenly over all stgpool volumes (When stgpool volume is type DISK, Sequential writes to volumes of type FILE will not spread).


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