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Change the queue_depth of Virtual SCSI Disk hdisk6 to 16 (from 3) in AIX 5300-05-06

  • 1.  Change the queue_depth of Virtual SCSI Disk hdisk6 to 16 (from 3) in AIX 5300-05-06

    Posted Tue September 25, 2007 07:02 AM

    Originally posted by: lion55


    These are below steps am following .Please correct me If i am wrong.

    hdisk6 has some logical volumes.

    1. unmount <all the filesystem on the PV hdisk6>

    2.varyoff <VG which hdisk6 belongs to>

    I have little confusion in step3.please advise me.
    3.rmdev -d -l hdisk6 (OR) rmdev -l hdisk6

    -d will remove the Customized Devices object class definition
    -l will unconfigure the device

    4.change queue_depth to 16

    5. varyonvg

    Thanks in advance

    #AIX-Forum


  • 2.  Re: Change the queue_depth of Virtual SCSI Disk hdisk6 to 16 (from 3) in AIX 5300-05-06

    Posted Wed September 26, 2007 07:48 AM

    Originally posted by: SystemAdmin



    Hi,
    I changed queue_depth of SCSI hdisk4 and hdisk5 to 32 in AIX 5300-05 yesterday.

    Steps:

    1. umount /ora1 <the filesystem on the PV hdisk4 and hdisk5>
    2. umount /ora2 <the filesystem on the PV hdisk4 and hdisk5>
    3. varyoff oravg
    4. chdev -l hdisk4 -a queue_depth=32
    5. chdev -l hdisk5 -a queue_depth=32
    6. varyonvg oravg
    7. mount /ora1
    8. mount /ora2
    9. shutdown -r now

    after reboot,you can check queue_depth parameters of hdisks by using below command.

    #lsattr -El hdisk?
    #AIX-Forum


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