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  • 1.  to create concurrent I/O filesystem in aix 5.3

    Posted Fri November 21, 2008 10:08 PM

    Originally posted by: apple08


    dear all,
    would appreciate yr comments on my understanding on the concurrent I/O filesystem creation in AIX:
    user requirement: 500GB for db2 extraction

    1. create 5 LUN of 100GB from SAN storage

    2. create one vg on one of the hdisk, and then extend the 4 disk to the vg
    where to specify the concurrent IO?

    3. vi /etc/filesystems
    ensure the option:
    options = cio,rw

    hope to hear from you. thank you
    #AIX-Forum


  • 2.  Re: to create concurrent I/O filesystem in aix 5.3

    Posted Sun November 23, 2008 05:22 AM

    Originally posted by: apple08


    i tried to find in redbook. but can't find. how to stripe accross hdisk. hope to hear from you. thank you
    #AIX-Forum


  • 3.  Re: to create concurrent I/O filesystem in aix 5.3

    Posted Mon November 24, 2008 05:28 AM

    Originally posted by: hdkutz


    Hello,
    to stripe across the hdisks simply use
    mklv -e x ...
    in your mklv command, which spreads the LP's over as much disks as available.

    Cheers,
    ku
    #AIX-Forum


  • 4.  Re: to create concurrent I/O filesystem in aix 5.3

    Posted Mon November 24, 2008 06:18 AM

    Originally posted by: tony.evans


    > hdkutz wrote:
    > Hello,
    > to stripe across the hdisks simply use
    > mklv -e x ...
    > in your mklv command, which spreads the LP's over as much disks as available.

    That's not striping. You create striped LV's using mklv -S
    #AIX-Forum


  • 5.  Re: to create concurrent I/O filesystem in aix 5.3

    Posted Mon November 24, 2008 10:15 AM

    Originally posted by: hdkutz


    Hello Tony,
    thanx for the hint - you are right.
    I thought spreading lp over all my disks in a VG would have the same or similar effect.
    Using the mklv -e x command for example for 10 LP'sa VG with 5 Disks would result in the following:
    Disk1 Disk2 Disk3 Disk4 Disk5
    lp1 lp2 lp3 lp4 lp5
    lp6 lp7 lp8 lp9 lp10

    Isn't that some kind of striping?

    Cheers,
    ku
    #AIX-Forum


  • 6.  Re: to create concurrent I/O filesystem in aix 5.3

    Posted Mon November 24, 2008 11:04 AM

    Originally posted by: tony.evans


    > hdkutz wrote:
    > I thought spreading lp over all my disks in a VG would have the same or similar effect.
    > Using the mklv -e x command for example for 10 LP'sa VG with 5 Disks would result in the following:
    > Disk1 Disk2 Disk3 Disk4 Disk5
    > lp1 lp2 lp3 lp4 lp5
    > lp6 lp7 lp8 lp9 lp10
    >
    > Isn't that some kind of striping?

    No, it's not striping. Also, I don't think AIX will do what you drew above, I think it will do this,

    Disk1 Disk2 Disk3 Disk4 Disk5
    lp1 lp3 lp5 lp7 lp9
    lp2 lp4 lp6 lp8 lp10

    It's safer to only talk about striping with LVM when you're creating specific striped LV's using -S.

    Striping creates a unit smaller than the PP (usually) and ensures writes go to all disks at the same time. Choice of stripe size is critical and based on the application in question.
    #AIX-Forum


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