Re: Adding free PPs in AIX

From: steven_nospam at Yahoo! Canada (steven_nospam_at_yahoo.ca)
Date: 11/25/05

  • Next message: steven_nospam at Yahoo! Canada: "Re: install characters on aix" 
    Date: 25 Nov 2005 07:38:50 -0800

    A PP is a Physical Partition. It is similar to a cluster or a sector on
    a Windows hard disk.

    There are a set amount of PPs based on

    1) The hard disks that you have assigned to the volume group
    2) The initial PP Size you selected for the volume group

    In the rootvg info that you showed, I see that you have one hard disk
    (TOTAL PVs = 1), and it is a 36 GB drive.

    To get more PPs, you would need to add a second hard disk and include
    it as part of rootvg. That would give you more room to store data.

    Of course, since you have 503 FREE PPs right now out of a possible 542,
    I don't think you necessarily need more disk space. FREE PPs are
    essentially disk space that has not been assigned to any purpose.

    What you may be looking for is a way to increase the size of your
    logical volumes or your file systems within the rootvg area. If that is
    the case, you should be looking at the info that Hajo suggested in his
    message.

    Logical volumes (LVs) let you protect disk space and prevent someone /
    something from increasing the file system to an unreasonable size. File
    systems are current assigned space for a particular directory or
    structure.

    For example:

    I can set my LV to limit it to allow it to only use a maximum of 4
    physical volumes, to use the maximum number of disks when storing data
    (spread accross the disks evenly), and to never allow it to use up more
    than 128 PPs. Check out " smit chlv " or "smit lvm " to see some of
    these options.

    I can then increase my File System ( smit chfs ) as often as I want to
    give it more space until I reach that restriction on my logical volume.
    Once that happens, you will get error messages indicating why you
    cannot increase its size.

    Also, keep in mind that on some versions of AIX, you cannot reduce the
    size of a file system, only increase it. To reduce it, you may have to
    back up the data, delete it, recreate the file system smaller, then
    reload your data.

    Hope this answers some of your questions...

    Steve

  • Next message: steven_nospam at Yahoo! Canada: "Re: install characters on aix"

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