Re: ??: Disks used by LV

From: Green, Simon (Simon.Green_at_EU.ALTRIA.COM)
Date: 07/22/04

  • Next message: Green, Simon: "Re: Power 5 servers" 
    Date:         Thu, 22 Jul 2004 13:09:18 +0200
To: aix-l@Princeton.EDU

    You might just as well do the "extendlv" for the full amount - remaining
    space on hdisk1, plus what you need on hdisk2 - then do a single chfs for
    the full amount.
    You might find this trivial script handy:

    #!/bin/ksh
    #
    # Increase the size of a filesystem to that of its logical volume.
    #
    Filesystem=$1
    lsfs -q $Filesystem |tail -1|awk {'print $3 $6'} | tr ',' ' ' |read LV_Size
    FS_Size
    if [ $LV_Size -ne $FS_Size ]
    then
     chfs -a size=$LV_Size $Filesystem
    else
     echo Filesystem already uses all of Logical Volume.
    fi

    Do the extendlv, then just run the script. Saves you having to worry about
    the number of blocks.

    If you're going to do a lot of this sort of thing, I would recommend you
    change your intra-disk allocation policy from the default of "outer-middle"
    to "outer-edge". This helps keep the LV contiguous, which can aid
    performance and may make future maintenance easier. 

    --
Simon Green
Altria ITSC Europe Ltd
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-----Original Message-----
From: Kumar, Praveen (cahoot) [mailto:Praveen.Kumar@CAHOOT.COM]
Sent: 21 July 2004 15:59
To: aix-l@Princeton.EDU
Subject: Re: ??: Disks used by LV
Hi Holger,
Since it is possible with extendlv, let me know if these steps are correct.
In fact I have tried increasing the LV and then increase the FS which was
through.But this machine had only one disk.
Data
fs01 current size     5GB
hdisk1 size             18GB
Proposed fs01 size 20GB
Preferable disk for 2GB extra space is hdisk2
PP Size                 32MB
What I would do is
*       chfs -a size=+27262976   // (13*1024*2048) I Increase the file
system fs01 by 13GB using chfs which would use the free space on hdisk1. Now
the size of the file system is 18GB
*       extendlv lv_fs01 64 hdisk2   // 64*32=2048MB=2GB
*       chfs -a size=+4194304  // Increase the file system fs01 by adding
4194304 (2*1024*2048) to the existing value.
With the above steps I should have allocated the disk space of 2GB from my
desired disk(hdisk2).
Pl correct me if I am wrong.
  • Next message: Green, Simon: "Re: Power 5 servers"

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    • Re: Disks used by LV
      ... If you are concerned about disk placement, you must do an extendlv, ... If you just do a chfs LVM will decide which disk to extend onto and you ... cahoot does not accept liability for any such ... If you wish to confirm the origin or content of this communication, ...
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    • Re: Disks used by LV
      ... If you are concerned about disk placement, you must do an extendlv, ... If you just do a chfs LVM will decide which disk to extend onto and you ... > these IO intensive FS's should go and occupy the free space ...
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