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Re: [Xen-users] what's correct way of shrinking LVM based domU?

To: Rudi Ahlers <Rudi@xxxxxxxxxxx>
Subject: Re: [Xen-users] what's correct way of shrinking LVM based domU?
From: John Haxby <john.haxby@xxxxxxxxxx>
Date: Tue, 24 Jun 2008 16:57:35 +0100
Cc: xen-users <xen-users@xxxxxxxxxxxxxxxxxxx>, Jean Charles Delepine <delepine@xxxxxxxxxxxxx>
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Rudi Ahlers wrote:
Jean Charles Delepine wrote:
Rudi Ahlers <Rudi@xxxxxxxxxxx> écrivait (wrote) :

This is what I have:

[root@cPanel002 ~]# [root@HF-LINSRV01 ~]# lvscan
 ACTIVE            '/dev/data/cpanel002' [100.00 GB] inherit
 ACTIVE            '/dev/data/windows2003_web' [30.00 GB] inherit
 ACTIVE            '/dev/data/storage' [50.00 GB] inherit
 ACTIVE            '/dev/data/cacti' [20.00 GB] inherit
 ACTIVE            '/dev/data/cpanel2' [30.00 GB] inherit
 ACTIVE            '/dev/system/root' [39.06 GB] inherit
 ACTIVE            '/dev/system/swap' [9.75 GB] inherit


I need to resize the 100GB /dev/data/cpanel002

1) shutdown the domu : xm shutdown 'name of domu'
   wait for the domu to be shutdown  (xm list)
2) reduce the filesystem :    If it's ext3 :
      e2fsck -f -y /dev/data/cpanel00
      resize2fs -p /dev/data/cpanel00 90G
3) reduce the logical volume :
      lvreduce -L 90G /dev/data/cpanel00

4) restart the domu.

              Jean Charles
I don't think those commands will work on ext3

[root@HF-LINSRV01 i386]# e2fsck -f -y /dev/data/cpanel002
e2fsck 1.39 (29-May-2006)
Couldn't find ext2 superblock, trying backup blocks...
e2fsck: Bad magic number in super-block while trying to open /dev/data/cpanel002

The superblock could not be read or does not describe a correct ext2
filesystem.  If the device is valid and it really contains an ext2
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:
   e2fsck -b 8193 <device>


That's because /dev/data/cpanel002 isn't a file system, it's a disk image. Run "kpartx /dev/data/cpanel002" to see what partitions there are.

jch


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