Re: shrinking lvm
From: Paul Howarth (paul_at_city-fan.org)
Date: 03/21/05
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Date: Mon, 21 Mar 2005 11:50:28 +0000 To: For users of Fedora Core releases <fedora-list@redhat.com>
gaurav wrote:
> Hi Paul,
> I think logical partition will suffice for oracle installation,
I think you're confusing "Logical Volume" with "Logical Partition". See
http://www.tldp.org/HOWTO/LVM-HOWTO/ for an explanation of LVM.
> Here is info you asked for
>
> # vgdisplay
> --- Volume group ---
> VG Name VolGroup00
> System ID
> Format lvm2
> Metadata Areas 1
> Metadata Sequence No 3
> VG Access read/write
> VG Status resizable
> MAX LV 0
> Cur LV 2
> Open LV 2
> Max PV 0
> Cur PV 1
> Act PV 1
> VG Size 38.16 GB
> PE Size 32.00 MB
> Total PE 1221
> Alloc PE / Size 1220 / 38.12 GB
> Free PE / Size 1 / 32.00 MB
> VG UUID xmHw2k-SVQS-lnIQ-u0z5-8E9E-vHAy-YEYXj4
Right, so there's virtually no free space in your existing LVM setup,
which means you'll need to shrink an existing volume.
> # lvscan
> ACTIVE '/dev/VolGroup00/LogVol00' [37.12 GB] inherit
> ACTIVE '/dev/VolGroup00/LogVol01' [1.00 GB] inherit
>
> # df
> Filesystem 1K-blocks Used Available Use% Mounted on
> /dev/mapper/VolGroup00-LogVol00
> 38317560 14124468 22246676 39% /
> /dev/hda1 101086 9125 86742 10% /boot
> none 257336 0 257336 0% /dev/shm
> //172.28.62.169/m 31312896 17075712 14237184 55% /opt/music
A fairly simple setup then, with just a "/" volume that has 22GB free.
What I would suggest is the following:
1. Boot using the rescue CD and do not mount your system's partitions
(or unmount them afterwards).
2. Shrink your existing root filesystem using resize2fs. I would suggest
shrinking it to a size of around 16GB (i.e. just bigger than the amount
of space you're actually using).
3. Shrink your root logical volume (/dev/mapper/VolGroup00-LogVol00)
using lvreduce to the size you actually want it to be (i.e. 37.12GB less
the space you're going to allocate for Oracle). The size should be
greater than the size you shrunk the root filesystem to in step 2.
3. Grow your existing root filesystem back to the full size of the
volume it lives on, using "resize2fs /dev/mapper/VolGroup00-LogVol00".
At this point you will have a reduced size root partition, with extra
space left in VolGroup00 that can be used to create logical volumes for
Oracle's use.
You can use lvcreate to create the two additional volumes you require.
What filesystems, if any, do you want to use for the two new volumes?
Look at the man pages for each of the commands referenced above and
write down the commands you intend to use. Be sure that you understand
what you're doing, as a mistake can trash your system, requiring a
re-install.
Paul.
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