On 7/4/12 2:59 AM, Bram Mertens wrote:
On Tue, Jul 3, 2012 at 10:03 PM, Bob Cochran<[email protected]> wrote:
I ran out of space for my cobbler repos in my CentOS 6.2 home for cobbler.
Specifically, the default CentOS install allocates only 50 GiB of space for
the LVM filesystem /dev/mapper/*/lv_root, which is mounted on /, and I
needed more of that. Since /opt comes under this, it was as empty of space
as /var. So this meant using lvm commands to resize *lv_root and add space
to it. I got into trouble with this unfortunately.
Stuart suggested using 'lvextend' and 'lgextend' and perhaps I should have
researched that more. Instead, I found this how-to and followed it:
http://www.how2centos.com/centos-lvm-resizing-guide/
I robbed 1.2T of space from /dev/vg_cobbler1/lv_home using 'lvresize' and
got these messages:
lvresize -L -1.2T /dev/vg_cobbler1/lv_home
rounding up size to full physical 1.20 TiB
..
reducing logical volume lv_home to 577.98 GiB
Then tried putting this space into /dev/vg_cobbler1/lv_root:
lvresize -L +1.2T /dev/vg_cobbler1/lv_root
rounding up size to full physical extent 1.20 TiB
Extending logical volume lv_root to 1.25 TiB
Insufficient free space: 314573 extents needed but only 314572 available
what is this trying to tell me? And how do I fix it? Have I ruined the
filesystem(s) at this point?
Should I have used 'lvextend' as suggested by Stuart, instead?
The story will continue with what I did after this, but I would like to stop
here and see what those of you more expert than me think.
Thanks
Bob
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Bob,
At first glance the problem of following that particular guide is that
it describes how to resize a SWAP partition. The difference between a
SWAP partition and your home directory is that swap doesn't need a
file system so resizing the partition is all that is needed.
But your home partition contains a filesystem.
To exted you need to resize a partition then resize the filesystem, to
reduce you need to reduce the filesystem *first* then resize the
partition carefully so the filesystem still fits on the reduced
partition.
Now if you did not make any other changes chances are you can still
recover from this. You're system appears to be in an invalid state
witht eh filesystem larger than the partition. But as far ar I know
it can still work.
First of all backup your data before you make any more changes!
This is really important so I'll repeat: create a backup and verify it
on a different system.
Then I'd suggest to resize the partition back to it's original size.
Then reduce the size of the filesystem first and then reduce the size
of the partition again.
The basic instructions are available at
http://tldp.org/HOWTO/LVM-HOWTO/reducelv.html but it is very brief. A
longer guide is available at
http://www.tcpdump.com/kb/os/linux/lvm-resizing-guide/shrink.html.
Good luck
Bram
Bram and Ramon,
Thank you very much for your help with this. I understand my mistakes
better now. I do have a complete backup of my CentOS system: I cloned
the entire hard drive to a spare hard drive, and then did all my
resizing work from the spare drive. So the original system drive is
untouched.
It is extremely rare for me to need to do LVM resizes. I think I've done
only one before, a few years ago. After making the above mistakes
yesterday (and actually making them a lot worse by using resize2fs on
*lv_root) I decided to simply reinstall CentOS 6.2 on that hard drive,
reinstall cobbler and its dependencies, and get the partition sizing
correct from the start.
I think the Cobbler installation instructions need to contain a note
that on CentOS systems which are using LVM, the root partition isn't
going to get enough space in a default installation, so an LVM resize
will be needed or even a reinstall of CentOS. I didn't understand this
clearly until James pointed it out to me -- that on my system /var had
run out of space. It is a lot easier to get the OS partitioned correctly
before one is well into using cobbler.
Since I do have the original system drive, I will practice an LVM resize
on that. I can see myself needing to work with LVM much more in the future.
Thanks!
Bob
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