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Re: [linux-lvm] Different sizes being reported for logical volume after extend



I finally managed to solve my problem.

After some fiddling around with resize2fs, with which I changed the size of the root partition back and forth between 4GB and 8GB a couple of times, I actually ended up with the initial situation in which I again saw that the size of /dev/VolGroup00/LogVol00 was 4GB when booting from disk. So I started thinking, maybe the metadata is wrong somehow (even though it looks right when booting with the rescue CD). I tried to run "lvm vgcfgrestore VolGroup00", but could not do that because I got a "Locking type 1" failure.

When I booted from the rescue CD, "lvm vgscan" followed by "lvm lvs" showed 8GB. Then I tried successfully to run "lvm vgcfgrestore VolGroup00". When I rebooted from disk again, the problem was solved!

I can't really say that I understand what was going on, why "lvm lvs" showed different results when booting from disk or the rescue CD. Maybe one of you knowledgeable people can offer an explanation?

Thanks,
Magnus

Magnus Hyllander wrote:
Hi,

I've been trying to solve this problem on my own but without success. One thing has changed though, and that is that the size of the logical volume is now 8GB both when I boot from the disk and from the rescue cd. So at least the logical volume seems to be alright now. But fsck still complains that the "device" is half the size of the file system. What "device" is fsck looking at, and why is the size wrong? I'd really appreciate some help!

Thanks,
Magnus

Magnus Hyllander wrote:
 Hi,

I have a little problem with a logical volume: in short, the size of the volume is different depending on if I boot from the FC5 rescue CD or from the installed FC5.

I have two mirrored disks. On the mirror I have created a logical volume /dev/VolGroup00/LogVol00 which contains the root filesystem. Initially I made the volume 4GB. Later I needed more space, so I decided to extend the volume to 8GB. I booted from the FC5 rescue CD and ran the following commands:

   dmraid -a y
   lvm vgscan
   lvm vgchange -a y
   lvm lvextend -L +4G /dev/VolGroup00/LogVol00
   fsck /dev/VolGroup00/LogVol00
   resize2fs /dev/VolGroup00/LogVol00

So far so good. Then I rebooted the system from disk and got the following error:

   Checking filesystems
   /dev/VolGroup00/LogVol00: The filesystem size (according to the
   superblock) is 2097152 blocks
   The physical size of the device is 1048576 blocks
   Either the superblock or the partition table is likely to be corrupt!

   /dev/VolGroup/LogVol00: UNEXPECTED INCONSISTENCY, run fsck manually.

I entered the system administration mode and checked the size of /dev/VolGroup/LogVol00 with "lvm lvs": 4.00G Strange... so I booted with the rescue CD again and checked the size once more from the rescue environment: 8.00G.

So it seems that when I boot the system normally it doesn't "see" that the size of the logical volume has changed. Can someone explain this, and hopefully help me fix the problem?

/Magnus

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