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

Magnus Hyllander mhylist1 at hyllander.org
Mon Jan 15 22:41:46 UTC 2007


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!


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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