Problem running fsck on LVM
I'm trying to manually run fsck on my Fedora 8/Windows XP dual-boot machine (Dell Inspiron 6000), on which the Fedora install is hosed in some mysterious way. I don't think I understand how to do this correctly, since I am running into the following situation:
I insert the F8 rescue CD and boot up. When asked whether I want to mount the filesystem, I choose 'Skip' and go straight to a command line. I want to run
>fsck -c /dev/mapper/VolGroup00-LogVol00 (I believe this is correct.)
However, because I haven't mounted the filesystem, there is no 'VolGroup00-LogVol00' in /dev/mapper.
If I instead boot from the rescue CD and choose to mount the filesystem in /mnt/sysimage, an entry for VolGroup00-LogVol00 appears in /dev/mapper. However, running the above command gives the following warning:
WARNING: couldn't open /etc/fstab. No such file or directory.
/dev/mapper/VolGroup00-LogVol00 is mounted.
WARNING!!! Running e2fsck on a mounted filesystem may cause SEVERE filesystem datage. Do you really want to continue(y/n)?
I of course choose no. I understand that one shouldn't run fsck on a mounted filesystem, but how do I run it on an unmounted filesystem from the rescue CD???
Many thanks in advance for any advice.
you can either a) umount the mounted LVs under /mnt/sysimage
or b) bring up the LVM after saying 'no' to finding and mounting filesystems
if b), then
fsck /dev/VolGroup00/LogVol00 (or whatever the device name ;))
Hope this helps.
Thanks - option b solved my problem nicely.
As a simple workaround for those weary of picking the right PVs:
As root (or user allowed to shut down the box) type at a console "shutdown -r -F now". That'll perform an immediate reboot with a forced file system check (-F option) for all partitions and you can watch the results during boot...
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