XFS device-mapper problem

Hello,

Recently I attemped to 'lvextend' a logical volume. My fatal error was that I had a typo in my prior 'vgextend' command in which I added /dev/sda to a volume that already held /dev/sda1. One the device for the disk (sda) and the other being the device for the only partition on the disk (sda1). Oh no!

I recieved the following error during the 'lvextend' command... lvm> lvextend -L+1G /dev/Volume00/LogVol00
Extending logical volume LogVol00 to 2.93 TB device-mapper ioctl cmd 9 failed: Invalid argument Couldn't load device 'Volume00-LogVol00'.
Problem reactivating LogVol00

I have since 'lvreduce'd the logical volume back to its original size and 'vgreduce'd the volume by removing /dev/sda from the volume. Both of these commands ran well without any noticable errors.

However my problem is that I believe I have corrupted the block device located at /dev/mapper. The block device in that directory is Volume00-LogVol00. The filesystem is XFS. When I run xfs_check on the filesystem I recieve the following error:
xfs_check /dev/Volume00/LogVol00
xfs_check: /dev/Volume00/LogVol00 is invalid (cannot read first 512 bytes)

When I run:

# hexdump -C Volume00-LogVol00
#
It simply returns nothing except a prompt.

The directory listing looks like:

# pwd
/dev/mapper
#ls -l
crw-------  1 root root  10, 63 Nov 22 12:05 control
brw-------  1 root root 253,  1 Jun 17  2003 Volume00-LogVol00
brw-------  1 root root 253,  0 Nov 22 10:03 Volume01-LogVol00

Volume01 is a working block device while Volume00 seems to have stopped working.

I can 'hexdump' /dev/sda1, the physical volume device in Volume00, and it shows me the content of the filesystem (phew, still there).

How do I fix LVM and device-mapper to make this work again?

Thanks,
Frank

Frank J. Buchholz

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