Run fsck on a XenServer Virtual Machine

Rob —  June 11, 2013 — 2 Comments

You hope that you won’t ever need to, but you may one day need to run fsck on a Linux XenServer VM that won’t boot.. no worries, attach the storage from that VM on another VM and run it from there!

Let’s set it up with VM1 and VM2, where VM1 is the one that you need to run a manual fsck on.

1. Shut down VM1 (if it’s not down already..)
2. Enter the console on the xenserver and list the VMs – grab the vm-uuid of VM2.

3. Now get the vdi-uuid of the vdi you want to access:

4. Create the vbd – it will echo the vbd-uuid after this command:

5. Now, ‘plug’ it in to VM1

You should now see a new partition in /proc/partitions

When you’re done with it, unplug the vbd:

Then you can destroy the temporary vbd:

Added 3/24/2014:
If you’re trying to run fsck on an LVM volume, then you’ll need to activate it first, otherwise you’ll get a bad superblock error.. and it won’t fsck correctly.

First, find out what the name is for your lvm’s volume group:

Next, activate it:

Next, run fsck on it, automatically fixing the errors:

When finished, deactivate it:

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2 responses to Run fsck on a XenServer Virtual Machine

  1. Great and detailed guide, thanks! As you said I hope I won’t ever need to do this but if I do I have bookmarked this post just incase.

  2. Yes! This is another one for my server maintenance cheat sheet. Unfortunately, Murphy’s Law is a very active part of my life, so I appreciate having this resource for “just in case”. Thanks!

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