Re: [Qemu-block] [Qemu-devel] Please help corrupt filesystem image

[Alexander Marx]

Thank you for replying.
Well i am using latest PROXMOX in a cluster of 4 physical servers.
during the weekend i had to stop all hosts because electricians had to work on the fuse box.

i shutted down all vm's then powered off all physical hosts. One of them took very long.
this host had a raid5 of 27 TB on it (XFS) where some vm images were saved.

i waited long time but i knew that at weekends the raid does a patrol read. So i switched that host hard off.

After rebooting, all hosts and nearly all vms came back online without problems. only these two images could not be started.
As i told before, they were not critical as they were part of a new domain which was not used in productuction.

Then i found out that the XFS Filesystem has problems. i stopped all vm's again and did a xfs_check on that storage.
Some Errors were correted which causes 2 other vm's to die.

These vm's i could restore from backup, so no problem. The other 2 Win216 servers i had to delete and install new.
Thank you very much for your interest on my problem.
It is solved.

Have a nice week and please go on developing that great piece of software!

Am 18.02.19 um 21:54 schrieb John Snow:

On 2/16/19 10:54 PM, Alexander Marx wrote:

Dear List!

I have a big problem and hope you can help me.
I built a new windows 2016 domain with virtual servers. 2 dc and 9 rds
hosts.
I was nearly finished with the setup and ready to migrate the users from
old to new domain.

Then i had to restart the physical servers. Unfortunately 1 dc and 2 rds
hosts could not be startet anymore.
Error says:

qemu-img: Could not open 'vm-150-disk-0.qcow2': Could not read qcow2
header: Input/output error

Even worst, a qemu-img check  also gave that error. and i was not able
to do anything i found in the internet to fix it.
always that error or the qemu-img could not determine the format.

Is there a chance to fix these images? What can i do?

I have no backup because the domain was not fully configured. But if i
have to rebuild the whole domain, i will need several weeks for it.
Any help is appreciated.

Thank you

Alex

What versions of QEMU were you running?
What filesystem were these images stored on?
What happened at the time of the corruption, is there some detail that
might help explain the nature of the corruption? Did you shut down the
physical host while the VMs were still running?

There may not be a way to recover these images, but we should probably
make sure that your configuration isn't unsafe to prevent this kind of
problem in the future.