Can’t resize VM harddisk, “got timeout (500)”.

Guillaume Soucy

Well-Known Member
Oct 20, 2017
L'Orignal, Canada

I need to increase the size of one of my VM hard disk but I got an error saying: got timeout (500).

I got two error messages The first one is when the VM running and the second is when the VM was stopped.

VM 110 qmp command 'block_resize' failed - got timeout (500)


command '/usr/bin/qemu-img resize -f qcow2 /mnt/disks/images/110/vm-110-disk-1.qcow2 7516192768000' failed: got timeout (500)

How to get rid of theses error messages?


Looks like the resize is taking too long. If I see that right you want to resize it to 7.5TB?
Could you try 'qm resize <vmid> <disk> <size>'? (see 'man qm' for more information on that command)
The desired size was 5TB, I don't know if this was causing the issue but when I uncheck the "has a backup" check box in the hard drive advances settings, the size of the drive jump to 9TB. Its mathematically logic as I tries three attempts, probably they get stuck as there nothing who appeared in red in the log pan, usually when something happen I can read it in red there.

I will tick back the case for "has a backup" and reattempt to do the same operation to see.

Not at all, whatever if the "no backup" case is checked or not I can now expand hard drives.

Other thing is I see an very high IO usage who occur each first Sunday of each month. This also affect the services running on the VMs. I can see an average of 10% with peeks up to 40%.

Today Monday Jan 7th, the physical host run very fast. This happened also at Oct 7th, Nov 4th, Dec 2nd and yesterday Jan 6th 2019. Its seem to have a kind of pattern there.

When the issue occurred the server also run a process named md4_resync and this process has a CPU load of 41.0% and it was ran by root.



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