I’m running kvm virtualization with rbd storage, some images on rbd pool become
efficiently unusable after VM restart.
All I/O to problematic rbd image blocks infinitely.
Checked that it is not a permission or locking problem.
The bug was silent until we performed a planned restart of few VMs and some of VMs failed
to start (kvm process timed out).
It could be related to recent upgrades luminous to nautilus or proxmox 5 to 6.
Ceph backend is clean, no observable problems, all mons/mgrs/osds up and running. Network
Nothing in logs relevant to the problem.
ceph version 14.2.6 (ba51347bdbe28c7c0e2e9172fa2983111137bb60) nautilus (stable)
kernel 5.3.13-2-pve #1 SMP PVE 5.3.13-2 (Fri, 24 Jan 2020 09:49:36 +0100) x86_64
# rbd status rbd-technet/vm-402-disk-0
# rbd status rbd-technet/vm-402-disk-1
Normal image vs problematic:
# rbd object-map check rbd-technet/vm-402-disk-0
Object Map Check: 100% complete…done.
# rbd object-map check rbd-technet/vm-402-disk-1
disk-0 is good while disk-1 is effectively lost. Command hangs for many minutes with no
visible activity, interrupted.
rbd export runs without problems, however some data is lost after being imported back
rbd deep copy worked for me. Copy looks good, no errors.
# rbd info rbd-technet/vm-402-disk-1
rbd image 'vm-402-disk-1':
size 16 GiB in 4096 objects
order 22 (4 MiB objects)
features: layering, exclusive-lock, object-map, fast-diff, deep-flatten, journaling
create_timestamp: Fri Jan 31 17:50:50 2020
access_timestamp: Sat Mar 7 00:30:53 2020
modify_timestamp: Sat Mar 7 00:33:35 2020
mirroring state: disabled
What can be done to debug this problem?
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Any news on this error? I'm facing the same issue I guess. Had a Windows Server copy
data to some RBD images through iSCSI and the server got stuck and had to be reset and now
the images that had data are blocking all I/O operations, including editing their config,
creating snapshots, etc.
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