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Bug 1048915 - QCOW2 disk corruption after a "thin provition" guest paused
Summary: QCOW2 disk corruption after a "thin provition" guest paused
Alias: None
Product: Red Hat Enterprise Virtualization Manager
Classification: Red Hat
Component: vdsm
Version: 3.2.0
Hardware: All
OS: Linux
Target Milestone: ---
: 3.5.0
Assignee: Nir Soffer
QA Contact: Aharon Canan
Whiteboard: storage
Depends On:
TreeView+ depends on / blocked
Reported: 2014-01-06 13:19 UTC by Juan Sebastian Castro
Modified: 2017-11-14 17:00 UTC (History)
11 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2014-02-23 08:16:33 UTC
oVirt Team: Storage
Target Upstream Version:
tnisan: Triaged+

Attachments (Terms of Use)

Description Juan Sebastian Castro 2014-01-06 13:19:24 UTC
Description of problem: Guest vm with thin privision allocation policy got paused. Because of that there was no possibility to recover the QCOW2 disk and the data is now corrupt.

Version-Release number of selected component (if applicable):

VDSM: vdsm-4.10.2-27.0.el6ev
RHEV Hypervisor: 6.4 - 20131016.0.el6

How reproducible: Undetermined

Steps to Reproduce:
1. Create a guest vm with thin provisioning disk
2. Wait for VM to flip its state to pause with the message: "VM has been paused fue to a storage IO error"

Actual results: The VM got paused

Expected results: The VM shouldn't be paused.

Additional info: Modifications to the vdsm.conf file were applied to workaround the issue without possitive results (KCS: https://access.redhat.com/site/solutions/385283)

Comment 1 Ayal Baron 2014-01-06 13:25:35 UTC
VMs automatically move to paused if they receive EIO in RHEV, this has nothing to do with thin provisioning.
Resuming the VM would make it retry the same I/O.  If the original storage problem (that caused the EIO) persists then it will pause again.

1. What make you determine that there is a qcow2 corruption here?
2. please attach vdsm and libvirt logs.


Comment 9 Allon Mureinik 2014-01-27 13:25:21 UTC
Nir, please take a look.

Comment 10 Nir Soffer 2014-01-28 20:14:24 UTC
Please attach engine, vdsm, libvirt and qemu logs.

engine: /path/to/ovirt-engine/var/log/engine.log
vdsm: /var/log/vdsm/vdsm.log
libvirt: /var/log/libvirtd.log
qemu: /var/log/libvirt/qemu/vmname.log

Comment 11 Nir Soffer 2014-01-28 20:54:22 UTC
Please attach also the output of "qemu-img info /path/to/disk" for all disks on this vm.

Comment 12 Kevin Wolf 2014-01-29 09:04:54 UTC
What is the oldest qemu-kvm version that was used with this specific image?
Trying to make sure that it's not a duplicate of bug 974617 (copied as bug 996151
for 6.4.z), which was fixed in qemu-kvm-

Comment 14 Brian Hamrick 2014-02-17 14:38:18 UTC
This is for Juan to answer.  I am not technically driving this bug.

Comment 15 Ayal Baron 2014-02-23 08:16:33 UTC
We cannot make progress without further info.  Please reopen once it is available.

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