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[Qemu-devel] [Bug 1013714] Re: Data corruption after block migration (LV
From: |
Dennis Krul |
Subject: |
[Qemu-devel] [Bug 1013714] Re: Data corruption after block migration (LV->LV) |
Date: |
Wed, 27 Jun 2012 09:32:35 -0000 |
Hello Paolo,
We backported most of the block migration fixes from upstream to the
RHEL6 qemu-kvm package ourselves and are now unable to reproduce the
disk corruption problem anymore. So I guess the issues are (mostly)
fixed upstream.
You can close this bug, but I would still appreciate it if you could fix
this in the RHEL6 package (other RH customers might appreciate that as
well ;). We could even provide the patches if you like.
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https://bugs.launchpad.net/bugs/1013714
Title:
Data corruption after block migration (LV->LV)
Status in QEMU:
New
Bug description:
We quite frequently use the live block migration feature to move VM's
between nodes without downtime. These sometimes result in data
corruption on the receiving end. It only happens if the VM is actually
doing I/O (doesn't have to be all that much to trigger the issue).
We use logical volumes and each VM has two disks. We use cache=none
for all VM disks.
All guests use virtio (a mix of various Linux distro's and Windows
2008R2).
We currently have two stacks in use and have seen the issue on both of
them:
Fedora - qemu-kvm 0.13
Scientific Linux 6.2 (RHEL derived) - qemu-kvm package 0.12.1.2
Even though we don't run the most recent versions of KVM I highly
suspect this issue is still unreported and that filing a bug is
therefore appropriate. (There doesn't seem to be any similar bug
report in launchpad or RedHat's bugzilla and nothing related in change
logs, release notes and git commit logs.)
I have no idea where to look or where to start debugging this issue,
but if there is any way I can provide useful debug information please
let me know.
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