[ kvm-Bugs-2490866 ] repeatable corruption with qcow2 on kvm-79

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Bugs item #2490866, was opened at 2009-01-06 21:10
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Category: qemu
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Adrian Bridgett (abridgett)
Assigned to: Nobody/Anonymous (nobody)
Summary: repeatable corruption with qcow2 on kvm-79

Initial Comment:
Creating a qcow2 image, mkfs.ext3, sometimes mounting it would fail immediately, but in all cases it would corrupt (overwritten with zeros) after starting up backuppc on it.   This is KVM-79 on a Debian lenny host and guest.

This occured using virtio or not.  Swapping to a raw file or LV worked flawlessly.  I've tested the box with memtest and I don't have issues elsewhere but I've seen corruptions on other images.  host and guest are both 2.6.26-1-adm64 kernel (debian lenny) I'm running 32-bit userspace everywhere.  Dual core Intel Core2 E6300.

I see KVM-81 has "improve qcow2 data integrity with cache=writethrough" which _might_ be what I'm hitting - but I can't find more details about this to check (and backport patch to debian package or wait for newer debian package).

thanks.

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