On Mon, Aug 25, 2014 at 01:13:09PM -0500, Andrew Martin wrote:
I recently experienced UPS failure on several hosts which caused a hard
shutdown. After restarting, 3 of the guests had corruption on their
disks
and
required a fairly long fsck to fix. Afterwards, data that had
- Original Message -
From: Paolo Bonzini pbonz...@redhat.com
To: Andrew Martin amar...@xes-inc.com, Stefan Hajnoczi
stefa...@gmail.com
Cc: qemu-devel qemu-devel@nongnu.org
Sent: Tuesday, August 26, 2014 2:03:18 AM
Subject: Re: Using cache=writeback safely on qemu 1.4.0 and later
Il 27/08/2014 16:23, Andrew Martin ha scritto:
Thanks for the info about this bug - I am using QEMU 1.4.0 (released on
02/15/13)
and ef5bc96268 was added on 09/20/13, so the bug had not been fixed in the
version
of QEMU I am using. I have had trouble reproducing it on-demand - was there
Il 25/08/2014 20:13, Andrew Martin ha scritto:
Even if the python daemon or apache2 did not fsync the modified files, isn't
there some action that the OS takes periodically to flush dirty pages to
disk?
This seems to be implied in the SuSE documentation:
- Original Message -
From: Stefan Hajnoczi stefa...@gmail.com
To: Andrew Martin amar...@xes-inc.com
Cc: qemu-devel qemu-devel@nongnu.org
Sent: Thursday, August 21, 2014 7:59:50 AM
Subject: Re: [Qemu-devel] Using cache=writeback safely on qemu 1.4.0 and later
When the disk is set
=writeback safely on qemu 1.4.0 and
later
If you strace -f the QEMU process on the host, you will see fdatasync(2)
system calls when the guest flushes the disk.
You can find the file descriptor number by checking ls -l
/proc/$PID_OF_QEMU/fd and looking for the disk image file.
When the disk
On Fri, Aug 15, 2014 at 03:18:15PM -0500, Andrew Martin wrote:
Hello,
I am running several qemu-kvm VM servers on Ubuntu 12.04 with qemu-kvm 1.4.0.
Most of the guests are also running Ubuntu 12.04. I am using qcow2 disk images
with the virtio driver in almost all cases, and am storing the
- Original Message -
From: Stefan Hajnoczi stefa...@gmail.com
To: Andrew Martin amar...@xes-inc.com
Cc: qemu-devel@nongnu.org
Sent: Tuesday, August 19, 2014 9:59:25 AM
Subject: Re: [Qemu-devel] Using cache=writeback safely on qemu 1.4.0 and later
If you strace -f the QEMU process
Hello,
I am running several qemu-kvm VM servers on Ubuntu 12.04 with qemu-kvm 1.4.0.
Most of the guests are also running Ubuntu 12.04. I am using qcow2 disk images
with the virtio driver in almost all cases, and am storing the disks on two
types of storage devices:
* a shared NFS server mounted
