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. After
> > Just the lack of fdatasyncs.
>
> I also did not see any fdatasyncs when using cache=none - would that also be
> explained by this bug?
Yes, cache=none and cache=writeback are the same as far as the _disk_ cache
is concerned, and you need fdatasyncs to flush the disk cache too.
Paolo
- Original Message -
> From: "Paolo Bonzini"
> To: "Andrew Martin"
> Cc: "Stefan Hajnoczi" , "qemu-devel"
>
> Sent: Wednesday, August 27, 2014 9:34:27 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 fo
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
- Original Message -
> From: "Paolo Bonzini"
> To: "Andrew Martin" , "Stefan Hajnoczi"
>
> Cc: "qemu-devel"
> Sent: Tuesday, August 26, 2014 2:03:18 AM
> Subject: Re: Using cache=writeback safely on qemu 1.4.0 and later
>
> > In the case of the files uploaded by apache2, they were adde
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:
> https://www.suse.com/documentat
- Original Message -
> From: "Stefan Hajnoczi"
> To: "Andrew Martin"
> Cc: "qemu-devel"
> 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 di
On Wed, Aug 20, 2014 at 12:20 AM, Andrew Martin wrote:
> - Original Message -
>> From: "Stefan Hajnoczi"
>> To: "Andrew Martin"
>> Cc: qemu-devel@nongnu.org
>> Sent: Tuesday, August 19, 2014 9:59:25 AM
>> Subject: Re: [Qemu-devel] Usi
- Original Message -
> From: "Stefan Hajnoczi"
> To: "Andrew Martin"
> 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 t
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 th
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 o
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