lzer"
> À: "Alex Crow"
> Cc: ceph-users@lists.ceph.com
> Envoyé: Samedi 12 Avril 2014 17:56:07
> Objet: Re: [ceph-users] qemu + rbd block driver with cache=writeback, is live
> migration safe ?
>
>
> Hello,
>
>> On Sat, 12 Apr 2014 16:26:40 +0
is working, I'm
interested)
- Mail original -
De: "Alex Crow"
À: ceph-users@lists.ceph.com
Envoyé: Samedi 12 Avril 2014 17:26:40
Objet: Re: [ceph-users] qemu + rbd block driver with cache=writeback, is live
migration safe ?
Hi.
I've read in many places that you sh
hanks for link reference !
- Mail original -
De: "Christian Balzer"
À: "Alex Crow"
Cc: ceph-users@lists.ceph.com
Envoyé: Samedi 12 Avril 2014 17:56:07
Objet: Re: [ceph-users] qemu + rbd block driver with cache=writeback, is live
migration safe ?
Hello,
Hello,
AFAIK qemu calls bdrv_flush at the end of migration process so this is
absolutely safe. Anyway it`s proven by our production systems very
well too :)
On Sat, Apr 12, 2014 at 7:01 PM, Alexandre DERUMIER wrote:
> Hello,
>
> I known that qemu live migration with disk with cache=writeback are
Hello,
On Sat, 12 Apr 2014 16:26:40 +0100 Alex Crow wrote:
> Hi.
>
> I've read in many places that you should never use writeback on any kind
> of shared storage. Caching is better dealt with on the storage side
> anyway as you have hopefully provided resilience there. In fact if your
> SAN/
Hi.
I've read in many places that you should never use writeback on any kind
of shared storage. Caching is better dealt with on the storage side
anyway as you have hopefully provided resilience there. In fact if your
SAN/NAS is good enough it's supposed to be best to use "none" as the
caching
Hello,
I known that qemu live migration with disk with cache=writeback are not safe
with storage like nfs,iscsi...
Is it also true with rbd ?
If yes, it is possible to disable manually writeback online with qmp ?
Best Regards,
Alexandre
___
ceph-us
