Open Stack

sorry to interfere in that thread but I did set  cache=true in my ceph 
config... but where I can set cache=writeback ?


thanks for your help

On 13-07-24 10:40 AM, Jacob Godin wrote:
> A few things I found were key for I/O performance:
>
>  1. Make sure your network can sustain the traffic. We are using a 10G
>     backbone with 2 bonded interfaces per node.
>  2. Use high speed drives. SATA will not cut it.
>  3. Look into tuning settings. Razique, thanks for sending these along
>     to me a little while back. A couple that I found were useful:
>       * KVM cache=writeback (a little risky, but WAY faster)
>       * Gluster write-behind-window-size (set to 4MB in our setup)
>       * Gluster cache-size (ideal values in our setup were 96MB-128MB)
>
> Hope that helps!
>
>
>
> On Wed, Jul 24, 2013 at 11:32 AM, Razique Mahroua 
> <razique.mahroua at gmail.com <mailto:razique.mahroua at gmail.com>> wrote:
>
>     I had much performance issues myself with Windows instances, and
>     I/O demanding instances. Make sure it fits your env. first before
>     deploying it in production
>
>     Regards,
>     Razique
>
>     *Razique Mahroua** - **Nuage & Co*
>     razique.mahroua at gmail.com <mailto:razique.mahroua at gmail.com>
>     Tel : +33 9 72 37 94 15
>
>
>     Le 24 juil. 2013 à 16:25, Jacob Godin <jacobgodin at gmail.com
>     <mailto:jacobgodin at gmail.com>> a écrit :
>
>>     Hi Denis,
>>
>>     I would take a look into GlusterFS with a distributed, replicated
>>     volume. We have been using it for several months now, and it has
>>     been stable. Nova will need to have the volume mounted to its
>>     instances directory (default /var/lib/nova/instances), and Cinder
>>     has direct support for Gluster as of Grizzly I believe.
>>
>>
>>
>>     On Wed, Jul 24, 2013 at 11:11 AM, Denis Loshakov
>>     <dloshakov at gmail.com <mailto:dloshakov at gmail.com>> wrote:
>>
>>         Hi all,
>>
>>         I have issue with creating shared storage for Openstack. Main
>>         idea is to create 100% redundant shared storage from two
>>         servers (kind of network RAID from two servers).
>>         I have two identical servers with many disks inside. What
>>         solution can any one provide for such schema? I need shared
>>         storage for running VMs (so live migration can work) and also
>>         for cinder-volumes.
>>
>>         One solution is to install Linux on both servers and use DRBD
>>         + OCFS2, any comments on this?
>>         Also I heard about Quadstor software and it can create
>>         network RAID and present it via iSCSI.
>>
>>         Thanks.
>>
>>         P.S. Glance uses swift and is setuped on another servers
>>
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>>
>>
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>
>
>
>
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