Open Stack

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
> 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
> Tel : +33 9 72 37 94 15
>
>
> Le 24 juil. 2013 à 16:25, Jacob Godin <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>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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