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Hi Stephane,

If you have any existing instances, you will need to completely power them
off and back on again for the change to take affect.


On Wed, Jul 24, 2013 at 12:30 PM, Stephane Boisvert <
stephane.boisvert at gameloft.com> wrote:

>  Thanks for the quick answer.. I already did it but it seems not to be
> taken in account... I'll test it again and open a new thread if I fail.
>
> Thanks Jacob
>
>
>
> On 13-07-24 11:20 AM, Jacob Godin wrote:
>
> Hi Stephane,
>
>  This is actually done in Nova with the config
> directive disk_cachemodes="file=writeback"
>
>
> On Wed, Jul 24, 2013 at 11:47 AM, Stephane Boisvert <
> stephane.boisvert at gameloft.com> wrote:
>
>>  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> 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
>>>>
>>>> _______________________________________________
>>>> OpenStack-operators mailing list
>>>> OpenStack-operators at lists.openstack.org
>>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators
>>>>
>>>
>>>  _______________________________________________
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>>>
>>>
>>>
>>
>>
>> _______________________________________________
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>>
>>
>>
>>   --
>>    *Stéphane Boisvert*  GNS-Shop Technical Coordinator  5800 St-Denis
>> suite 1001  Montreal (QC), H2S 3L5  *MSN:* stephane.boisvert at gameloft.com
>> *E-mail:* stephane.boisvert at gameloft.com
>>
>> _______________________________________________
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>> OpenStack-operators at lists.openstack.org
>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators
>>
>>
>
>
> --
>    *Stéphane Boisvert*  GNS-Shop Technical Coordinator  5800 St-Denis
> suite 1001  Montreal (QC), H2S 3L5  *MSN:* stephane.boisvert at gameloft.com
> *E-mail:* stephane.boisvert at gameloft.com
>
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