<div dir="ltr">Hi Stephane,<div><br></div><div>This is actually done in Nova with the config directive disk_cachemodes="file=writeback"</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, Jul 24, 2013 at 11:47 AM, Stephane Boisvert <span dir="ltr"><<a href="mailto:stephane.boisvert@gameloft.com" target="_blank">stephane.boisvert@gameloft.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<div>sorry to interfere in that thread but I
did set cache=true in my ceph config... but where I can set
cache=writeback ? <br>
<br>
<br>
thanks for your help <br><div><div class="h5">
<br>
On 13-07-24 10:40 AM, Jacob Godin wrote:<br>
</div></div></div><div><div class="h5">
<blockquote type="cite">
<div dir="ltr">A few things I found were key for I/O performance:
<div>
<ol>
<li>Make sure your network can sustain the traffic. We are
using a 10G backbone with 2 bonded interfaces per node.</li>
<li>Use high speed drives. SATA will not cut it.</li>
<li>Look into tuning settings. Razique, thanks for sending
these along to me a little while back. A couple that I
found were useful:</li>
<ul>
<li>KVM cache=writeback (a little risky, but WAY faster)</li>
<li>Gluster write-behind-window-size (set to 4MB in our
setup)</li>
<li>Gluster cache-size (ideal values in our setup were
96MB-128MB)</li>
</ul>
</ol>
<div>Hope that helps!</div>
</div>
<div><br>
</div>
</div>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">On Wed, Jul 24, 2013 at 11:32 AM,
Razique Mahroua <span dir="ltr"><<a href="mailto:razique.mahroua@gmail.com" target="_blank">razique.mahroua@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="word-wrap:break-word">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
<div>
<br>
</div>
<div>Regards,</div>
<div>Razique</div>
<div><br>
<div>
<span><span style="font-weight:normal;font-family:Helvetica"><b style="color:rgb(19,112,138)">Razique Mahroua</b></span><span style="font-weight:normal;font-family:Helvetica;color:rgb(19,112,138)"><b> - </b></span><span style="font-family:Helvetica"><span style="font-weight:normal;font-family:Helvetica"><b style="color:rgb(19,112,138)">Nuage & Co</b></span><span style="border-collapse:separate;font-family:Helvetica;font-style:normal;font-variant:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;border-spacing:0px;font-size:medium"><span style="border-spacing:0px;text-indent:0px;letter-spacing:normal;font-variant:normal;text-align:-webkit-auto;font-style:normal;font-weight:normal;line-height:normal;border-collapse:separate;text-transform:none;font-size:medium;white-space:normal;font-family:Helvetica;word-spacing:0px"><span style="border-collapse:separate;font-variant:normal;letter-spacing:normal;line-height:normal;text-align:-webkit-auto;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;border-spacing:0px">
<div style="font-style:normal;font-size:medium;font-family:Helvetica;font-weight:normal"><font color="#13708a"><a href="mailto:razique.mahroua@gmail.com" target="_blank">razique.mahroua@gmail.com</a></font></div>
<div style="font-style:normal;font-size:medium;font-family:Helvetica"><font color="#13708a">Tel : +33 9 72 37 94 15</font></div>
</span></span></span></span></span><br style="text-indent:0px;letter-spacing:normal;font-variant:normal;text-align:-webkit-auto;font-style:normal;font-weight:normal;line-height:normal;text-transform:none;font-size:medium;white-space:normal;font-family:Arial;word-spacing:0px">
<span><img src="cid:part3.09090204.04050206@gameloft.com" height="125" width="125"></span>
</div>
<br>
<div>
<div>Le 24 juil. 2013 à 16:25, Jacob Godin <<a href="mailto:jacobgodin@gmail.com" target="_blank">jacobgodin@gmail.com</a>>
a écrit :</div>
<div>
<div><br>
<blockquote type="cite">
<div dir="ltr">Hi Denis,
<div>
<br>
</div>
<div>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.</div>
<div><br>
</div>
</div>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">On Wed, Jul 24, 2013
at 11:11 AM, Denis Loshakov <span dir="ltr"><<a href="mailto:dloshakov@gmail.com" target="_blank">dloshakov@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi all,<br>
<br>
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).<br>
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.<br>
<br>
One solution is to install Linux on both
servers and use DRBD + OCFS2, any comments
on this?<br>
Also I heard about Quadstor software and
it can create network RAID and present it
via iSCSI.<br>
<br>
Thanks.<br>
<br>
P.S. Glance uses swift and is setuped on
another servers<br>
<br>
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<br>
</div></div><span class="HOEnZb"><font color="#888888"><div>-- <br>
<table border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td rowspan="8"><img src="cid:part10.05060908.03080703@gameloft.com"></td>
</tr>
<tr>
<td><b>Stéphane Boisvert</b></td>
</tr>
<tr>
<td>GNS-Shop Technical Coordinator</td>
</tr>
<tr>
<td><font size="2px">5800 St-Denis suite 1001</font></td>
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<td><font size="2px">Montreal (QC), H2S 3L5</font></td>
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<td><b><font size="2px">MSN:</font></b><font size="2px">
<a href="mailto:stephane.boisvert@gameloft.com" target="_blank">stephane.boisvert@gameloft.com</a></font></td>
</tr>
<tr>
<td><b><font size="2px">E-mail:</font></b><font size="2px">
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