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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Century Gothic&quot;,&quot;sans-serif&quot;;color:blue">We only have about 200 VMs, but we’ve run into this bug [1] because we use a high number of direct attach luns on our VMs.&nbsp; It takes about 5 minutes to
 scan all the fibre channel luns (same issues exists with iSCSI) and used times out before completing (until we changed the value of vdsTimeout higher).<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Century Gothic&quot;,&quot;sans-serif&quot;;color:blue">Also because of the way our FC storage is presented, we have about 1,400 multipath devices presented to each host.&nbsp; This contributes to really long scan
 times and I think causes some general slowness in administration side and “Bad Request” 500 Errors when running some storage commands from the API.&nbsp; VMs themselves still run just fine with no noticeable performance issues though.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Century Gothic&quot;,&quot;sans-serif&quot;;color:blue">[1]
<a href="https://bugzilla.redhat.com/show_bug.cgi?id=1217401">https://bugzilla.redhat.com/show_bug.cgi?id=1217401</a><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> Patrick Russell [mailto:patrick_russell@volusion.com]
<br>
<b>Sent:</b> Tuesday, August 18, 2015 3:07 PM<br>
<b>To:</b> Matthew Lagoe<br>
<b>Cc:</b> Groten, Ryan; users@ovirt.org<br>
<b>Subject:</b> Re: [ovirt-users] Benefits of Cluster separation<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<p class="MsoNormal">Can I ask at what scale you’re running into issues? We’ve got about 500 VM’s running now in a single cluster.&nbsp;
<o:p></o:p></p>
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<p class="MsoNormal">-Patrick<o:p></o:p></p>
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<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
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<p class="MsoNormal">On Aug 18, 2015, at 4:03 PM, Matthew Lagoe &lt;<a href="mailto:matthew.lagoe@subrigo.net">matthew.lagoe@subrigo.net</a>&gt; wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">You can have different cluster policy’s at least, don’t know what other benefits there are however as I haven’t noticed any.</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:#1F497D">&nbsp;</span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span class="apple-converted-space"><span style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">&nbsp;</span></span><span style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"><a href="mailto:users-bounces@ovirt.org"><span style="color:purple">users-bounces@ovirt.org</span></a><span class="apple-converted-space">&nbsp;</span>[<a href="mailto:users-bounces@ovirt.org"><span style="color:purple">mailto:users-bounces@ovirt.org</span></a>]<span class="apple-converted-space">&nbsp;</span><b>On
 Behalf Of<span class="apple-converted-space">&nbsp;</span></b>Groten, Ryan<br>
<b>Sent:</b><span class="apple-converted-space">&nbsp;</span>Tuesday, August 18, 2015 01:59 PM<br>
<b>To:</b><span class="apple-converted-space">&nbsp;</span><a href="mailto:users@ovirt.org"><span style="color:purple">users@ovirt.org</span></a><br>
<b>Subject:</b><span class="apple-converted-space">&nbsp;</span>[ovirt-users] Benefits of Cluster separation</span><o:p></o:p></p>
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<p class="MsoNormal">&nbsp;<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Century Gothic&quot;,&quot;sans-serif&quot;">We’re running into some performance problems stemming from having too many Hosts/VMs/Disks running from the same Datacenter/Cluster.&nbsp; Because of that I’m looking into
 splitting the DC into multiple separate ones with different Hosts/Storage.</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Century Gothic&quot;,&quot;sans-serif&quot;">But I’m a little confused what the benefit of separating hosts into clusters achieves.&nbsp; Can someone please explain what the common use cases are?&nbsp; Since all the clusters
 in a DC seem to need to see the same storage, I don’t think it would help my situation anyway.</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Century Gothic&quot;,&quot;sans-serif&quot;">&nbsp;</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Century Gothic&quot;,&quot;sans-serif&quot;">Thanks,</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:&quot;Century Gothic&quot;,&quot;sans-serif&quot;">Ryan<span class="apple-converted-space">&nbsp;</span></span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:&quot;Helvetica&quot;,&quot;sans-serif&quot;">_______________________________________________<br>
Users mailing list<br>
</span><a href="mailto:Users@ovirt.org"><span style="font-size:9.0pt;font-family:&quot;Helvetica&quot;,&quot;sans-serif&quot;;color:purple">Users@ovirt.org</span></a><span style="font-size:9.0pt;font-family:&quot;Helvetica&quot;,&quot;sans-serif&quot;"><br>
</span><a href="http://lists.ovirt.org/mailman/listinfo/users"><span style="font-size:9.0pt;font-family:&quot;Helvetica&quot;,&quot;sans-serif&quot;;color:purple">http://lists.ovirt.org/mailman/listinfo/users</span></a><o:p></o:p></p>
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