<div dir="ltr">1) RAID5 may be a performance hit<div><br></div><div>2) I'd be inclined to do this as JBOD by creating a distributed disperse volume on each server. Something like<div><br></div><div>echo gluster volume create dispersevol disperse-data 5 redundancy 2 \</div><div>$(for SERVER in a b c; do for BRICK in $(seq 1 5); do echo -e "server${SERVER}:/brick/brick-${SERVER}${BRICK}/brick \c"; done; done)</div><div><br></div><div>3) I think the above</div><div><br></div><div>4) Gluster does support tiering, but IIRC you'd need the same number of SSD as spindle drives. There may be another way to use the SSD as a fast cache. </div><div><br></div><div>Where are you putting the OS?</div><div><br></div><div>Hope I understood the question...</div><div><br></div><div>Thanks</div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Aug 6, 2017 at 10:49 PM, Moacir Ferreira <span dir="ltr"><<a href="mailto:moacirferreira@hotmail.com" target="_blank">moacirferreira@hotmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p><span>I am willing to assemble a oVirt "pod", made of 3 servers, each with 2 CPU sockets of 12 cores, 256GB RAM, 7 HDD 10K, 1 SSD. The idea is to use GlusterFS to provide HA for the VMs. The 3 servers have a dual 40Gb NIC and a dual 10Gb NIC. So my intention
is to create a loop like a server triangle using the 40Gb NICs for virtualization files (VMs .qcow2) access and to move VMs around the pod (east /west traffic) while using the 10Gb interfaces for giving services to the outside world (north/south traffic).</span></p>
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<p>This said, my first question is: How should I deploy GlusterFS in such oVirt scenario? My questions are:</p>
<p><br>
</p>
<p>1 - Should I create 3 RAID (i.e.: RAID 5), one on each oVirt node, and then create a GlusterFS using them?</p>
<p>2 - Instead, should I create a JBOD array made of all server's disks?</p>
<p>3 - What is the best Gluster configuration to provide for HA while not consuming too much disk space?<br>
</p>
<p>4 - Does a oVirt hypervisor pod like I am planning to build, and the virtualization environment, benefits from tiering when using a SSD disk? And yes, will Gluster do it by default or I have to configure it to do so?</p>
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</p>
<p>At the bottom line, what is the good practice for using GlusterFS in small pods for enterprises?<br>
</p>
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</p>
<p>You opinion/feedback will be really appreciated!</p><span class="HOEnZb"><font color="#888888">
<p>Moacir<br>
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