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<div class="moz-cite-prefix">On 05/12/2016 05:35 AM, Bill Bill
wrote:<br>
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<p class="MsoNormal">Hello,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Let’s say I have a 5 node converged cluster
of oVirt & glusterFS with a replica count of “3”.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Host1 - replica</p>
<p class="MsoNormal">Host2 - replica</p>
<p class="MsoNormal">Host3 - replica</p>
<p class="MsoNormal">Host4</p>
<p class="MsoNormal">Host5</p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif"> </span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif">If I spin a VM up on Host1 – does the
first replica get created local to that server?</span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif"> </span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif">In the event I move the VM to another
host, does the replica of the disk follow the VM so
essentially it’s writing to a local copy first or does it
“always” write across the network.</span></p>
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<br>
Any writes are written to all 3 hosts that form the replica 3
gluster volume. Replica 3 - indicates that there is a 3-way copy of
data, and the same data resides on Host1, Host2 and Host3. <br>
<br>
Reads however are from local host. So for a VM running on Host1, it
will access the data (i.e. read) from the brick on Host1.<br>
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<p class="MsoNormal"><span
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<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif">For example, with VMware, the disk will
follow the VM to the hypervisor you move it to so that the
writes are essentially “local”.
</span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif"> </span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif">I have not been able to find anything on
the internet or in the documentation that specifies how this
process works. Ideally, you wouldn’t want a VM residing on
Host1 that accesses its disk on Host3. Multiple that by
hundreds of VM’s and it would create a ton of unnecessary
network congestion.</span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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