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3:54 p.m.
On Thursday, May 12, 2016 12:05:22 AM Bill Bill wrote:
Hello,
Let’s say I have a 5 node converged cluster of oVirt & glusterFS with a
replica count of “3”.
Host1 - replica
Host2 - replica
Host3 - replica
Host4
Host5
If I spin a VM up on Host1 – does the first replica get created local to
that server?
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.
For example, with VMware, the disk will follow the VM to the
hypervisor you
move it to so that the writes are essentially “local”.
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.
While I cannot answer your actual question as I don't know enough about the
internal implementation of how oVirt interacts with gluster. I just want to
point out major difference between oVirt and VMWare. In oVirt storage domains
are attached to data centers, not hosts. So there is no does the disk move
from host1 to host2. The disk is on the storage domain and host1 and host2 and
every other host in the data center has access to the storage domain.
10:05 a.m.
This is a multi-part message in MIME format.
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On 05/12/2016 05:35 AM, Bill Bill wrote:
Hello,
Lets say I have a 5 node converged cluster of oVirt & glusterFS with
a replica count of 3.
Host1 - replica
Host2 - replica
Host3 - replica
Host4
Host5
If I spin a VM up on Host1 does the first replica get created local
to that server?
In the event I move the VM to another host, does the replica of the
disk follow the VM so essentially its writing to a local copy first
or does it always write across the network.
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.
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.
For example, with VMware, the disk will follow the VM to the
hypervisor you move it to so that the writes are essentially local.
I have not been able to find anything on the internet or in the
documentation that specifies how this process works. Ideally, you
wouldnt want a VM residing on Host1 that accesses its disk on Host3.
Multiple that by hundreds of VMs and it would create a ton of
unnecessary network congestion.
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
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<div class="moz-cite-prefix">On 05/12/2016 05:35 AM, Bill Bill
wrote:<br>
</div>
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<p class="MsoNormal">Hello,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Lets 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 its writing to a local copy first or does it
always write across the network.</span></p>
</div>
</blockquote>
<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>
<br>
<blockquote
cite="mid:SN1PR08MB1389E9AA24246B61EE308341A6730@SN1PR08MB1389.namprd08.prod.outlook.com"
type="cite">
<div class="WordSection1">
<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">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 wouldnt want a VM residing on
Host1 that accesses its disk on Host3. Multiple that by
hundreds of VMs and it would create a ton of unnecessary
network congestion.</span></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
Users mailing list
<a class="moz-txt-link-abbreviated"
href="mailto:Users@ovirt.org">Users@ovirt.org</a>
<a class="moz-txt-link-freetext"
href="http://lists.ovirt.org/mailman/listinfo/users">http://...
</pre>
</blockquote>
<br>
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--------------050708010909020807020403--
3111
days inactive
3116
days old
2 comments
3 participants
participants (3)
-
Alexander Wels -
Bill Bill -
Sahina Bose