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<div class="moz-cite-prefix">Hi,<br>
<br>
backup-volfile-servers is mainly used to avoid SPOF. For
example take a scenario where you have Host A and Host B and when
you try to mount a glusterfs volume using Host A with
backup-volfile-servers specified, if Host A is not accessible,
mount will happen with Host B which is specified in
backup-volfile-server. backup-volfile-servers are mainly used to
fetch the volfile from gluster and has nothing to do with data
sync. <br>
<br>
data syncing comes as part of replicate feature in glusterfs
where say for example, you have two Hosts Host A and Host B with
replica volume configured, if Host A goes down for sometime, all
the writes happens on Host B and when Host A comes up data gets
synced to HostA. <br>
<br>
Hope this helps !!!!<br>
<br>
Thanks<br>
kasturi<br>
<br>
On 05/17/2017 11:31 PM, TranceWorldLogic . wrote:<br>
</div>
<blockquote
cite="mid:CAOtQfMQjx+FZmcno4AzWHMXY7eMRh54HXtRnOwLpVRyY+JxQcg@mail.gmail.com"
type="cite">
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<div>
<div>Hi,<br>
<br>
</div>
Before trying out, I want to understand how glusterfs will
react for below scenario.<br>
</div>
<div>Please help me.<br>
</div>
<div><br>
</div>
Let consider I have two host hostA and hostB<br>
</div>
I have setup replica volume on hostA and hostB. (consider as
storage domain for DATA in ovirt).<br>
</div>
I have configure data domain mount command with backup server
option (backup-volfile-server) as hostB (I mean main server as
hostA and backup as hostB)<br>
<div><br>
</div>
<div>1> As I understood, VDSM execute mount command on both
hostA and hostB.(for creating data domain)<br>
</div>
<div>2> That mean, HostB glusterFS CLIENT will communicate
with main server (hostA).<br>
</div>
<div>(Please correct me if I am wrong here.)<br>
</div>
<div>3> Let say HostA got down (say shutdown, power off
scenario)<br>
</div>
<div>4> Due to backup option I will have data domain
available on HostB.<br>
</div>
<div>(Now glusterFS CLIENT on HostB will start communicating
with HostB GlusterFS SERVER).<br>
</div>
<div>5> Now let say HostA comes up.<br>
</div>
<div>6> Will it sync all data from HostB to HostA glusterFS
server ?<br>
</div>
<div>(as per doc, yes, i not tried yet, want to confirm my
understanding)<br>
</div>
<div>7> Will glusterFS CLIENT on HostB start communicate with
main server (HostA) ?<br>
<br>
</div>
<div>Please let me know, I am new to glusterFS.<br>
<br>
</div>
<div>Thanks,<br>
</div>
<div>~Rohit<br>
</div>
</div>
<br>
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