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Hi,
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.
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.
Hope this helps !!!!
Thanks
kasturi
On 05/17/2017 11:31 PM, TranceWorldLogic . wrote:
Hi,
Before trying out, I want to understand how glusterfs will react for
below scenario.
Please help me.
Let consider I have two host hostA and hostB
I have setup replica volume on hostA and hostB. (consider as storage
domain for DATA in ovirt).
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)
1> As I understood, VDSM execute mount command on both hostA and
hostB.(for creating data domain)
2> That mean, HostB glusterFS CLIENT will communicate with main server
(hostA).
(Please correct me if I am wrong here.)
3> Let say HostA got down (say shutdown, power off scenario)
4> Due to backup option I will have data domain available on HostB.
(Now glusterFS CLIENT on HostB will start communicating with HostB
GlusterFS SERVER).
5> Now let say HostA comes up.
6> Will it sync all data from HostB to HostA glusterFS server ?
(as per doc, yes, i not tried yet, want to confirm my understanding)
7> Will glusterFS CLIENT on HostB start communicate with main server
(HostA) ?
Please let me know, I am new to glusterFS.
Thanks,
~Rohit
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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">
<div dir="ltr">
<div>
<div>
<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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