[ovirt-users] [GlusterFS] Regarding gluster backup-volfile-servers option

[knarra]

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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