[Gluster-users] Georeplication questions

wodel youchi wodel.youchi at gmail.com
Wed Mar 25 18:07:26 UTC 2020

Hi again,

I have more questions about geo-replication on oVirt-RHHI

Need to understand somethings about DR on oVirt-HI

1 - What does mean : Scheduling regular backups using geo-replication
(point 3.3.4 RHHI 1.7 Doc Maintaining RHHI)
     - Does this mean creating a check-point?
     - If yes, does this mean that the geo-replication process will sync
data up to that check-point and then stops the synchronization, then repeat
the same cycle the day after? does this mean that the minimum RPO is one

2 - Why the use of this check-point? why not let the geo-replication work
all the time?
3 - Geo-replication can be started/stoped after at any time, could this be
a problem when executing a disaster-recovery?
4 - I am running a test environnement, and it's not up all the time, but I
noticed this, if the geo-replication is running and the time of the
schedule (the check-point hour) is reached, the replication is stopped.
What does this mean?
5 - I created a snapshot of a VM on the source Manager, I synced the volume
then I executed a DR, The VM was started on the Target Manager but the VM
didn't have its snapshot, any idea???

Regards and be safe .

Le ven. 4 oct. 2019 à 06:32, Satheesaran Sundaramoorthi <sasundar at redhat.com>
a écrit :

> Hello Wodel,
> Glad to hear for considering gluster geo-replication for oVirt-gluster HC
> infra.
> More answers inline
> On Wed, Oct 2, 2019 at 3:54 PM wodel youchi <wodel.youchi at gmail.com>
> wrote:
>> Hi,
>> oVirt Hyperconverged disaster recovery uses georeplication to replicate
>> the volume containing the VMs.
>> What I know about georeplication is that it is an asynchronous
>> replication.
>> My questions are :
>> - How the replication of the VMs is done, are only the changes
>> synchronized?
> Gluster geo-replication should be configured from the gluster volume that
> backs the storage domain at your
> site to other( at the remote site ). Gluste geo-rep uses 'rsync' under the
> hoods, so post the first sync,
> only the changes are synchronized
>> - What is the interval of this replication? can this interval be
>> configured taking into consideration the bandwidth of the replication link.
> You have to make use of oVirt Manager to schedule your remote sync.
> Click on gluster volume backed storage domain -> click on 'Remote data
> sync setup' -> create a schedule
>> - How can the RPO be measured in the case of a georeplication?
> Its completely based on the schedule that you set.
> Geo-replication process by itself, sets the checkpoint at the master
> volume and it guarantees
> that contents will be synced till that checkpoint to the slave, when
> completed.
> Thanks,
> Satheesaran S ( sas )
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