[Gluster-users] geo-replication master is distributed-replicated, slave is distributed only?

[Rahul Hinduja]

----- Original Message -----
> From: "M S Vishwanath Bhat" <msvbhat at gmail.com>
> To: "Christian Rice" <crice at pandora.com>
> Cc: gluster-users at gluster.org
> Sent: Monday, August 24, 2015 3:18:02 AM
> Subject: Re: [Gluster-users] geo-replication master is distributed-replicated, slave is distributed only?
> 
> 
> 
> On 24 August 2015 at 01:11, Christian Rice < crice at pandora.com > wrote:
> 
> 
> 
> Thanks so much for the response. I want to be sure I understand your caveat
> about slave volume being larger—that is not intuitive. I’d think the slave
> volume could be the same size, that is, same useable space as seen by a fuse
> client. Where does a larger slave volume size requirement come from, if I
> may ask?
> 
> Well, slave *can* be of sma esize as master (useable space). There is no need
> for slave to me *more* size than master.
> 
> But if you expand your master volume, make sure to expand slave volume as
> well.
> 
> //MS

Just to add, if the slave volume size is smaller than master volume size. Creating geo-replication will fail as command "create push-pem" performs the slave verification, which includes checking for a valid slave URL, valid slave volume, and available space on the slave. 

In such cases if the verification fails, you can use the *force* option which will ignore the failed verification and create a geo-replication session.

~Rahul


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> From: M S Vishwanath Bhat < msvbhat at gmail.com >
> Date: Saturday, August 22, 2015 at 10:59 AM
> To: Christian Rice < crice at pandora.com >
> Cc: " gluster-users at gluster.org " < gluster-users at gluster.org >
> Subject: Re: [Gluster-users] geo-replication master is
> distributed-replicated, slave is distributed only?
> 
> 
> 
> On 21 August 2015 at 23:46, Christian Rice < crice at pandora.com > wrote:
> 
> 
> 
> I’d like to have a distributed-replicated master volume, and distributed-only
> slave.
> 
> Can this be done? Just beginning the research, but so far I’ve only done
> geo-replication with distributed-only volumes. Tips/caveats on this kind
> architecture are welcome.
> 
> Yes, This can be done. Both master and slave can be of different
> configurations.
> 
> But make sure that your slave volume has more effective size available than
> the master volume.
> 
> HTH
> 
> //MS
> 
> 
> 
> 
> 
> The rationale is straightforward—the master volume should be able to stay
> available with all data when suffering a node loss, but the geo-replicated
> volumes can be taken offline for repairs and resync as soon as possible.
> 
> Cheers,
> Christian
> 
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