[Gluster-users] Replicate Over VPN

[Alex Chekholko]

Replying back to list.

I don't know of a currently available clustered filesystem that allows 
bi-directional asynchronous replication.  Even in your case where you 
can have manual curation, what would you want to happen when two humans 
modify the same files at the same time in your two geographic locations? 
  And don't tell us it will never happen.

Synchronous replication works a bit differently everywhere, so you'll 
just want to double-check which is most compatible with your workflow.

In glusterfs, the client talks to all replicas and returns when each 
replica has confirmed it has written the data.

In ceph, the client talks to the master replica, and then that master 
replica forwards the writes to all the other replicas, and then confirms 
to the client that all the replicas are written.


For your async use case, how often does the shared data change?  Perhaps 
something like a plain rsync every night would be sufficient?  Or a ZFS 
send/receive if that's faster than rsync?


On 03/17/2014 02:58 PM, Carlos Capriotti wrote:
> Being a little bit familiar with Brock's work environment, I think I can
> clarify on this: they have a human, manual system of avoiding those
> conflicts. Only one person/geographical group will use the files at a
> given time.
>
> All that matters then is being able to automate the replication/exchange
> process, so, in this case, the question still needing an answer would
> be, "is there a way to make geo-rep work both ways ?"
>
> Sorry for taking point here, Brock. I thought this would speed up the
> discussion a tad.
>
>
> On Mon, Mar 17, 2014 at 7:23 PM, Alex Chekholko <chekh at stanford.edu
> <mailto:chekh at stanford.edu>> wrote:
>
>
>     You're basically talking about running rsyncs in both directions.
>       How will you handle any file conflicts?
>
>
>     --
>     Alex Chekholko chekh at stanford.edu <mailto:chekh at stanford.edu>
>