[Gluster-devel] Gluster and replication

Krishna Srinivas krishna at zresearch.com
Tue Apr 17 12:10:13 UTC 2007

Hi John,
Reply inline...

On 4/17/07, John Rowe <rowe at excc.ex.ac.uk> wrote:
> I have a few questions about setting up a pair of mirrored servers.
> Basically I have an existing user file system and I would like it to
> become a bit more robust.
> * Is there a simple way of taking an existing file-system and making it
> into a brick? A short shutdown to move files within the same file-system
> would not be a problem but copying the data to another machine would be
> a pain particularly because of the synchronisation issues.

As of now we have to manually sync using rsync. But auto-sync is
in our road map. So you have to make sure that source file directory
tree is not being modified while you do rsync.

> * What happens when one machine goes down and comes back up again? There
> was discussion in the archives about automatic recovery in 1.4, this
> sounds great but what happens in 1.2? I'm thinking of both graceful
> shutdown and hardware failure.

As of now in 1.2, 1.3 you have to manualy fix the server which went
down and bring it in sync with the server which was up. This will be
done during a downtime.

> * What will "features/mirror" add? I'm assuming that 1.2 will already do
> the basics via afr.

features/mirror is actually old name for features/afr, I will update the


> Thanks for all your work on gluster, it looks like the answer to a lot
> of people's problems!
> John
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