[Gluster-devel] Gluster and replication

[Krishna Srinivas]

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
wiki.

Regards
Krishna

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