[Gluster-devel] AFR in actual use

[Krishna Srinivas]

Hi Brent,

On 2/26/07, Brent A Nelson <brent at phys.ufl.edu> wrote:
> Based upon an earlier comment, when AFR comes out in 1.3 on Wednesday, it
> will happily replicate data as it is changed, but a node that goes down
> won't resync itself with any changes made while it was down when it comes
> back up.  Resyncing would be done in a future release by an fsck process.
> Is that correct?

Yes, We will have fsck do it ( we may also have another tool to do it)

>
> If so, some questions:
>
> 1) Version 1.3 won't be usable as a fault-tolerant clustering filesystem,
> although 1.4 might be, right?
1.3 will just replicate data. resyncing part is not done yet.

> Would there be a crude method of resyncing
> manually (such as rsyncing the underlying filesystems), at least for
> testing until 1.4 is out?
As of now, you have to mount the two bricks and sync them manually.
(you can use rsync)

> 1a) Similarly, what about adding replication to an existing area that
> already has data?
For this, you can sync first and then use the node for AFR.

>
> 2) In 1.4, would the fsck resync occur after the out-of-sync node has
> already reconnected as a replica? If not, how would you ensure that you
> pull in all the changes made while the fsck is running (but before AFR
> kicks in)?
Proably others can give inputs on this. We need to discuss on this.

Thanks
Krishna

>
> Thanks,
>
> Brent
>
>
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