Re: [Moosefs-users] Backing up MFS metadata

[Fabien G. <fab...@gm...>]

Hello Stas,

On Fri, Jul 9, 2010 at 10:15 AM, Stas Oskin <sta...@gm...> wrote:

> Can I also save the change logs, and replay them into meta-data?
> How much time it will be able recover up to point of crash?
>

Yes, you must save everything in /var/mfs/ (or wherever you placed it). When
you launch "mfsmetarestore -a", it will use the last metadata dumpled file
and replay changelogs on it. From that, you'll get an up-to-date metadata
file.

As for the time it takes, it depends on the number of chunks you have, and
the hardware server you use (CPU + HDD speed). For example in our case (15
million chunks, 6 GB of metadata), it takes between 1 and 2 minutes on a
Xeon processor.

Fabien