[lustre-discuss] undelete

[Dilger, Andreas]

On Apr 27, 2017, at 05:43, E.S. Rosenberg <esr+lustre at mail.hebrew.edu> wrote:
> 
> A user just rm'd a big archive of theirs on lustre, any way to recover it before it gets destroyed by other writes?

Just noticed this email.

In some cases, an immediate power-off followed by some ext4 recovery tools (e.g. ext3grep) might get you some data back, but that is very uncertain.

With ZFS MDT/OST filesystems (or to a lesser extent LVM) it is possible to create periodic snapshots of the filesystems for recovery purposes.  ZFS handles this fairly well performance wise, LVM much less so.  With Lustre 2.10 there are new tools to manage the ZFS snapshots and allow mounting them as a separate Lustre filesystem.

Cheers, Andreas
--
Andreas Dilger
Lustre Principal Architect
Intel Corporation