[Linux-cluster] Unformatting a GFS cluster disk

[chris barry]

On Wed, 2008-03-26 at 10:41 -0500, Wendy Cheng wrote:
> DRand at amnesty.org wrote:
> >
> >
> > ......The disk was previously a GFS disk and we reformatted it with 
> > exactly the same mkfs command both times. Here are more details. We 
> > are running the cluster on a Netapp SAN device.
> 
> Netapp SAN device has embedded snapshot features (and it has been the 
> main reason of choosing NetApp SAN devices for most of the customers). 
> It can restore your previous filesystem easily (just few commands away - 
> go to the console, do a "snap list", find your volume that hosts the lun 
> used for gfs, then do a "snap restore"). This gfs_edit approach (to 
> search thru the whole device block by block) is really a brute-force way 
> to do the restore. Unless you don't have "snap restore" license ?

Wendy,

We too are using a NetApp. There was talk amongst out IT group that
these snaps would not work against a raw lun.

Can you point me at any docs that describe how best to implement snaps
against a gfs lun?



Regards,
-C