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Re: [Linux-cluster] Unformatting a GFS cluster disk



chris barry wrote:
On Wed, 2008-03-26 at 10:41 -0500, Wendy Cheng wrote:
DRand 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.

Have you (or IT group) talked to Netapp NGS folks ? I personally don't know whether there is a specific document talking about the interaction between GFS and Netapp SAN. However, remember that Netapp SAN does its snapshots on its volume(s). Now assume you export /vol/vol1/lun1 via FCP or ISCSI that is seen by Linux box as /dev/sda, then, the volume snapshots lists can be found via "snap list" command, if you do have proper licenses in place.

-- Wendy

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



Regards,
-C

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