Thorsten,

Be careful with the way you word things.

Saying "the data will move to the snapshot area" implies that data is actively copied out like in other vendors snapshot implementations (Compaq/HP Virtual Replicator, EMC SnapView, etc) which would generate a negative performance impact and the potential for snapshot failure, which are two issues that are suffered by the other vendor products. The ability to do "passive" snapshots as a side-effect of the no-update-in-place policy of WAFL is a major differentiator for Network Appliance.

Rather, say "the data is no longer marked as part of the active filesystem". It's still protected by the snapshot block map of course, until all the relevant snapshots are deleted.

Alan.

-----Original Message----- From: Thorsten.Lemke@computacenter.com [mailto:Thorsten.Lemke@computacenter.com] Sent: Wednesday, 15 October 2003 8:13 PM To: paul.winchcombe@ukgateway.net Cc: toasters@mathworks.com Subject: Re: Deleting qtree

Hi Paul,

you don't have to worry about any snapshot settings before deleting a qtree.

The blocks in your qtrees are already marked as belonging to serveral snapshots if the data already exists for some time (what I assume). Once this has happened you can't do anything about it. If you delete your qtrees, the data will move to the snapshot area. The remaining qtrees are not affected. You are not able to differentiate between snapshots of different qtrees as a snapshot is always taken of a whole volume.

For some details about snapshots follow this link:

http://www.netapp.com/tech_library/3002.html

Regards

Thorsten Lemke

"paul.winchcombe@ukgateway.net" yxm16@ukgateway.net@mathworks.com on 14.10.2003 10:49:24

Please respond to paul.winchcombe@ukgateway.net

Sent by: owner-toasters@mathworks.com

To: toasters@mathworks.com cc: Subject: Deleting qtree

--------------------------------------------------------------------------

Hi,

Just after any information of what is the best way to delete a qtree. My problem is this - I have a volume about 1TB which has 5 qtrees, I want to delete 2 qtrees but keep the snapshots of the 3 remaining.

If I turned snapshot off for the volume before running the delete, then deleted the files would this work ?

Regards

Paul

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