ADSM-L

Re: [ADSM-L] hypothetical situation with dedup turned on

2012-11-15 16:03:09
Subject: Re: [ADSM-L] hypothetical situation with dedup turned on
From: "Tyree, David" <david.tyree AT SGMC DOT ORG>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Thu, 15 Nov 2012 15:58:12 -0500
This a hypothetical situation. 

In this situation the needed tape from the copy pool is not available. 
I realize that the data would be lost but how what you do next? 

if we were still running v5 of TSM we would do a move data (MOVE VOL XXX) to 
save what we could then delete the volume (DEL VOL XXX). We would lose some 
data but the next backup cycle would rebackup any missing active data. 

Since we are now running v6 with dedup it seems like the process would be 
different. Each volume no longer contains a complete set of files. They now 
contain parts of files. 


David Tyree 
Interface Analyst 
South Georgia Medical Center 
229.333.1155 

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of 
Grigori Solonovitch
Sent: Thursday, November 15, 2012 2:58 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] hypothetical situation with dedup turned on

Have you tried to use standard copy pol to recover any problems in primary pool?

Grigori G. Solonovitch
Senior Technical Architect  Ahli United Bank Kuwait  www.ahliunited.com.kw

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-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of 
Tyree, David
Sent: Wednesday, November 14, 2012 10:36 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] hypothetical situation with dedup turned on

                I've had some sys admins ask me about a possible situation with 
using dedup on our primary storage pool. We are currently using dedup and I 
can't come up with a good answer.
                Ok, our primary storage pool is using dedup. Something 
(corruption, whatever) happens to one of the files in the primary pool and the 
data needed to recover the file in the primary pool is not available.
                I attempt to do a restore of the corrupt  file and the needed 
tape is not available.
                How would I go about fixing that kind of a situation?
                Back before we started using dedup we could just do a move 
volume to save what we could and then do a delete volume and the next backup of 
the server would straighten everything out. We might lose inactive copies but 
the next backup cycle would catch the missing active files.
                With the way dedup works I'm not sure what we would do.
                Any suggestions?

David Tyree
Interface Analyst
South Georgia Medical Center
229.333.1155


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