I've been through that situation with two of my customers.

It was about 450GB of archived data which had to exported (using 3590-E1A 
tape drives). It took about 4 hours to bring up an old version of the 
database (we couldn't use a different TSM server an connect it to some 
drives and there was not enough space to bring up a second TSM instance at 
those customers), then it took about 20 hours to export the data, then 
bring the original TSM database back online. Be carefull that you don't 
get TSM client sessions running and deactivate all TSM client and admin 
schedules so that no tapes are being overwritten. At that old TSM database 
time tapes that were scratch then will be with data at the aktual TSM 
time. At least get a full and consistent set of OFFSITE Copy Pool Tapes 
before going "back in time". In a time frame of 20 hours something will be 
missed and the wrong tapes could be overwritten, so consistent OFFSITE 
data is essential.

If you have more question, you can always call or email me directly.

Stefan Gocke

Gocke IT Solutions
Maurerweg 5
D-85649 Brunnthal, Germany

Tel: +49(0)8102-897789      Fax: +49(0)8102-897738
Mobil: +49(0)172-6841213
email: Stefan.Gocke AT t-online DOT de

Tivoli Certified Consultant - TSM V5.1
IBM Certified Advanced Technical Expert AIX V4 and V5
...

"ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU> schrieb am 14.06.2004 
12:53:22:

> Hello.
> I have a problem. Accidentally during delete space all data (archive and
> backup) were deleted. However only backup data were suppose to be 
deleted :(
> 
> The deletion occured about 2 weeks ago, so the rollback operation is a
> little bit difficult.
> Is there any way to restore the missing archive definitions? I suppose 
all
> the data is still on the tapes.
> 
> I'm thinking about restoring TSM database to point in time before 
deletion,
> then export node (do I have to export all archived data?), then 
rollforward
> to current state and import node.
> Is there a chance for it to work? How slow is export node?
> 
> 
> -- 
> Przemysław Maciuszko
> Agora SA