while not beeing DB2 expert in any way I have my 2 cents:

assuming both scenarii perform full backup,
I suspect online backup backups only used database space (which size you did 
not mention)
while offline backup, obviously, backups up the whole - reserved space,
and you maybe do not use compression on the tsm client, and maybe not even on 
tapes.
Just a guess, go give it a check

Juraj


> -----Ursprüngliche Nachricht-----
> Von: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] Im 
> Auftrag von Muthyam Reddy
> Gesendet: Mittwoch, 02. Februar 2005 19:28
> An: ADSM-L AT VM.MARIST DOT EDU
> Betreff: DB2 offline backups
> Wichtigkeit: Hoch
> 
> ** High Priority **
> 
> Hi,
> We have DB2 database of size 530GB and it takes 3hrs time for 
> online backup with 4 tsm drives. When tried with same TSM/DB2 
> parameters and drives for offline backup it taking 7hrs. I 
> know it should take far less time for offline backups compare 
> to online.  I appreciate if any one can share their ideas to 
> improve offline backup window time.
> Meanwhile I will search docs for anything I have to change.
> 
> thanks and regards
> muthym
> 
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