Hello, we full backup our 19 GB DB (used 80%) in 75 minutes, using Magstar
3590E cartridges in the 3494 robotic.

Processor in Hitachi Pilot27, 120 mips, OS/390 2.9

Regards,

René Lambelet
Nestec S.A. / Informatique du Centre 
55, av. Nestlé  CH-1800 Vevey (Switzerland) 
*+41'21'924'35'43  7+41'21'924'28'88  * K4-117
email rene.lambelet AT nestle DOT com
Visit our site: http://www.nestle.com

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> -----Original Message-----
> From: Zoltan Forray/AC/VCU [SMTP:zforray AT VCU DOT EDU]
> Sent: Wednesday, June 27, 2001 3:37 PM
> To:   ADSM-L AT VM.MARIST DOT EDU
> Subject:      Database backup performance
> 
> Any suggestions on how to improve DB backup performance ?
> 
> Doing a FULL DB backup of our 15GB ADSM (yes, not TSM YET. Hoping to
> convert to 4.1.3 RSN !!) server, sometimes takes 4-hours.
> 
> Since I read a previous message about someone having a 52GB DB, I was
> wondering how long it takes to backup that much DB since my meager DB
> takes
> sooooo long ? Note, there is no "operator delay" since it goes to a 3494
> ATL, using 3490E drives. I was thinking about moving it to 3590 MAGSTAR
> but
> wasn't sure if it would make much of a difference since the only real
> change would be reduction/elimination of tape mounts (currently uses
> 9-cartridges). Since it is a robot, this would save a few minutes at most.
> 
> I have tried increasing the BUFPOOL value (from 32MB to 80MB) with little
> noticable improvement. I still haven't reached/sustained the illusive 98%
> Cache Utilization !
> 
> Since the ADSM address space working set size has often exceed 110MB, I
> was
> wondering what was reasonable (or expected) for thise size DB. How much
> further should I increase the BUFPOOL value ?
> 
> ===========================
> Zoltan Forray
> Virginia Commonwealth University
> University Computing Center
> e-mail: zforray AT vcu DOT edu
> voice: 804-828-4807