RE: Backup using Save Files

["Kendall Kinnear" <Kendall.Kinnear@xxxxxxxx>]

An iASP MIGHT help because it separates the I/Os for the virtual tape
from the rest of the database. This was the recommendation at COMMON
from the Save/Restore gurus. You have to be careful with this because
you have to make sure that the iASP has enough disk arms to support the
I/O rates. Before you ask, nothing has been published yet that I've seen
to figure out the correct configuration.

Last week I was talking with a couple of folks from IBM's Advanced
Technical Support and they disagree with this recommendation. Their
feeling is that spreading the I/Os across all the drives in the system
would perform better.

In other words, at this point in time I think the support is too new to
really understand the right way to setup virtual tape.

Kendall Kinnear
System i5 Architect
Stonebridge
 
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-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Evan Harris
Sent: Wednesday, May 24, 2006 4:03 PM
To: Midrange Systems Technical Discussion
Subject: RE: Backup using Save Files

Hi Al

any clue as to why an IASP would have improved things ?
I would have though the opposite effect would be  more likely.

Regards
Evan Harris

At 05:27 a.m. 25/05/2006, you wrote:
>If you use virtual tape improperly, you could execute the WASTE DISK
SPACE
>command.  Also, on my little system, I am getting worse performance
using
>Virtual Tape than to an ULTRIUM2 tape drive.  If was suggested that we
put
>the image catalogue in an IASP to get better performance.  Also I was
>getting terrible performance going from the virtual tape to the
ULTRIUM2
>tape drive, but there's a PTF to fix that.
>
>Al
>
>Al Barsa, Jr.
>Barsa Consulting Group, LLC