RE: Backup using Save Files

Don,

I have copies of two presentations from COMMON that say 'for best performance' 
place the virtual tape images in a separate ASP. 

Sounds like they have backed off that a little now. Probably a good thing since 
a separate ASP doesn't necessarily mean good performance.

Kendall Kinnear
Consulting System i5 Architect
Stonebridge

Phone: 214-676-3146
email:   kendall.kinnear@xxxxxxxx

Sent from Windows Mobile 5

-----Original Message-----
From: "Don" <dr2@xxxxxxxx>
To: "Midrange Systems Technical Discussion" <midrange-l@xxxxxxxxxxxx>
Sent: 5/24/06 9:20 PM
Subject: RE: Backup using Save Files


Ken,

this is interesting.  As I recall the speakers at the iSeries Tech conf 
(and they still refered to it as an AS/400) were suggesting a iASP for 
virt.tape...qualified with standard IBM answer #4 - "it depends...."

BTW, had a GREAT time at the tech conf...food was great! :)  My 
cardiologist was really annoyed with I hit the scales upon my return. :)

Don in DC

At 06:17 PM 5/24/2006 -0500, you wrote:
>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
>
>Direct Telephone Number: 972.419.7709
>Or Toll Free:  800.776.9755 x7709
>Cell Phone Number:  214-676-3146
>Fax Number:  972.455.7260
>Kendall.Kinnear@xxxxxxxx
>http://www.SBTI.com/
>If you are interested in iSeries and application development, follow
>Angus' blog at http://www.angustheitchap.com/
>-----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
>
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