RE: DIsk conversion question

The disk drives are allocated to this LPAR, I am not sure of the allocation
per lun. OS version 6.1 current on all PTFs.
I was not involved in the initial setup so I apologize for the lack of
concrete data.

Dave

This is a screen shot of the disk status report


Work with Disk Status
H007B65
05/21/12
14:30:5
Elapsed time: 00:00:00



Size % I/O Request Read Write Read Write %

Unit Type (M) Used Rqs Size (K) Rqs Rqs (K) (K) Busy

1 6B22 572662 65.7 .0 .0 .0 .0 .0 .0 0

2 6B22 190887 97.1 .0 .0 .0 .0 .0 .0 0

3 6B22 763549 61.3 .0 .0 .0 .0 .0 .0 0









-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of DrFranken
Sent: Monday, May 21, 2012 12:59 PM
To: Midrange Systems Technical Discussion
Subject: Re: DIsk conversion question

Wellllllllll I woudl say that the person who configured this is not familiar
with the IBM i operating system and it's I/O requirements.

I would strongly recommend that you reconfigure the LUNs to be something
like 150G a piece in your case. This will give you significantly more I/O
capability to the SAN. I'm not sure how the 7,200 RPM comes in to play as
it's just a LUN. However if the operating system is seeing this as a SCSI-2
type of drive (which is what the 7200's looked like) then you have a SERIOUS
bottleneck there and in that case I'd go much smaller on the LUNS.

- Larry "DrFranken" Bolhuis

On 5/21/2012 11:44 AM, ldwopt@xxxxxxx wrote:

I am confused when converting direct attach to a SAN system

Our old system was had 12 127 15k rpm drives. We converted to an LPARed

system with 3 Luns.

#1 572000M 7,200 rpm
#2 191000M 7,200 rpm
#3 763000M 7,200 rpm

I don't have the exact break down but there is supposed to be 60 drives

allocated to the 3 luns.When we tried a test conversion this past weekend a
disk bottle neck occurred during part of the initial start up when selected
files were being reorged.

My thought on correcting the problem would be to:
1. Split the 3 luns into maybe 6 or more smaller units 2. Recreate the
luns using 15k drives 3. Recreate the drives into 6 luns with 15k
drives

Am on the correct track\?
Is there other option to consider?

TIA

Dave Willenborg
FNTS semi-retired
Omaha NE

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