From: Peter McKay (Peter.McKay@INFINITY.CO.NZ)
Date: Wed Jan 28 2004 - 15:07:44 EST
Hello,
The way the p650 is ordered from the factory can result in 2 separate configs.
(1) If the system has not been ordered with the spilt SCSI backplane for the 4 internal host swap disk bay's, then the disks are attached to the internal SCSI controller along with the devices in the media bay's.
(2) If the system is ordered with the split SCSI backplane (needed for LPAR'ing) then the system is cabled from the SCSI backplane to a "extender card: in slot 7, which extends the SCSI bus to allow attachment to 2 SCSI adapters. The devices in the media bay's are connected to the internal SCSI controller. This works fine and is relatively un-complicated.
Hope it helps..
Regards,
Pete.
Peter McKay
Technical Consultant
Infinity Solutions Ltd
PO Box 2640, Christchurch
Ph: 03 963 7965, Mob: 027 230 1884
Fx: 03 963 7941
www.infinitysolutions.co.nz
-----Original Message-----
From: IBM AIX Discussion List [mailto:aix-l@Princeton.EDU] On Behalf Of Michael Schmolders
Sent: Thursday, 29 January 2004 3:27 a.m.
To: aix-l@Princeton.EDU
Subject: Re: p650 internal disks
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Holger.VanKoll@SWISSCOM.COM schrieb:
~ > a p650 has 2 internal scsi-controller.
|
| I noticed that on all of my p650 the 2 internal disks (rootvg) are
| connected to the same controller. Nothing is connected to the 2nd
| controller.
|
| If there are external (non ssa, non san) disks, there is a 3rd and 4th
| scsi-controller to which the disks are connected to.
|
| I see no point in connecting both rootvg-disks to the same controller
| as long there is an unused 2nd controller; neither regarding
| availability nor performance.
|
| But I dont know if this setup is shipped from IBM like this or if it
| is done somewhere @ ibm in my country.
|
| So, could you please tell me if your p650 have the same setup?
|
| If anybody got an idea about any advantage with this setup, please let
| me know.
Hi Holger,
yes, an equivalent configuration in our 650 (7038-6M2):
4 internal disks at 1Z-08-00-x,0 x=8,9,10,11
2 Wide/Ultra-3 SCSI I/O Controller at 1Z-08 and 1Z-09, both "Available"
Viele Grüße - Yours sincerely
Glück Auf
Michael Schmolders
_._. .._
E-Mail: M.Schmolders@HRZ.Uni-Dortmund.DE
Phone: ++49 231 755 2717
http://www.hrz.uni-dortmund.de/Personal/Schm
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