Re: small i & power systems (disk performance)

Pete Massiello wrote:

The M25 will support the 8 SAS drives in the CAC AND the additional 12 SAS
drives in the 12S expansion disk draw. It doesn't matter if you have one or
two processors turned on.
The M15 will only support the 8 SAS drives in the CEC.

Pete

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Kirk Goins
Sent: Thursday, April 24, 2008 5:08 PM
To: Midrange Systems Technical Discussion
Subject: Re: small i & power systems (disk performance)

Keith Carpenter wrote:

running our end of month processing.

The BP has collected performance data and suggested 12x 4327 in CEC and 5095 w/5583 (5777 w/cache). I've asked for more details on the analysis.

The 525 will only do 8 drives in the CEC (CPU) so I'm guessing that they are suggesting 4 in the CEC with Raid5 and 8 in the 0595 or 2 mirrored in the CEC and 10 in the 0595. either way the bulk of the disk space is outside the CEC.

The M25 only uses SAS drives in the CEC and you need a dual core model to support the SAS Expansion unit. You could do 4 SAS drives in the CEC and 8 SCSI (4327s) in the 0595. In any case the drives and controllers will way out perform you old stuff :)

I stand partially Corrected... 6 drives in the CEC, its the memory limited on 1 vs 2 Core

From the IBM Announcement
*Both the one- and two-core Power 520 servers include:*
. IBM i user license entitlements
. Full 5250 OLTP capability
. Five PCIe/PCI-X DDR slots
. *Up to six hot-swap SAS disk drives in the system unit*
. Imbedded SAS disk/tape/DVD controller
. Optional 175 MB write cache with auxiliary write cache protection
. One Integrated Virtual Ethernet (IVE) adapter with up to four ports
. One media bay for a SAS tape drive
. One media bay for a DVD-ROM or DVD-RAM drive
. Redundant, hot-swap power and cooling capability
. EnergyScale technology

*In addition, the one-core system features:*
. Up to 4300 CPW
. Up to 16 GB of memory

*The two-core system features:*
. Up to 8300 CPW
. Up to 32 GB of memory
. Option to attach either an HSL/RIO I/O loop or a 12X I/O loop and associated I/O
drawers/towers
. Option to attach an SAS or SCSI disk expansion drawer

And as a lovely side note.. the M25 nad M15 do not support IOPs in the CEC