RE: 515 Configuration Funny

[Glenn Ericson <glenn-ericson@xxxxxxx>]

The number of arms,  controllers, and rotational speed all count in performance


At 12:23 PM 4/16/2007, Lukas Beeler wrote:
> 2.5" Drives are usually faster than their 3.5" counterparts at the same
> rotational speed. They have smaller platters.
>
> Also, 16 2.5" drives at 10kRPM will outperform 8 3.5" drives at 15kRPM
> anyway.
>
> -----Original Message-----
> From: midrange-l-bounces@xxxxxxxxxxxx
> [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Jones, John (US)
> Sent: Monday, April 16, 2007 6:19 PM
> To: Midrange Systems Technical Discussion
> Subject: RE: 515 Configuration Funny
>
> There are no 140GB 15K RPM SAS drives.  Seagate is just this month
> shipping their very first 15K 2.5" SAS drives in 36 & 73GB sizes.
> Hitachi doesn't offer 10K RPM 2.5" disks let alone 15K units.
>
> I don't think IBM had much choice in drive formfactor this time around.
>
> --
> John A. Jones, CISSP
> Americas Information Security Officer
> Jones Lang LaSalle, Inc.
> V: +1-630-455-2787 F: +1-312-601-1782
> john.jones@xxxxxxxxxx
>
> -----Original Message-----
> From: midrange-l-bounces@xxxxxxxxxxxx
> [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Lukas Beeler
> Sent: Monday, April 16, 2007 11:08 AM
> To: Midrange Systems Technical Discussion
> Subject: RE: 515 Configuration Funny
>
> The default is also 1GB of memory, which in my opinion isn't even enough
> to run V5R4 in it's default configuration.
>
> The 70GB disks make a lot more sense, because with 2x36GB (as it was
> usus with the Express models of the 520) you didn't even have enough
> room for an i5/OS and CUMPTF image catalogs.
>
> The prices for the disks and memory is also rather insane, compared to
> technologically similar System x drives/memory.
>
> And if IBM had switched to 2.5" SAS drives, it would also be possible to
> have up to 16 arms in the 4U CEC.
>
> Does the 515 still need the additional disk plane to use 8 disks instead
> of 4?
>
> -----Original Message-----
> From: midrange-l-bounces@xxxxxxxxxxxx
> [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Trevor Perry
> Sent: Monday, April 16, 2007 5:43 PM
> To: Midrange Systems Technical Discussion
> Subject: 515 Configuration Funny
>
> So, I am configuring a new 515 Express. I select the defaults, and
> configure. It adds the mirroring feature and 2 x 70GB drives.
>
> I review the messages, and I am told:
> "You have chosen a disk configuration that may impact system
> performance."
>
> Ha! that is the DEFAULT configuration that IBM provided!!!
>
> I read further:
> "Please review the number of disk arms in this configuration to ensure
> it will meet the customer's requirements and provide acceptable
> performance."
>
> I guess this is another case of one arm forgetting to tell the other...
>
>
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