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John the H23 is the HDV model. Try the L23 and the LDV controllers- it can near match the speeds of fiber . For DASD controllers try the new 2780 controller over the 2757 with 1GB read cache and757MB write cache. Another item was a mix of several different DASD sizes and rpm rates, which is not a performance plus.

Frankly, in a production system, I'd be challenged to cut back to 16% of the original arms and expect continued performance as those bigger drives begin to fill with data or trash.


-----Original Message-----
date: Fri, 13 Aug 2004 10:49:01 -0500
from: "Jones, John (US)" <John.Jones@xxxxxxxxxxxxxxxxxxxxxxx>
subject: RE: More disk arms myth exploded...


I would guess #1: Tape controller. On our 730 using 3580-H23 drives, saves at 70GB/hour over a 6534. On our 830 using the same drive types but a 2729, we get 200GB/hour. The machines have similar RAM, CPW, # disk arms, etc. And really, more than the tape controller it's the SPD bus.

You could also potentially mention the spreading of the data will be
optimal on the 520 as it was a reload. But I don't think it would make
that large of a difference.

John A. Jones
Americas Security Officer
Jones Lang LaSalle, Inc.
V: +1-630-455-2787 F: +1-312-601-1782
John.Jones@xxxxxxxxxxxxxxxxxxxxxxx

-----Original Original Message-----
From: rob@xxxxxxxxx [mailto:rob@xxxxxxxxx]
Sent: Friday, August 13, 2004 10:06 AM
To: midrange-l@xxxxxxxxxxxx
Subject: More disk arms myth exploded...

<snip>

Don't know if it:
1)      was the difference between the 6534 and the 2749 card
2)      the way we have them configured (do we have the tape card on the

520 not sharing a processor with disk and not the same on the 820?)
3)      or the difference between the 520 and the 820

<snip>

Rob Berendt
--
Group Dekko Services, LLC
Dept 01.073
PO Box 2000
Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com

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