|
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Good points... I hadn't even thought about splitting them for the benefit
of having 2 parity sets.
This box runs Domino and Websphere and had some DASD performance issues on
the current box (Model 800) when it was originally bought with a 5702
driving 6 mirrored drives(!). I researched, proposed, and got a 2757 put
into the current 800 which resolved the problems. With the 520 boxes, I
can't get a 2757, 2780, or 5580 setup in the CEC and we are trying to avoid
adding an expansion unit for this 'simple' box. I'm trying to get maximum
performance from the lesser controllers we're pushed towards with a basic
520 setup. IMO it really sucks not being able to run a 757mb cache
controller in the 520 CECs.
In general it sounds like splitting them 4 and 4 would perform better (with
the mixed 40mb and 90mb cache amounts) than driving all 8 from the higher
cache controller? They would all be the 35gb 15k drives.
"Chris Bipes"
<chris.bipes@cros
s-check.com> To
Sent by: "Midrange Systems Technical
midrange-l-bounce Discussion"
s@xxxxxxxxxxxx <midrange-l@xxxxxxxxxxxx>
cc
05/30/2006 03:50 Subject
PM RE: 5727 and 5776 (520+ disk
options)
Please respond to
Midrange Systems
Technical
Discussion
<midrange-l@midra
nge.com>
1. do you have an HMC, if so, you can move your load source by creating
a partition so you should be able to drive all 8 drives off the 5776,
but for a normal system I do not think you can use the 5776 as the load
source.
2. what is your goal for these drives? Performance or protection? You
get better performance with two RAID sets on two controllers. You also
achieve controller level redundancy. My understanding is running 8
drives on the embedded controller is a performance hit, especially with
15K drives. If you are running slower 10K drives of the same size, I
think the embedded controller can keep up with 8 drives.
Like you said, "It depends: ;)
Christopher Bipes
Information Services Director
CrossCheck, Inc.
-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
ChadB@xxxxxxxxxxxxxxxxxxxx
Sent: Tuesday, May 30, 2006 12:29 PM
To: Midrange Systems Technical Discussion
Subject: 5727 and 5776 (520+ disk options)
Ok... Who's familiar with the 520+, 5727 (embedded 40mb cache RAID
controller), and 5776 (90mb cache PCI-X RAID controller)?
It looks like I can put a 5776 in our new 520+'s CEC, but i'm trying to
figure out for sure if I can drive all 8 drives in the CEC with it. One
item i'm reading makes me think I have to drive the 4 drives in the base
slot with the embedded 5727 controller. Does anyone know this for sure?
If I can drive them all with the 5776, would it be better to drive them
all with the 90mb controller, or split them with each controller driving
4
drives? "It depends", right? ;)
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