RE: 5727 and 5776 (520+ disk options)

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
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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?  ;)