Re: 2757 Controller Card

Ok, from your link:
"The #2780/#5580 and #2757/#5581 disk controllers with an effective 757MB
write cache provide greater disk performance and can have an auxiliary write
cache IOA to protect the write cache contents."

I'm a little nervous about the "can have" part of that statement.  How do I
check for the existence of the IOA mentioned above?

Thanks. RH

"Haase, Justin C." <justin.haase@xxxxxxxxxxxx>
wrote in message
news:898A55683B5A5E4C8071CE2960E1E2B201B8AC06@xxxxxxxxxxxxxxxxxxxxxxxx

The redbook knows.  There's charts inside.

www.redbooks.ibm.com - search for System Builder

When you read that redbook, there's charts about specific disks which
answer some of your query - however, not sure where you'd find an
official "I/O per second sustained" number.  The more cache the better.
I'd recommend the 2780 with cache backup - if you lose that much cache
in a failure, you're basically guaranteed a reload.
---------

The #2757 PCI-X Ultra RAID Disk Controller is an Ultra SCSI disk unit
controller
with a 757 MB compressed maximum cache that provides RAID-5 protection
for
internal disk units. It also supports up to two internal tape devices,
CD-ROM, and
DVD units. The #2757 has four Ultra SCSI buses.
The #2757 is not supported in the system unit of Models 520, 550, 570,
or 595.
A minimum of three disk units of the same capacity is needed for a valid
RAID-5
configuration. A maximum of six arrays is allowed per controller, with a
maximum
of 18 disk units allowed per array.

The #2780 PCI-X Ultra RAID Disk Controller is an Ultra4 (u320) SCSI disk
unit
controller with a maximum compressed write cache of 757 MB and a maximum

compressed read cache of 1GB that provides RAID-5 protection for
internal disk
units. It also supports up to two internal tape devices, CD-ROM, and DVD
units.
The #2780 has four Ultra4 SCSI buses.
The #2780 is not supported in the system unit of the Model 520, 550,
570, or
595. Up to 20 disk units per #2780 are supported in a #5094 PCI-X
Expansion
Tower attached to a Model 520, 550, 570, or 595.
A minimum of three disk units of the same capacity is needed for a valid
RAID-5
configuration. A maximum of six arrays is allowed per controller, with a
maximum
of 18 disk units allowed per array.


--
Justin C. Haase - iSeries System Engineer
IBM Certified Systems Expert - System i
Kingland Systems Corporation

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On

Behalf Of Ryan Hunt

Sent: Tuesday, July 18, 2006 9:27 AM
To: midrange-l@xxxxxxxxxxxx
Subject: 2757 Controller Card

Anyone know how much data the 2757 Controller Card can handle?  Is it
U320?
More importantly, how many I/O's per second can it sustain?



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