× The internal search function is temporarily non-functional. The current search engine is no longer viable and we are researching alternatives.
As a stop gap measure, we are using Google's custom search engine service.
If you know of an easy to use, open source, search engine ... please contact support@midrange.com.



Thanks for that link.  I'm curious about your statement "I'd recommend the
2780 with cache backup - if you lose that much cache
in a failure, you're basically guaranteed a reload."

I thought the 757MB write cache on the 2757 was battery backed.  It is,
right?

"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?



--
This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing
list To post a message email:
MIDRANGE-L@xxxxxxxxxxxx To subscribe,
unsubscribe, or change list options,
visit: http://lists.midrange.com/mailman/listinfo/midrange-l
or email: MIDRANGE-L-request@xxxxxxxxxxxx
Before posting, please take a
moment to review the archives at http://archive.midrange.com/midrange-l.



CONFIDENTIALITY NOTICE:  This e-mail communication, including attachments,
is covered by the Electronic Communications Privacy Act, 18 U.S.C.
2510-2521, is confidential, and may be legally privileged.  If you are not
the intended recipient or believe you received this communication in error,
please reply to the sender indicating that fact and delete the copy you
received.  In addition, retention, dissemination, distribution, copying, or
otherwise use of the information contained in this communication is strictly
prohibited.  Thank you.

-- 
This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing
list
To post a message email:
MIDRANGE-L@xxxxxxxxxxxx
To subscribe, unsubscribe, or change list options,
visit: http://lists.midrange.com/mailman/listinfo/midrange-l
or email: MIDRANGE-L-request@xxxxxxxxxxxx
Before posting, please take a moment to review the archives
at http://archive.midrange.com/midrange-l.






As an Amazon Associate we earn from qualifying purchases.

This thread ...

Follow-Ups:
Replies:

Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2024 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.