Re: 2757 Controller Card

At 10:54 AM 7/18/2006, Ryan Hunt wrote:

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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