Re: model 800 disk drive updates

Pat - thanks for the details.
Thanks to all for the other comments.
The drives - 3 more 17gb are on the quote.
No additional hardware.
Then the big install fee.
I don't see a problem (i've put drives in other models before
and added to raid sets).
jim franz

To: "Midrange Systems Technical Discussion" <midrange-l@xxxxxxxxxxxx>
Sent: Friday, February 23, 2007 11:51 AM
Subject: Re: model 800 disk drive updates

About $1500 in profits at first glance.

Here are the specs on the 2782.

I can't find the standard config for the base machine
but it would appear that if you have the slots, the
DASD controller can handle any additional disks.

IBM will sometimes put a physical limit on the
initial number of drives bases on model size.

The base number is usually 4 with the standard power
supply, so you "might" need another power supply.

I assume for $1900 you are getting a expansion unit
or some other major league part...

I went back and found "list prices" from IBM for
17gb drives and they were only $1,000 back 2004.

Used drives should be "around" $500 or less.

#2782) PCI-X RAID Disk Unit Controller

(No Longer Available as of January 1, 2004)

#2782 is a PCI-X SCSI controller with a 40MB cache

that provides RAID-5 protection for internal disks and
also supports internal tape units, CD-ROM and DVD devices.
#2782 has two SCSI buses that support up to 12 disk units.
Hardware data compression is not supported.

In addition to providing RAID-5 protection for disks,
#2782 also works as a high-performance controller for disks
protected by system mirroring, or disks with no protection.
In the RAID-5 configuration, disk unit protection is provided
at less cost than mirroring, and with greater performance than
system checksums.

A minimum of three disk units of the same capacity are needed
for a valid RAID-5 configuration. A maximum of four arrays are
allowed per controller, with a maximum of 12 disk units allowed
per array. All disk units in an array must be of the same capacity.
Parity is spread across either two, four, or eight disk units in an
array. If an array of three disk units is started, parity is spread
across two disk units. If an array of four to seven disk units is started,
parity is spread across four disk units. If an array of eight to twelve
disk units is started, parity is spread across eight disk units.

The number of arrays and size of each array can be influenced by specifying

an optimization of either balance, performance, or capacity in Operations
Navigator when starting arrays. An optimization of balance is the default
when starting arrays from the green screens. If disk units are included

into an existing array, parity may be spread across less than the preferred

number of disk units. In this case the RAID function must be stopped and
started
to redistribute the parity.

#2782 controls up to two removable media devices (internal tape, CD-ROM,
or DVD)

This feature requires OS/400 V5R2, plus updates. Refer to Informational
APAR II13440



Jim Franz wrote:

Customer has asked if I can add 2 - 4318 17gb drives to a model 800.
Install quote(not including drives) from IBM or partner was $1900 and
none of us can figure what is so hard about this.
This is smallest 800 with 3 drives raided
on 1st controller-2782-001
17gb - 6718-070
17 gb  - 6718-078
17gb  - 6718-078

I looked at system builder & it appears there are 6 slots in front of machine.

what am I missing?
Jim Franz

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