Re: Cabling question -- MIDRANGE-L

Rob,

Custom Card Identification Number (CCIN) 574F is an auxiliary-write cache
IOA that provides 1.5 GB of (compressed) auxiliary-write cache when paired
with a RAID disk controllers.

- The 574F auxiliary-write cache IOA can be used with the 5738, 5777,
2780, 2757, disk controllers.
- The 574F can be used as a replacement IOA for the 5708 auxiliary-write
cache IOA.
- The 0641 includes a direct attach 2780 Peripheral Component
Interconnect-X (PCI-X) Ultra4 RAID Disk Controller and a CCIN 574F
auxiliary-write cache IOA.
- The 0649 includes a direct attach 5738 PCI-X Quad-Channel Ultra320
SCSI RAID Adapter and a CCIN 574F auxiliary-write cache IOA
- The 5582 includes an IOP-based 5738 PCI-X Quad-Channel Ultra320 SCSI
RAID Adapter and a CCIN 574F auxiliary-write cache IOA.
- The 5583 includes an IOPless, 5777 PCI-X Quad-Channel Ultra320 SCSI
RAID Adapter and a CCIN 574F auxiliary-write cache IOA
- The 5590 includes a 2780 PCI-X Ultra4 RAID Disk Controller and a CCIN
574F auxiliary-write cache IOA.

The auxiliary-write cache IOA mirrors the write cache of the
disk-controller IOA to which it is connected. If a failure occurs to the
write cache of the disk-controller, the auxiliary-write cache IOA provides
a backup copy during the recovery of the failed IOA.

The disk controller IOA and the secondary, auxiliary-write cache IOA each
require one PCI-X slot and must be installed together in the same
enclosure. The disk controller IOA and the auxiliary-write cache IOA are
connected by a SCSI cable (provided). The connecting SCSI cable is attached
to SCSI bus port 3 of the disk controller IOA, reducing the number of SCSI
buses that support disk drives from four to three. The reduction of SCSI
buses can also reduce the number of disk drives supported by the disk
controller, depending on the enclosure in which the disk controller is
installed. No disk drives are driven by the auxiliary-write cache IOA.

That was exactly the case i meant. The 574F is the aux cache card that
mirrors the 571E's cache (in some cases RAID cannot be enabled if the aux
cache card is not installed).

Back to your 0595,
If it's connected, don't you see the disks on the LPAR? maybe they are IBM
i disks? (remember the 522 vs 512 byte per sector issue)

Best Regards,

On Tue, Nov 5, 2013 at 10:13 AM, <rob@xxxxxxxxx> wrote:

Got your picture. The darn thing already looks like that!
Then why does one of my IBM i lpars,
which uses all 12 disk drives of the other 0595,
have a cable spanning these two cards (571E 574F)?
System Expansion Unit 0595-001 FR03
Backplane 28BE P07 CB1
Storage IOA * 571E-001 P66 CB1-C01
Storage IOA 574F-001 P68 CB1-C02

Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com

From: rob@xxxxxxxxx
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
Date: 11/05/2013 08:05 AM
Subject: Re: Cabling question
Sent by: midrange-l-bounces@xxxxxxxxxxxx

Wow. Thank you. I am looking forward to that picture.

Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com

From: Roberto José Etcheverry Romero <yggdrasil.raiker@xxxxxxxxx>
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
Date: 11/05/2013 08:02 AM
Subject: Re: Cabling question
Sent by: midrange-l-bounces@xxxxxxxxxxxx

Actually, that 2780 is more than capable of handling the other 6 disks
(unless you want another LPAR). IIRC it has 3 SCSI ports, so you just plug
the SCSI cable that should be dangling around the 0595 into the second
port
off the 2780.
Running a cable between controllers is only done on the "protected cache"
card pairs, like the 5580 and the like.
Besides, a 571A is a very very very slow card, it has no cache and is more
of a "tape controller" card.
I'm taking a picture of one of my 0595's with both bays connected to the
same card and sending it offlist to you.

Best Regards,

On Tue, Nov 5, 2013 at 9:50 AM, <rob@xxxxxxxxx> wrote:

On my 8203-E4A,
on it's Linux lpar,
This:

IOA Hardware Resource Information Details

Manufacturer . . . . . . . . . . . . . . : IBM
Machine Type and Model . . . . . . . . . : 2780001
Firmware Version . . . . . . . . . . . . : 000E0000
Serial Number. . . . . . . . . . . . . . : 07226094
Part Number. . . . . . . . . . . . . . . : 0000042R6927
Plant of Manufacturer. . . . . . . . . . : 004C
Cache Size . . . . . . . . . . . . . . . : 235 MB
DRAM Size. . . . . . . . . . . . . . . . : 200 MB
Resource Name. . . . . . . . . . . . . . : /dev/sg12

Physical location
PCI Address. . . . . . . . . . . . . . . : 0001:c0:01.0
SCSI Host Number . . . . . . . . . . . . : 2
Platform Location. . . . . . . . . . . . : U0595.001.13230A8-CB1-C01
Current Requested Caching Mode . . . . . : Default

controls the 6 disks in the left (from the front) of the 0595. I want

to

add 6 more disks into the right bay. I've procured a 571A card and

stuck

it into U0595.001.13230A8-CB1-C04.

I think I then have to run a 42R4053 cable from C01 to C04 as shown in

one

of our other 0595's. Is this the right cable? Why do I think that?

Well

I have another 0595 and that is what it uses. Granted I didn't confirm
the identity of the two cards it connects.

Yes, I realize this is only temporary as 0595's will not be supported in
the next release and these 6 disks, cable, and card I've just bought is
only temporary.

Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com

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