External JBOD connected to a D Class Server

[hp_user_1]

Hello,

I have 2 Diff SCSI cards installed in my D370. When I connect my JBOD (with 4 drives in it) to any of the cards, my server is unable to see any of the disks in it at the PDC level but it can see all internal drives. I removed the termination from the SCSI card as well but still the same problem. The JBOD works fine with other systems. I tried known good Diff SCSI cards but still the same issue.

Please help.

[timmy b.]

Asghar,

I have a couple of thoughts/questions/suggestions for you.

First, are the drives in the JBOD Differential or Single Ended? Typical JBOD for the D class was a Jamaica enclosure, or A3312A. These enclosures could have SE or DIFF drives, but not both on the same bus, A or B.

Second, is the terminator that you are putting on the JBOD of the same type as the drives? Reply with the part number on the terminator if you're not certain.

Third, are you sure the cable is okay? Try another one if possible.

Lastly, check your SCSI IDs. I seem to recall that the internal disks on a D were set to 8,5,4,3.

I hope this helps.

Good Luck - Tim

[Sudeesh]

1. ensure that the JBOD disks are compatible with Diff scsi card you have.

2. Ensure the termination and cable is proper.

3. Verify there is no SCSI ID conflict.

Sudeesh

[hp_user_1]

The SCSI IDs of the internal drives are 4, 5 and 14. The SCSI IDs in the JBOD are 8, 9, 10 and 11. The part # of the terminator is 150-1890-02 and it is differential. All drives in the JBOD are DF.

Thanks

[hp_user_1]

One more thing. The SCSI card is 16-bit differential.

[timmy b. · Accepted solution]

Hello again, Asghar. I've done some more digging for you. (thanks for assigning points!)

The part number you gave for the Terminator does not look like an HP part number. You may wish to try another terminator, or even try with NO terminator on the JBOD.

I am curious about your SCSI addresses. They do not match what HP says should be internal for a D3X0 server. You should have the top slot as EITHER SCSI 4 or 5, and the remaining slots at EITHER 8-11 OR 12-15. This is user selectable via a configuration switch located on the backplane. I believe that it does not matter if you have hard jumpered the drives to something else.

Please disconnect the JBOD and run the following command:
ioscan -fCdisk
and then paste the results in a reply message.

The FWD SCSI card should be an A4107A, part number A2874-69006, which is a 16bit card.

Good Luck - Tim

[Bill Hassell]

Before you go much farther, you must identify whether the external JBOD is HIGH-VOLTAGE fast-wide-differential. HP (and IBM and others) pioneered the use of HV-FWD in the late 80's but it is totally and completely incompatible with any other SCSI interface--period. It requires HV-FWD terminators and can never be connected to any other SCSI device that is not HV-FWD. It is also unique in that the cables can be dozens of meters in length, longer than any other SCSI interface. Unfortunately, the HV-FWD connector looks exactly like standard and low-voltage SCSI connectors.

If your JBOD works with non-HP-UX systems, it is very unlikely to be HV-FWD, so you'll need compatible FWD cards in your D370.

[hp_user_1]

Thanks Tim....

My problem has been resolved. The culprit was the terminator. I replaced it with the one I was using with some other jbod and everything got fixed.

Thanks for all your help.