topic Re: SCSI JBOD & D Class Server in Operating System - HP-UX

SCSI JBOD & D Class Server

hp_user_1 — Fri, 27 May 2005 18:43:48 GMT

Hello,

I have a SCSI JBOD with 6 drives in it. It is connected to a D Class server running HPUX 11i. When I do 'sea' at the PDC level I see all disks with their proper SCSI IDs but when I boot the server and do an ioscan I only see the ones inside the server and not the ones in the array. I have changed the SCSI card and the cable with known good ones. All internal as well as the array drives have unique IDs. Please help.

Re: SCSI JBOD & D Class Server

Mel Burslan — Fri, 27 May 2005 20:17:48 GMT

Looks like your kernel does not have the drivers for the SCSI Bus adapter card you have on your D-Class machine. Of course when the bootstrap is looking for all hardware, it is probing every resource it can, hence can see the disks as SCSI devices responding to query. But once the HPUX takes the helm, it does not know how to talk to those guys because it is not even aware of the SCSI adapter it has. You need to figure out the SCSI card model and load the necessary kernel drivers then recompile your kernel. You should be in business in no time.

Good luck.

Re: SCSI JBOD & D Class Server

hp_user_1 — Fri, 27 May 2005 23:28:11 GMT

The SCSI driver is claimed at the hpux level. The first time I connected the jbod and booted hpux it saw all devices but when I rebooted the box it saw none of them. I changed the SCSI adapter, SCSI cable to the jbod as well. The SCSI bus is terminated at the jbod too.

Re: SCSI JBOD & D Class Server

Sudeesh — Sun, 29 May 2005 03:15:59 GMT

Hi,
1. How many SCSI controllers exist in the system? is both internal and JBOD is connected to same controller?

2. From which disk/controller the system is booting?

Probably your answer will help us to point out the issue.

Sudeesh

Re: SCSI JBOD & D Class Server

Steven E. Protter — Sun, 29 May 2005 03:50:16 GMT

If you have two D class servers hooked up to the jbod:

The problem is the default scsi id on both scsi cards connected to the jbod is the same, probably 7.

You have to shut the machine down and change the dip switches on one of the scsi cards.

Then ioscan will show the disks on both servers.

The same symptoms can arise when there is improper scsi termination.

SEP

Re: SCSI JBOD & D Class Server

hp_user_1 — Sun, 29 May 2005 09:12:37 GMT

The behavior I noticed now is little different.

There are 2 9gb internal disks in the server and the server sees them well. However, the drives in the jbod are seen at the PDC level only and not by ioscan. There is only one SCSI card inside the server. The scsi bus is terminated at the jbod. The card's ID is 7, the internal disks are 5 and 8. The disks in the jbod have unique IDs other than 5, 7 and 8.

Regards,