topic Re: HP-UX SCSI speed configuration in Operating System - HP-UX

HP-UX SCSI speed configuration

Derek_52 — Thu, 15 Apr 2004 08:57:27 GMT

Hi,

I have a question regarding configuring speeds for the SCSI controller in a rx5670 HP-UX 11.23 ia64 box. The controller is only doing 80/Mbs when it should be doing 160/Mbs. The controller is a Ultra160. We have ruled out hard being the cause of the problem. Is there anyway to change the troughput for the SCSI controller? I have found some documentation pointing me towards the BCH, but I can't find the configuration options to change the speed. Any information will help. Thanks.

Derek

Thanks

Re: HP-UX SCSI speed configuration

Steven E. Protter — Thu, 15 Apr 2004 09:00:39 GMT

This stuff is almost always default. Sysadmins never have to mess with it.

First I'd check for a device thats forcing the scsi chain to run more slowly.

Second, I'd see if there is a bad piece of hardware involved.

Last, i'd note that you don'talways get the full throughput on testing scsi speeds. I'm wondering what the test methdology is.

SEP

Re: HP-UX SCSI speed configuration

Derek_52 — Thu, 15 Apr 2004 09:06:38 GMT

All the drives on the chain are capable of doing better than 160. All hardware has been double checked. I agree. These things should be default. I'm really stumped.

Re: HP-UX SCSI speed configuration

Jeff Schussele — Thu, 15 Apr 2004 09:07:18 GMT

Hi Derek,

Yes - I believe the command at the BCH> prompt would be SCSI
From there you can set parms for the on-board SCSI HBAs.
But keep in mind that a SCSI bus will run at the speed of the slowest device connected.
Are you sure all devices connected support & *are* configured for 160?
I'm fairly certain that most DVDs & tapes are not capable of 160...

Rgds,
Jeff

Re: HP-UX SCSI speed configuration

Derek_52 — Thu, 15 Apr 2004 09:08:20 GMT

By the way...the SCSI speeds are being tested via the EFI shell in HP-UX. recconect -r

Re: HP-UX SCSI speed configuration

Derek_52 — Thu, 15 Apr 2004 09:10:01 GMT

there is 3 ultra160 controllers in the machine. the on in concern is plugged in on a deticated PCI-X bus.

Re: HP-UX SCSI speed configuration

Derek_52 — Thu, 15 Apr 2004 09:12:35 GMT

Thanks for the help guys. Still no luck.

Re: HP-UX SCSI speed configuration

Ron Lawson_1 — Fri, 16 Apr 2004 15:56:06 GMT

Hi Derek,

The speed of the EFI boot is limited to 80MB/s with some versions of the SCSI EFI driver. You can determine the speed that HP-UX is using with the "scsictl -c get_target_parms" command, using the disk's raw device file. The output of the command shows the maximum value, and the value that has been negotiated between the initiator and the target.