Thread View: comp.sys.next.hardware
2 messages
2 total messages
Started by Robert La Ferla
Sat, 03 Feb 1996 20:45
NEXTSTEP 3.3 patch, Adaptec 2940 and Command Queueing
Author: Robert La Ferla
Date: Sat, 03 Feb 1996 20:45
Date: Sat, 03 Feb 1996 20:45
34 lines
1390 bytes
1390 bytes
Has anyone gotten this to work? I have tried this with a few different configurations without success. I am thinking that NeXT's driver is just broken. I get system panics and corrupted disks (repairable via fsck) Configuration #1: Adaptec 2940N, Seagate ST12550N, NEC 4Xi Configuration #2: Adaptec 2940N, Seagate ST12550N, Toshiba XM-3601 Configuration #3: Adaptec 2940UW, Seagate ST32550W, Toshiba XM-3701 Note: I've tried all versions of the 2940 driver up to 3.37. Note that both Seagate drives support command queueing. When I run Adaptec's DOS/Windows SCSI programs, it shows that they support it. All the CD-ROM drives DO NOT support it. Is it the case that all peripherals on the bus need to support command queueing? Also, how much of a benefit is command queueing anyhow? Robert La Ferla Registered OPENSTEP / NEXTSTEP Consultant Boston, MA Tel: + 1 (617) 252-0088 Fax: + 1 (617) 252-0004 E-mail: Robert_La_Ferla@hot.com
Re: NEXTSTEP 3.3 patch, Adaptec 2940 and Command Queueing
Author: John Kheit
Date: Sun, 04 Feb 1996 01:30
Date: Sun, 04 Feb 1996 01:30
35 lines
1841 bytes
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rdl@world.std.com (Robert La Ferla) wrote: > Has anyone gotten this to work? I have tried this with a few > different configurations without success. I am thinking that > NeXT's driver is just broken. I get system panics and corrupted > disks (repairable via fsck) > Configuration #1: > Adaptec 2940N, Seagate ST12550N, NEC 4Xi [snip] > Is it the case that all peripherals on the bus need to support > command queueing? > Also, how much of a benefit is command queueing anyhow? I think you'll find that most CDROM's don't support CMND Queing and that is likely the reason you cannot enable it. If you take off the CDROM and run just your HD with CMNDQ it will likely work. The problem is that Adaptec's don't let you individually turn off CMNDQ for each item on the SCSI bus; not to even mention negotiating optimally with each device (as do DPT controllers). So it is an all or nothing proposition with adaptecs... Fortunatly I have found the difference in performance to be non-existent, so it's no big deal... -- Thanks, take care, later, John Kheit )^> %^) =^) monoChrome, Inc. | New York Law School NEXTSTEP Developer | Opinions expressed represent me only MIME & NeXTmail OK--PPP | http://cnj.digex.net/~jkheit mailto:jkheit@cnj.digex.net | Telepathy...It's coming...
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