> I am curious about the 2940UW drivers for Linux and am also wondering
> if the following is a normal condition and if not... how to fix it:
> (I have marked the area of concern with comments)
First of all, set up your termination in the SCSI BIOS properly:
(if for no other reason than to cut down on this crap at bootup ;)
> Sep 25 14:01:11 server kernel: aic7xxx: Warning - detected
> auto-termination on controller:
> Sep 25 14:01:11 server kernel: aic7xxx: <Adaptec AHA-294X Ultra SCSI
> host adapter> at PCI 9/0
> Sep 25 14:01:11 server kernel: aic7xxx: Please verify driver detected
> settings are correct.
> Sep 25 14:01:11 server kernel: aic7xxx: If not, then please properly
> set the device termination
> Sep 25 14:01:11 server kernel: aic7xxx: in the Adaptec SCSI BIOS by
> hitting CTRL-A when prompted
> Sep 25 14:01:11 server kernel: aic7xxx: during machine bootup.
> Sep 25 14:01:11 server kernel: aic7xxx: Cables present (Int-50 NO,
> Int-68 YES, Ext-68 NO)
> Sep 25 14:01:11 server kernel: aic7xxx: Termination (Low ON, High ON)
Ugh.
> ***** Here is the area of my concern!
> \
> Sep 25 14:01:11 server kernel: scsi0 channel 0 : resetting for second
> half of retries.
> Sep 25 14:01:11 server kernel: SCSI bus is being reset for host 0
> channel 0.
> Sep 25 14:01:11 server kernel: scsi : aborting command due to timeout
> : pid 18, scsi0, channel 0,
> id 0, lun 0 Read Capacity 00 00 00 00 00 00 00 00 00
> Sep 25 14:01:11 server kernel: (scsi0:0:0:0) Using wide (16 bit)
> transfers.
> Sep 25 14:01:11 server kernel: (scsi0:0:0:0) Synchronous at 10.0MHz,
> offset 8.
>
> ***** Shouldn't this be 20.0MHz on a UW?
Yes. Or 40Mb/s (the beta drivers now display transfer rate).
> The drives themselves are 4.3GB IBM UW's... there are two of them but
> the 2nd drive is not in use at this time. My intent is to use it
> as an on-line backup but I haven't configured that yet.
Use the md driver to do RAID1 - much easier than trying to dick about with
backup cron jobs etc.
> What I am concerned about is the timeout and also the 10.0MHz result
> (I thought it should be 20). I'm not sure if I have a problem
> here... everything works and the box has been in production for more
> than 60 days.
First of all, go into the SCSI BIOS and set the SCSI id's which your drives
are on to 40Mb/s. Then set the manual termination properly, and save the
settings.
> One additional piece of information is that when the initial install
> was done I had a horrible time getting the RH install to see the
> 2940UW. I could not do a simple default install and it finally
> worked when I installed from expert mode.
The default kernel with Redhat is notorious for not being able to detect
various bits of hardware properly or at all. I was lucky in that my system
boots off a small IDE drive, so I was able to ignore scsi totally and
recompile a later kernel with just the features I need, including scsi
support for the 2940.
My system has identical SCSI gear to yours - a 2940UW controller and two
IBM 4.3Gb UW drives (I'm using RAID0 though since I want 8Gb of space on
the one mount point :)
It's running one of the 2.0.36 pre patches from Alan Cox, I forget which
(from memory it's #7) as it was continually bit by the route cache bug in
previous kernels. I also had lots of scsi-related problems until plugging
in one of Doug Ledford's beta scsi drivers (v5.1.0p7). Not only did the
problems disappear, but both drives were recognised as having 40Mb/s
transfer rate (as they do).
Squid still segfaults on the box every few days, but that's better than
every few hours like it used to, with kernel oops' taking the whole server
down. I still haven't been able to track down why, perhaps it's having
two 128Mb SDRAM chips on a TX board (it's not processor, cache or swap).
-- Matt- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/