I've had similar problems with that controller, with sca converters. I'm
using seagate (ST39171WC). I must have gone through a dozen SCA
connectors BEFORE I found one that seemed to eliminate the problem. In my
experience, those SCA adapters are very finnicky (shaky, delicate,
whatever you wanna call it). I have a local dealer who carries a wide
range of them, so it was easy for me to just keeping going back, until I
found one that eliminated the problem, and ever since, I've not
experienced any scsi bus resets or scsi problems.
If it helps, I went through various stages of experimentation, to make
sure it was not the controller, or the drive. I've four of those
controllers (because an internet dealer was offering them for $50 a
piece). So I tried the various controllers with the offending SCA
adapters, and used different drives; still got the same scsi bus reset
errors.
This just leads me to think that the quality of the SCA adapters is
absolutely critical, but the problems that they all look pretty much the
same, it is hard to conclude which one is better.
Ok, I've gone on too far.
good luck
robert
On Mon, 15 May 2000, Brian Leeper wrote:
>
> Essentially, it seems to die with a bunch of SCSI bus resets under heavy
> disk I/O (as when mounting a disk). It'll stop accessing the drive after a
> second or two, pause for 5-10 seconds, then the endless SCSI bus
> resets start.
>
> I'm using an IBM DGHS09Y 9GB SCA drive (also tried a Seagate ST32430WC,
> and a Hitachi DK319H-18WC), with an SCA convertor (has both narrow and
> wide connectors) and a multimode LVD/SE terminator (I've tried three
> different ones so far) plugged into the last connector on the SCSI cable
> (the SCA convertor does not have termination), which I've tried various
> versions thus (none of these cables are more than 36 inches long):
>
> 1)The PVC 3-connector cable supplied with the Tekram card. 8" between term
> connector and connector the drive is plugged into.
>
> 2)A Teflon 5-connector cable, with 4" between term connector and drive
> connector.
>
> 3)A "twist 'n' flat" LVD-rated 5-connector cable, with 1/2" between drive
> connector and term connector.
>
> I've also tried slowing the SCSI bus down to 10MHz instead of 20MHz (also
> tried disabling tagged commands and disconnection). If anything, that
> should have fixed the problem if it were due to a cabling or termination
> issue, but that didn't help much at all. Getting rid of the PVC cable
> helped somewhat, but I suspect that the PVC cable was intermittent anyway.
>
> This controller uses the Symbios Logic SYM53C875 Ultra-Wide chipset, and
> I'm using the sym53c8xx driver with Linux (a Tekram-supplied driver is
> available for this card, but I'm not sure how it differs from the
> Linux-supplied driver so I haven't tried it).
>
> The same drive, when plugged into a narrow-channel Adaptec 2940, works
> flawlessly at 10MHz with a Seagate 2160N terminating the bus.
>
> I'd also had this problem with the SYM53C875 controller found on the Intel
> NL440BX "Nitelite" motherboard, with completly different hard drives
> (Seagate) with active termination on the drive (no SCA convertors), but I
> didn't pursue it then since there were other reasons for not using the
> NL440BX motherboard (it only has 3 DIMM slots).
>
> Below are some snips from the log (this error occured with both the stock
> 2.2.14 driver and the new patch found on
> ftp://ftp.tux.org/pub/people/gerard-roudier):
>
> May 14 13:27:58 test kernel: scsi : aborting command due to timeout : pid
> 1905,
> scsi1, channel 0, id 4, lun 0 Read (6) 00 00 30 08 00
> May 14 13:27:58 test kernel: sym53c8xx_abort: pid=1905 serial_number=1926
> serial_number_at_timeout=1926
> May 14 13:27:58 test kernel: SCSI host 1 abort (pid 1905) timed out -
> resetting
> May 14 13:27:58 test kernel: SCSI bus is being reset for host 1 channel 0.
> May 14 13:27:58 test kernel: sym53c8xx_reset: pid=1905 reset_flags=2
> serial_number=1926 serial_number_at_timeout=1926
> May 14 13:27:58 test kernel: sym53c875E-0: restart (scsi reset).
> May 14 13:27:58 test kernel: sym53c875E-0: Downloading SCSI SCRIPTS.
> May 14 13:28:01 test kernel: sym53c875E-0-<4,*>: FAST-20 WIDE SCSI 40.0
> MB/s (50 ns, offset 15)
>
>
>
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>
Robert Johannes
Systems Administrator
Kairos-Damango Internet Services Inc.
1300 Godward Street suite 3200
Minneapolis, MN 55413
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