In the last episode (Feb 26), Anthony Atkielski said:
> I get constant streams of messages concerning my disks on the console
> whenever I have a lot of disk activity on my system (2x SCSI disks,
> no IDE or other disks). I'd very much like to know what's going on
> (there's nothing wrong with the hardware, so either it's a
> configuration problem, or it's a bug).
>
> There doesn't seem to be any data loss or corruption occurring. I've
> had one or two panics, though (which may or may not have caused data
> loss--it's hard to tell).
>
> While recompiling the kernel, the system stalled periodically (at least
> anything involving disk I/O stalled) and generated several hundred
> kilobytes of messages looking like this:
>
> Feb 26 20:09:23 contactdish kernel: (da0:ahc0:0:0:0): Queue Full
> Feb 26 20:09:23 contactdish kernel: (da0:ahc0:0:0:0): tagged openings now 64
> Feb 26 20:09:23 contactdish kernel: (da0:ahc0:0:0:0): Retrying Command
Try lowering the max tags for that drive: "camcontrol tags da0 -N 32".
If that works, you can stick it in rc.local, or add an entry to the
xpt_quirk_table[] in /sys/cam/cam_xpt.c . It probably needs something
similar to the quantum quirk lines.
> In addition, I sometimes get bursts of much longer messages, looking
> something like this:
>
> Feb 25 20:09:29 contactdish kernel: ahc0: Recovery Initiated
> Feb 25 20:09:29 contactdish kernel: >>>>>>>>>>>>>>>>>> Dump Card State Begins
> <<<<<<<<<<<<<<<<<
> Feb 25 20:09:29 contactdish kernel: <<<<<<<<<<<<<<<<< Dump Card State Ends
> >>>>>>>>>>>>>>>>>>
> Feb 25 20:09:29 contactdish kernel: (da1:ahc0:0:2:0): SCB 0x49 - timed out
> Feb 25 20:09:29 contactdish kernel: sg[0] - Addr 0x1309b000 : Length 2048
> Feb 25 20:09:29 contactdish kernel: (da1:ahc0:0:2:0): Queuing a BDR SCB
> Feb 25 20:09:29 contactdish kernel: ahc0: Timedout SCBs already complete.
> Interrupts may not be functioning.
I never know what to look for in this output, but most of the time, I
think it's a cabling or termination problem. Reseat all the plugs :)
--
Dan Nelson
[EMAIL PROTECTED]
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