Re: "aborting sbp2 command"

On 1 Nov, John L. Clark wrote:
> On Sat, Nov 01, 2003 at 12:17:16PM +0100, Frank Louwers wrote:
>> I had the same problems with an external Maxtor HD. I solved all of my
>> problems by adding sbp2_max_speed=1 as a parameter to modprobe sbp2.

I would not call it a solution. It is actually a slow-down in the
hope that the error condition would not come up at reduced speed.

In my opinion, the situation with Frank's setup may have one of
these reasons:
- too much noise at the bus, caused by a bad host adapter card, a
  bad host system, bad cabling, or a bad drive case;
- an unknown bug in sbp2 or ieee1394 or scsi, e.g. with respect
  to special timing conditions.

> Unfortunately, it does not seem to have been effective. [...]
> I'm getting the same read errors, and, strangely
> enough, they're coming every thirty seconds (at least as accounted for
> in the log):
>
> Nov 1 09:51:03 host kernel: ieee1394: sbp2: aborting sbp2 command
> Nov 1 09:51:03 host kernel: Read (10) 00 13 ca e8 8d 00 00 fc 00

I read your first post again. What comes to my mind as possible
explanations is:
- an unknown bug, perhaps uncovered by shared interrupts;
- too much noise;
- too high temperature around the harddisk drive.

Let me say this: I suspect if somebody would go through the
mailinglist archive and would make statistics about reports of
read/write problems with sbp2, we would see more of them during
April to September, given that most SBP-2 harddisks are in use at
the northern hemisphere. Most of the HDD enclosures have a
problematic thermal design. Do not think the drive is
appropriately cooled if the drive case comes with one of those
noise-making tiny fans. How could these ensure an evenly air flow
in a typical 3.5" drive case without leaving some hot spots? I
have seen for myself that inner air temperature must stay
10...15 Kelvin below the operating environmental temperature
specified by the harddisk manufacturer, else r/w errors may pop
up. Additionaly, air flow has to be rather ample than modest if
we talk about 7200 RPM drives.

-- 
Stefan Richter
-=====-=--== =-== ----=
http://arcgraph.de/sr/
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