Many SCSI errors

[Todd Denniston]

"Petriz, Pablo" wrote:
> 
> That 3rd disk was changed. Now it's running ok on another box.
> But that problem was solved with a entirely new Promise tower
> now with 1.1.0.30 firmware.
> 
> Since your last mail i've been testing the tower in many ways.
> I've connected the tower to a and old PC running webpam to log
> the possible errors, but it doesn´t detect this transmission
> error. On most hangs the tower seems to be working ok, we have
> to reboot the host, only one time we have to reboot both to
> reconnect.
> 
> The tests:
> 
> 1)We tried slowering the speed of the SCSI bus (from 320 to 20!)
>   then run badblocks against the entire RAID5 of 6 disks but it
>   fails and generates the same "Transmission error detected".
> 
> 2) We configure the tower like JBOD and then run badblocks for
>    every single HD (from 1 to 6). It runs ok on 1,2,3 and 4 HD
>    then it generates the Transmission error with HD5. We have to
>    reboot the host and the tower. Then run it again and its OK,
>    over HD6 ok too (but suffering hangs with the same messages).
Was it OK, or did it hang???
the reboot being needed at all on the tower suggests to me the firmware was in
a pinch.

>    So the conclusion is that the HD are ok, the problem is ...
>    Transmission (cable, SCSIcards, terminators) or software:
>    SCSI driver / firmware tower firmware.
> 
> 3) We change SCSI cable. Test again using badblocks but same
>    error happens "transmision error detected" and out.
 <SNIP> 
When you get the "transmision error detected", what (if anything) does the
rm8000 show when you do the `lv` command over the serial cable?

-- 
Todd Denniston
Crane Division, Naval Surface Warfare Center (NSWC Crane) 
Harnessing the Power of Technology for the Warfighter