[dm-devel] scsi errors

[Yann.Dupont]

Arthur Bergman wrote:

> Ok,
>
> Recompiled the kernel module and rebooted.
>
> First thing that happened is this.
>
> device-mapper: dm-round-robin version 0.2.1 loaded
> scsi(0:0:0) UNDERRUN status detected 0x15-0x800.
> scsi(0:0:0) UNDERRUN status detected 0x15-0x800.
> scsi(0:0:0) UNDERRUN status detected 0x15-0x800.
> scsi(0:0:1) UNDERRUN status detected 0x15-0x800.
> scsi(0:0:1) UNDERRUN status detected 0x15-0x800.
> scsi(0:0:1) UNDERRUN status detected 0x15-0x800.
> scsi(0:1:0) UNDERRUN status detected 0x15-0x800.
> scsi(0:1:0) UNDERRUN status detected 0x15-0x800.
> scsi(0:1:0) UNDERRUN status detected 0x15-0x800.
> scsi(0:1:1) UNDERRUN status detected 0x15-0x800.
> scsi(0:1:1) UNDERRUN status detected 0x15-0x800.
> scsi(0:1:1) UNDERRUN status detected 0x15-0x800.
> scsi(0:2:0) UNDERRUN status detected 0x15-0x800.
> scsi(0:2:0) UNDERRUN status detected 0x15-0x800.
> scsi(0:2:0) UNDERRUN status detected 0x15-0x800.
> scsi(0:2:1) UNDERRUN status detected 0x15-0x800.
> scsi(0:2:1) UNDERRUN status detected 0x15-0x800.
> scsi(0:2:1) UNDERRUN status detected 0x15-0x800.
> scsi(0:3:0) UNDERRUN status detected 0x15-0x800.
> scsi(0:3:0) UNDERRUN status detected 0x15-0x800.
> scsi(0:3:0) UNDERRUN status detected 0x15-0x800.
> scsi(0:3:1) UNDERRUN status detected 0x15-0x800.
> scsi(0:3:1) UNDERRUN status detected 0x15-0x800.
> scsi(0:3:1) UNDERRUN status detected 0x15-0x800.
> scsi(1:0:0) UNDERRUN status detected 0x15-0x800.
> scsi(1:0:0) UNDERRUN status detected 0x15-0x800.
> scsi(1:0:0) UNDERRUN status detected 0x15-0x800.
> scsi(1:0:1) UNDERRUN status detected 0x15-0x800.
> scsi(1:0:1) UNDERRUN status detected 0x15-0x800.
> scsi(1:0:1) UNDERRUN status detected 0x15-0x800.
> scsi(1:1:0) UNDERRUN status detected 0x15-0x800.
> scsi(1:1:0) UNDERRUN status detected 0x15-0x800.
> scsi(1:1:0) UNDERRUN status detected 0x15-0x800.
> scsi(1:1:1) UNDERRUN status detected 0x15-0x800.
> scsi(1:1:1) UNDERRUN status detected 0x15-0x800.
> scsi(1:1:1) UNDERRUN status detected 0x15-0x800.
> scsi(1:2:0) UNDERRUN status detected 0x15-0x800.
> scsi(1:2:0) UNDERRUN status detected 0x15-0x800.
> scsi(1:2:0) UNDERRUN status detected 0x15-0x800.
> scsi(1:2:1) UNDERRUN status detected 0x15-0x800.
> scsi(1:2:1) UNDERRUN status detected 0x15-0x800.
> scsi(1:2:1) UNDERRUN status detected 0x15-0x800.
> scsi(1:3:0) UNDERRUN status detected 0x15-0x800.
> scsi(1:3:0) UNDERRUN status detected 0x15-0x800.
> scsi(1:3:0) UNDERRUN status detected 0x15-0x800.
> scsi(1:3:1) UNDERRUN status detected 0x15-0x800.
> scsi(1:3:1) UNDERRUN status detected 0x15-0x800.
> scsi(1:3:1) UNDERRUN status detected 0x15-0x800.
>
>
> This is the 8.00.00b21-k" driver that came with 2.6.10-rc1
>
> Do I need to worry?


I don't think so, I have this at every boot.
(using debug enabled qla drivers)

This summer, I had lots of underrun & scsi errors, like you see.
It was rather variable (after 1 day ou 1 week), often when a bust of 
transfer was happening.
After 1 month of debug with andrew vasquez (qlogic engineer),
and after having suspected raid firmware, qlogic driver, and even dm code,

it turns to be a card wich had problems with his laser AND an sfp wich 
had problems
on 1 of my raid channel.

So beware of the physical part. Those opticals parts seems rather sensitive.

This was with multipath off.

Maybe you have problem on 1 of yours paths ??

-- 
Yann Dupont, Cri de l'université de Nantes
Tel: 02.51.12.53.91 - Fax: 02.51.12.58.60 - Yann.Dupont at univ-nantes.fr