i/o errors on SCSI-drive - please help

[Alex Friis <alexfriis mobilixnet dk>]

Hi there!
A complety Linux-newbe I am.
I'm running 
Red Hat Linux release 6.1 (Cartman)
Kernel 2.2.12-20 on an i686
I did the starndard server install path.

On the console (?) I now and then get:

> scsi MEDIUM error on channel 0 id 0 lun0 CDB...........
> i/o error dev 08:05 sector 557328
> Additional sense indicates unrecovered read error recommend
> reassignment.

I've been searching for a log somewhere to hold messages like above.
But I can't find it - if it's really there!

'Reassignment' - what does that mean - do I have to reformat my HD or
what ?

This is how my sda's looks:

>Filesystem           1k-blocks      Used Available Use% Mounted on
> /dev/sda8               256667     29732    213683  12% /
> /dev/sda1                23302      2711     19388  12% /boot
> /dev/sda6              1786760    816072    879924  48% /home
> /dev/sda5              1786760    357520   1338476  21% /usr
> /dev/sda7               256667      6650    236765   3% /var

I got two SCSI harddrives, 2GB each, in the box. How can I know how many
lun's I've got? And how can I know the mapping of the sda's and the
luns?
Need badly some guidance regarding usefull utilities etc.
-- 

med venlig hilsen/best regards
Alex Friis
mailto:alexfriis mobilixnet dk