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sata disk failure?

Hello everybody,
I'm using an updated sid pure64 and I've got some troubles with my sata disks, but I'm not sure if the problem is in the hardware (in disks or maybe in the controller) or in the software... Maybe you can give me a good suggestion :-)

Sometimes disk I/O stops and I'm just able to go to a tty and see something like this:

ata2: command 0x35 timeout, stat 0xd0 host_stat 0x21
ata2: status=0xd0 { Busy }
SCSI error : <1 0 0 0> return code = 0x8000002
EOM ILI Current sda: sense = 70 7e
ASC= 4 ASCQ=a0
end_request: I/O error, dev sda, sector 215674327
ATA: abnormal status 0xD0 on port 0x977
ATA: abnormal status 0xD0 on port 0x977
ATA: abnormal status 0xD0 on port 0x977

My partition table is the following:

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1         729     5855661   83  Linux
/dev/sda2             730         972     1951897+  82  Linux swap / Solaris
/dev/sda3             973        1689     5759302+  83  Linux
/dev/sda4            1690       19929   146512800   85  Linux extended
/dev/sda5            1690        7768    48829536   8e  Linux LVM
/dev/sda6            7769       13847    48829536   8e  Linux LVM
/dev/sda7           13848       19929    48853633+  8e  Linux LVM

Often it seems that the error begin when I'm reading some data from the LVM part of the disk: I've got an Ubuntu on sda3 and it never crashed (but I've never tried to access my LVM partitions from Ubuntu)

Actually I'm using just one of my two sata disks, but if I use the other disk I've got similar errors on THAT disk, so I don't really think it's a disk failure (I've also tried badblocks, but the disks look good)... maybe a controller (nforce3-250) one?

I've read some pages on the Internet pointing to software errors...

The first time I saw that error I was playing with raid (mdadm): I had a nice RAID-1 between sda and sdb, now I'm not using raid.

So... any suggestion? :-)

Thanks a lot!

"È ricercando l'impossibile che l'uomo ha sempre realizzato il
possibile. Coloro che si sono saggiamente limitati a ciò che appariva
loro come possibile, non hanno mai avanzato di un solo passo."
Michail Bakunin (1814 - 1876)

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