Mauro Ziliani wrote: > Dec 11 00:47:27 mercurio kernel: ata1.00: exception Emask 0x0 SAct 0x0 > SErr 0x280000 action 0x0 > Dec 11 00:47:27 mercurio kernel: ata1.00: (BMDMA stat 0x60) > Dec 11 00:47:27 mercurio kernel: ata1.00: tag 0 cmd 0x25 Emask 0x1 stat > 0x51 err 0x4 (device error) > Dec 11 00:47:27 mercurio kernel: ata1: EH complete What's the kernel version? Your drive is reporting errors on reads and writes. > Why this happens? Possibly dying device. > I control the disk with PowerMax 4.23 and the disk works fine. > All test are ok. I dunno what PowerMax tests for. Can you please the result of 'smartctl -d ata -a /dev/sdX'? > Is it better to make the RAID1 throught Sill3114 BIOS or throught > software md? Doesn't really matter. All are software raid anyway. If you wanna use BIOS raid, you gotta setup dm raid which goes along with it. -- tejun - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html