Доброго времени суток.

При тестировании soft-RAID 5 на 4-х жестких дисках SATA ST3750640AS в 
логи часто сыпется:
Oct  2 11:07:24 localhost kernel: ata2.00: exception Emask 0x0 SAct 0x0 
SErr 0x0 action 0x0
Oct  2 11:07:24 localhost kernel: ata2.00: (irq_stat 0x40000001)
Oct  2 11:07:24 localhost kernel: ata2.00: tag 0 cmd 0xea Emask 0x1 stat 
0x61 err 0x4 (device error)
Oct  2 11:07:24 localhost kernel: ata2: EH complete
Oct  2 11:07:24 localhost kernel: SCSI device sdf: 1465149168 512-byte 
hdwr sectors (750156 MB)
Oct  2 11:07:24 localhost kernel: sdf: Write Protect is off
Oct  2 11:07:24 localhost kernel: SCSI device sdf: drive cache: write back
Oct  2 11:09:36 localhost kernel: ata2.00: exception Emask 0x0 SAct 0x0 
SErr 0x0 action 0x0
Oct  2 11:09:36 localhost kernel: ata2.00: (irq_stat 0x40000001)
Oct  2 11:09:36 localhost kernel: ata2.00: tag 0 cmd 0xea Emask 0x1 stat 
0x61 err 0x4 (device error)
Oct  2 11:09:41 localhost kernel: ata2: EH complete
Oct  2 11:09:41 localhost kernel: SCSI device sdf: 1465149168 512-byte 
hdwr sectors (750156 MB)
Oct  2 11:09:41 localhost kernel: sdf: Write Protect is off
Oct  2 11:09:41 localhost kernel: SCSI device sdf: drive cache: write back

Вопрос: На сколько это критично, и что это значит (помимо проблем с 1 из 
дисков)?

О конфигурации:
Контроллер 00:1f.2 SATA controller: Intel Corporation 631xESB/632xESB 
SATA Storage Controller AHCI (rev 09)
Ядро 2.6.18-std-smp-alt12.M40.3

/dev/md0:
Version : 00.90.03
Creation Time : Tue Sep 30 10:39:13 2008
Raid Level : raid5
Array Size : 2197715712 (2095.91 GiB 2250.46 GB)
Used Dev Size : 732571904 (698.64 GiB 750.15 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Thu Oct  2 11:28:08 2008
State : active
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
UUID : ff9d3992:fc427bd1:d4f6d241:21fdc934
Events : 0.3
    Number   Major   Minor   RaidDevice State
       0       8       81        0      active sync   /dev/sdf1
       1       8       97        1      active sync   /dev/sdg1
       2       8      113        2      active sync   /dev/sdh1
       3       8      129        3      active sync   /dev/sdi1


Тестирование сейчас идёт вот такое:
bonnie -s 2047 -v 80 -m store