The following erros occur with the live demo of the desktop install CD of 11.04 
natty:
kernel: 2.6.38-8-generic x86_64

[  876.391515] md/raid:md3: device sde operational as raid disk 2
[  876.391520] md/raid:md3: device sdb operational as raid disk 1
[  876.391525] md/raid:md3: device sda operational as raid disk 0
[  876.393557] md/raid:md3: allocated 8490kB
[  876.393650] md/raid:md3: raid level 6 active with 6 out of 8 devices, 
algorithm 2
[  876.393789] RAID conf printout:
[  876.393794]  --- level:6 rd:8 wd:6
[  876.393800]  disk 0, o:1, dev:sda
[  876.393805]  disk 1, o:1, dev:sdb
[  876.393809]  disk 2, o:1, dev:sde
[  876.393813]  disk 3, o:1, dev:sdf
[  876.393817]  disk 4, o:1, dev:sdg
[  876.393821]  disk 5, o:1, dev:sdh
[  876.393925] md3: detected capacity change from 0 to 12002383626240
[  876.394872]  md3: unknown partition table
[ 1082.960084] ata2.00: exception Emask 0x0 SAct 0x3f SErr 0x0 action 0x6 frozen
[ 1082.960095] ata2.00: failed command: WRITE FPDMA QUEUED
[ 1082.960111] ata2.00: cmd 61/a0:00:b0:08:0a/02:00:09:00:00/40 tag 0 ncq 
344064 out
[ 1082.960114]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 
(timeout)
[ 1082.960122] ata2.00: status: { DRDY }
[ 1082.960128] ata2.00: failed command: WRITE FPDMA QUEUED
[ 1082.960140] ata2.00: cmd 61/08:08:f0:0b:0a/00:00:09:00:00/40 tag 1 ncq 4096 
out
[ 1082.960143]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 
(timeout)
[ 1082.960150] ata2.00: status: { DRDY }
[ 1082.960155] ata2.00: failed command: WRITE FPDMA QUEUED
[ 1082.960168] ata2.00: cmd 61/40:10:00:5c:09/00:00:09:00:00/40 tag 2 ncq 32768 
out
[ 1082.960171]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 
(timeout)
[ 1082.960177] ata2.00: status: { DRDY }
[ 1082.960182] ata2.00: failed command: WRITE FPDMA QUEUED
[ 1082.960194] ata2.00: cmd 61/10:18:40:5c:09/00:00:09:00:00/40 tag 3 ncq 8192 
out
[ 1082.960197]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 
(timeout)
[ 1082.960203] ata2.00: status: { DRDY }
[ 1082.960209] ata2.00: failed command: WRITE FPDMA QUEUED
[ 1082.960221] ata2.00: cmd 61/a8:20:50:5c:09/03:00:09:00:00/40 tag 4 ncq 
479232 out
[ 1082.960223]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 
(timeout)
[ 1082.960230] ata2.00: status: { DRDY }
[ 1082.960235] ata2.00: failed command: WRITE FPDMA QUEUED
[ 1082.960247] ata2.00: cmd 61/08:28:f8:5f:09/00:00:09:00:00/40 tag 5 ncq 4096 
out
[ 1082.960250]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 
(timeout)
[ 1082.960256] ata2.00: status: { DRDY }
[ 1082.960265] ata2: hard resetting link
[ 1083.470120] ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[ 1083.550175] ata2.00: configured for UDMA/133
[ 1083.550190] ata2.00: device reported invalid CHS sector 0
[ 1083.550197] ata2.00: device reported invalid CHS sector 0
[ 1083.550203] ata2.00: device reported invalid CHS sector 0
[ 1083.550209] ata2.00: device reported invalid CHS sector 0
[ 1083.550217] ata2.00: device reported invalid CHS sector 0
[ 1083.550222] ata2.00: device reported invalid CHS sector 0
[ 1083.550246] ata2: EH complete

In the end the machine locked hard.

Next week I'll try the same with the SATA disks attached to an areca
SAS-HBA.

Regards

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https://bugs.launchpad.net/bugs/550559

Title:
  hdd problems, failed command: READ FPDMA QUEUED

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