Hello,

I was able to solve this issue on my configuration so I hope this will help somebody. Recently I have migrated my CentOS 6.3 server from Intel based  motherboard Gigabyte GA-P55-UD3L (rev. 1.0) to AMD based motherboard MSI 790FX-GD70. The only change in the system was the motherboard, cpu and memory, the rest of the configuration stayed the same. Immediately after migration I have started experiencing this exact issue

During boot I was getting errors

Nov 17 23:41:12 storage kernel: ata6.00: qc timeout (cmd 0xec)
Nov 17 23:41:12 storage kernel: ata6.00: failed to IDENTIFY (I/O error, err_mask=0x5)
Nov 17 23:41:12 storage kernel: ata6.00: revalidation failed (errno=-5)
Nov 17 23:41:12 storage kernel: ata6: hard resetting link
Nov 17 23:41:13 storage kernel: ata6: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
Nov 17 23:41:13 storage kernel: ata6.00: configured for UDMA/133
Nov 17 23:41:13 storage kernel: sd 5:0:0:0: [sdb] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Nov 17 23:41:13 storage kernel: sd 5:0:0:0: [sdb] Sense Key : Aborted Command [current] [descriptor]
Nov 17 23:41:13 storage kernel: Descriptor sense data with sense descriptors (in hex):
Nov 17 23:41:13 storage kernel:        72 0b 00 00 00 00 00 0c 00 0a 80 00 00 00 00 00 
Nov 17 23:41:13 storage kernel:        91 40 16 4e 
Nov 17 23:41:13 storage kernel: sd 5:0:0:0: [sdb] Add. Sense: No additional sense information
Nov 17 23:41:13 storage kernel: sd 5:0:0:0: [sdb] CDB: Read(10): 28 00 91 40 1b 4f 00 00 c0 00
Nov 17 23:41:13 storage kernel: ata6: EH complete
N

After boot this error transformed to

Nov 17 21:05:26 storage kernel: ata6.00: qc timeout (cmd 0xec)
Nov 17 21:05:26 storage kernel: ata6.00: failed to IDENTIFY (I/O error, err_mask=0x4)
Nov 17 21:05:26 storage kernel: ata6.00: revalidation failed (errno=-5)
Nov 17 21:05:26 storage kernel: ata6: hard resetting link
Nov 17 21:05:27 storage kernel: ata6: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
Nov 17 21:05:27 storage kernel: ata6.00: configured for UDMA/33
Nov 17 21:05:27 storage kernel: ata6: EH complete
Nov 17 21:06:26 storage kernel: ata6.00: exception Emask 0x50 SAct 0x1 SErr 0x280900 action 0x6 frozen
Nov 17 21:06:26 storage kernel: ata6.00: irq_stat 0x08000000, interface fatal error
Nov 17 21:06:26 storage kernel: ata6: SError: { UnrecovData HostInt 10B8B BadCRC }
Nov 17 21:06:26 storage kernel: ata6.00: failed command: READ FPDMA QUEUED
Nov 17 21:06:26 storage kernel: ata6.00: cmd 60/30:00:3f:9b:cc/00:00:8e:00:00/40 tag 0 ncq 24576 in
Nov 17 21:06:26 storage kernel:         res 40/00:00:3f:9b:cc/00:00:8e:00:00/40 Emask 0x50 (ATA bus error)
Nov 17 21:06:26 storage kernel: ata6.00: status: { DRDY }
Nov 17 21:06:26 storage kernel: ata6: hard resetting link
Nov 17 21:06:31 storage kernel: ata6: SATA link up 1.5 Gbps (SStatus 113 SControl 310)

In case it matters, these are the disks used in the system
Nov 17 23:53:58 storage kernel: ata6.00: ATA-8: ST31500341AS, SD1B, max UDMA/133
Nov 17 23:53:58 storage kernel: ata5.00: ATA-8: WDC WD20EADS-00S2B0, 01.00A01, max UDMA/133
Nov 17 23:53:58 storage kernel: ata7.00: ATA-6: ST380011A, 3.16, max UDMA/100
Nov 17 23:53:58 storage kernel: ata7.01: ATA-6: ST380011A, 3.16, max UDMA/100


I was able to completely eliminate this issue by
1. disabling NCQ
2. limiting the speed of SATA to 1.5GB

I have done so by modifying my /boot/grub/grub.conf and adding

 libata.force=noncq,1.5G

at the end of my kernel line. This bug also seems to be related or is duplicate of Bug 549981.