Hi, apologies in advance for the long email due to the log below. This is the second time I've run a consistency check on the RAID (6 HDDs, RAID5) that this error has occured. If you look on the ata3 entries in the log below: dmesg: ata1: SATA max UDMA/133 abar m8192@0xfae76000 port 0xfae76100 irq 40 ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300) ata1.00: ATA-8: Corsair CSSD-F60GB2, 1.1, max UDMA/133 ata1.00: 117231408 sectors, multi 1: LBA48 NCQ (depth 31/32) ata1.00: configured for UDMA/133 ata2: SATA max UDMA/133 abar m8192@0xfae76000 port 0xfae76180 irq 40 ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300) ata2.00: ATA-8: WDC WD20EARS-00MVWB0, 51.0AB51, max UDMA/133 ata2.00: 3907029168 sectors, multi 0: LBA48 NCQ (depth 31/32) ata2.00: configured for UDMA/133 ata3: SATA max UDMA/133 abar m8192@0xfae76000 port 0xfae76200 irq 40 ata3: SATA link up 3.0 Gbps (SStatus 123 SControl 300) ata3.00: ATA-8: WDC WD20EARS-00MVWB0, 50.0AB50, max UDMA/133 ata3.00: 3907029168 sectors, multi 0: LBA48 NCQ (depth 31/32) ata3.00: configured for UDMA/133 ata3.00: exception Emask 0x0 SAct 0x800801 SErr 0x0 action 0x6 frozen ata3.00: failed command: READ FPDMA QUEUED ata3.00: cmd 60/b0:00:50:31:7b/02:00:8b:00:00/40 tag 0 ncq 352256 in ata3.00: status: { DRDY } ata3.00: failed command: READ FPDMA QUEUED ata3.00: cmd 60/00:58:50:29:7b/04:00:8b:00:00/40 tag 11 ncq 524288 in ata3.00: status: { DRDY } ata3.00: failed command: READ FPDMA QUEUED ata3.00: cmd 60/00:b8:50:2d:7b/04:00:8b:00:00/40 tag 23 ncq 524288 in ata3.00: status: { DRDY } ata3: hard resetting link ata3: SATA link up 3.0 Gbps (SStatus 123 SControl 300) ata3.00: configured for UDMA/133 ata3.00: device reported invalid CHS sector 0 ata3.00: device reported invalid CHS sector 0 ata3.00: device reported invalid CHS sector 0 ata3: EH complete ata4: SATA max UDMA/133 abar m8192@0xfae76000 port 0xfae76280 irq 40 ata4: SATA link up 3.0 Gbps (SStatus 123 SControl 300) ata4.00: ATA-8: WDC WD20EARS-00MVWB0, 50.0AB50, max UDMA/133 ata4.00: 3907029168 sectors, multi 0: LBA48 NCQ (depth 31/32) ata4.00: configured for UDMA/133 ata5: SATA max UDMA/133 abar m8192@0xfae76000 port 0xfae76300 irq 40 ata5: SATA link down (SStatus 0 SControl 300) ata6: SATA max UDMA/133 abar m8192@0xfae76000 port 0xfae76380 irq 40 ata6: SATA link down (SStatus 0 SControl 300) ata7: SATA max UDMA/133 mmio m1048576@0xfeb00000 port 0xfeb22000 irq 19 ata7: SATA link down (SStatus 0 SControl 300) ata8: SATA max UDMA/133 mmio m1048576@0xfeb00000 port 0xfeb24000 irq 19 ata8: SATA link up 3.0 Gbps (SStatus 123 SControl 300) ata8.00: ATA-8: SAMSUNG HD204UI, 1AQ10003, max UDMA/133 ata8.00: 3907029168 sectors, multi 0: LBA48 NCQ (depth 31/32) ata8.00: configured for UDMA/133 ata9: SATA max UDMA/133 mmio m1048576@0xfeb00000 port 0xfeb26000 irq 19 ata9: SATA link up 3.0 Gbps (SStatus 123 SControl 300) ata9.00: ATA-8: WDC WD20EARS-00MVWB0, 51.0AB51, max UDMA/133 ata9.00: 3907029168 sectors, multi 0: LBA48 NCQ (depth 31/32) ata9.00: configured for UDMA/133 ata10: SATA max UDMA/133 mmio m1048576@0xfeb00000 port 0xfeb28000 irq 19 ata10: SATA link up 3.0 Gbps (SStatus 123 SControl 300) ata10.00: ATA-8: SAMSUNG HD204UI, 1AQ10003, max UDMA/133 ata10.00: 3907029168 sectors, multi 0: LBA48 NCQ (depth 31/32) ata10.00: configured for UDMA/133 hdparm -I /dev/sdc: ATA device, with non-removable media Model Number: WDC WD20EARS-00MVWB0 Serial Number: WD-WMAZ20152590 Firmware Revision: 50.0AB50 What I wonder is, how do I know what device is ata3? I do have 4 devices of that model (WD20EARS). I've tried searching in /sys but there's nothing of value there (or I've missed it). If dmesg only showed the S/N... I posted the smartctl --all output of all devices here in case someone has time to take a look: http://stuff.dyndns.org/logs/smart-sd[a,b,c,d,e,f,g].log Thanks, // Mathias -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html