With ubuntu daily (24-Jul-2014) mainline kernel build 3.16.0-999-generic two drives are detected: $ lsscsi [4:0:0:0] disk ATA OCZ-VERTEX 1.3 /dev/sda [7:0:0:0] disk ATA Hitachi HDS5C302 AAB0 /dev/sdb [8:0:0:0] disk ATA Hitachi HDS5C302 AAB0 /dev/sdc [12:0:0:0] process Marvell 91xx Config 1.01 - Dmesg: ... [ 0.895905] ata7: SATA link down (SStatus 0 SControl 300) [ 0.895968] ata13: SATA link up 1.5 Gbps (SStatus 113 SControl 300) [ 0.896027] ata10: SATA link down (SStatus 0 SControl 300) [ 0.896089] ata11: SATA link down (SStatus 0 SControl 300) [ 0.896149] ata9: SATA link down (SStatus 0 SControl 300) [ 0.896204] ata12: SATA link down (SStatus 0 SControl 300) [ 0.896262] ata8: SATA link down (SStatus 0 SControl 300) ... [ 0.965732] ata13.00: ATAPI: MARVELL VIRTUALL, 1.09, max UDMA/66 [ 0.965999] ata13.00: configured for UDMA/66 [ 1.007826] ata6: SATA link up 1.5 Gbps (SStatus 113 SControl 300) ... [ 1.944531] ata8: exception Emask 0x10 SAct 0x0 SErr 0x4000000 action 0xe frozen [ 1.944584] ata8: irq_stat 0x80000040, connection status changed [ 1.944621] ata8: SError: { DevExch } [ 1.944656] ata8: hard resetting link [ 2.446514] Switched to clocksource tsc [ 3.001875] ata8: SATA link up 1.5 Gbps (SStatus 113 SControl 300) [ 3.842582] ata9: exception Emask 0x10 SAct 0x0 SErr 0x4000000 action 0xe frozen [ 3.842635] ata9: irq_stat 0x80000040, connection status changed [ 3.842672] ata9: SError: { DevExch } [ 3.842706] ata9: hard resetting link [ 4.900025] ata9: SATA link up 1.5 Gbps (SStatus 113 SControl 300) [ 5.740635] ata10: exception Emask 0x10 SAct 0x0 SErr 0x4000000 action 0xe frozen [ 5.740688] ata10: irq_stat 0x80000040, connection status changed [ 5.740725] ata10: SError: { DevExch } [ 5.740759] ata10: hard resetting link [ 6.002940] ata6.00: qc timeout (cmd 0xef) [ 6.010934] ata6.00: failed to IDENTIFY (SPINUP failed, err_mask=0x4) [ 6.798176] ata10: SATA link up 1.5 Gbps (SStatus 113 SControl 300) [ 7.638679] ata11: exception Emask 0x10 SAct 0x0 SErr 0x4000000 action 0xe frozen [ 7.638733] ata11: irq_stat 0x80000040, connection status changed [ 7.638770] ata11: SError: { DevExch } [ 7.638804] ata11: hard resetting link [ 7.996996] ata8.00: qc timeout (cmd 0xec) [ 8.004992] ata8.00: failed to IDENTIFY (I/O error, err_mask=0x4) [ 8.005031] ata8: hard resetting link [ 8.240769] ata6: SATA link up 1.5 Gbps (SStatus 113 SControl 300) [ 8.332683] ata8: SATA link up 1.5 Gbps (SStatus 113 SControl 300) [ 8.360655] ata11: SATA link up 1.5 Gbps (SStatus 113 SControl 300) [ 13.327786] ata9.00: qc timeout (cmd 0xef) [ 13.327826] ata10.00: qc timeout (cmd 0xef) [ 13.331795] ata8.00: qc timeout (cmd 0xef) [ 13.335794] ata9.00: failed to IDENTIFY (SPINUP failed, err_mask=0x4) [ 13.335835] ata9: hard resetting link [ 13.335874] ata10.00: failed to IDENTIFY (SPINUP failed, err_mask=0x4) [ 13.335915] ata10: hard resetting link [ 13.339790] ata8.00: failed to IDENTIFY (SPINUP failed, err_mask=0x4) [ 13.339830] ata8: limiting SATA link speed to 1.5 Gbps [ 13.339866] ata8: hard resetting link [ 13.355772] ata11.00: qc timeout (cmd 0xec) [ 13.363767] ata11.00: failed to IDENTIFY (I/O error, err_mask=0x4) [ 13.363807] ata11: hard resetting link [ 15.677520] ata9: SATA link up 1.5 Gbps (SStatus 113 SControl 300) [ 15.677576] ata10: SATA link up 1.5 Gbps (SStatus 113 SControl 300) [ 15.737460] ata8: SATA link up 1.5 Gbps (SStatus 113 SControl 310) [ 15.817395] ata11: SATA link up 1.5 Gbps (SStatus 113 SControl 300) [ 25.763666] ata10.00: qc timeout (cmd 0xef) [ 25.763707] ata6.00: qc timeout (cmd 0xef) [ 25.771672] ata6.00: failed to enable AA (error_mask=0x4) [ 25.771711] ata6: limiting SATA link speed to 1.5 Gbps [ 25.771754] ata10.00: failed to IDENTIFY (SPINUP failed, err_mask=0x4) [ 25.771795] ata10: limiting SATA link speed to 1.5 Gbps [ 25.771831] ata10: hard resetting link [ 25.807635] ata11.00: qc timeout (cmd 0xec) [ 25.815629] ata11.00: failed to IDENTIFY (I/O error, err_mask=0x4) [ 25.815669] ata11: limiting SATA link speed to 1.5 Gbps [ 25.815705] ata11: hard resetting link [ 26.099369] ata6: SATA link up 1.5 Gbps (SStatus 113 SControl 310) [ 27.909583] ata9.00: qc timeout (cmd 0x27) [ 27.917580] ata9.00: failed to read native max address (err_mask=0x4) [ 27.917619] ata9.00: HPA support seems broken, skipping HPA handling [ 27.917658] ata9: limiting SATA link speed to 1.5 Gbps [ 27.917693] ata9: hard resetting link [ 30.127434] ata10: SATA link up 1.5 Gbps (SStatus 113 SControl 310) [ 30.171390] ata11: SATA link up 1.5 Gbps (SStatus 113 SControl 310) [ 30.203360] ata9: SATA link up 1.5 Gbps (SStatus 113 SControl 310) ... [ 35.214470] ata10.00: qc timeout (cmd 0x27) [ 35.214482] ata11.00: qc timeout (cmd 0xef) [ 35.214489] ata6.00: qc timeout (cmd 0x27) [ 35.222463] ata6.00: failed to read native max address (err_mask=0x4) [ 35.222465] ata6.00: HPA support seems broken, skipping HPA handling [ 35.222476] ata11.00: failed to IDENTIFY (SPINUP failed, err_mask=0x4) [ 35.222479] ata11: hard resetting link [ 35.222486] ata10.00: failed to read native max address (err_mask=0x4) [ 35.222487] ata10.00: HPA support seems broken, skipping HPA handling [ 35.222488] ata10: hard resetting link [ 37.508244] ata11: SATA link up 1.5 Gbps (SStatus 113 SControl 310) [ 37.516221] ata11: EH complete [ 37.564187] ata6: SATA link up 1.5 Gbps (SStatus 113 SControl 310) [ 37.605808] ata8.00: ATA-8: Hitachi HDS5C3020BLE630, MZ4OAAB0, max UDMA/133 [ 37.605811] ata8.00: 3907029168 sectors, multi 0: LBA48 NCQ (depth 31/32), AA [ 37.605941] ata9.00: ATA-8: Hitachi HDS5C3020BLE630, MZ4OAAB0, max UDMA/133 [ 37.605943] ata9.00: 3907029168 sectors, multi 0: LBA48 NCQ (depth 31/32), AA [ 37.608058] ata9.00: configured for UDMA/133 [ 37.608062] ata9: EH complete [ 37.608112] scsi 8:0:0:0: Direct-Access ATA Hitachi HDS5C302 AAB0 PQ: 0 ANSI: 5 [ 37.608167] ata8.00: configured for UDMA/133 [ 37.608170] ata8: EH complete [ 37.608204] scsi 7:0:0:0: Direct-Access ATA Hitachi HDS5C302 AAB0 PQ: 0 ANSI: 5 [ 37.609487] sd 7:0:0:0: [sdb] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB) [ 37.609490] sd 7:0:0:0: [sdb] 4096-byte physical blocks [ 37.609523] sd 7:0:0:0: [sdb] Write Protect is off [ 37.609525] sd 7:0:0:0: [sdb] Mode Sense: 00 3a 00 00 [ 37.609540] sd 8:0:0:0: [sdc] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB) [ 37.609541] sd 8:0:0:0: [sdc] 4096-byte physical blocks [ 37.609547] sd 7:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA [ 37.609624] sd 8:0:0:0: [sdc] Write Protect is off [ 37.609626] sd 8:0:0:0: [sdc] Mode Sense: 00 3a 00 00 [ 37.609635] sd 8:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA [ 37.609829] sd 7:0:0:0: Attached scsi generic sg1 type 0 [ 37.610487] sd 8:0:0:0: Attached scsi generic sg2 type 0 [ 37.610704] scsi 12:0:0:0: Processor Marvell 91xx Config 1.01 PQ: 0 ANSI: 5 [ 37.620101] ata10: SATA link up 1.5 Gbps (SStatus 113 SControl 310) [ 37.624091] ata13.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0 [ 37.624115] ata13.00: irq_stat 0x40000001 [ 37.624131] scsi 12:0:0:0: CDB: [ 37.624132] Inquiry: 12 01 00 00 ff 00 [ 37.624138] ata13.00: cmd a0/01:00:00:00:01/00:00:00:00:00/a0 tag 2 dma 16640 in [ 37.624138] res 50/00:00:00:00:00/00:00:00:00:00/00 Emask 0x1 (device error) [ 37.624181] ata13.00: status: { DRDY } [ 37.624344] scsi 12:0:0:0: Attached scsi generic sg3 type 3 [ 37.628091] ata10: EH complete [ 37.632385] random: nonblocking pool is initialized [ 37.652780] sdc: unknown partition table [ 37.652844] sdb: unknown partition table [ 37.652936] sd 8:0:0:0: [sdc] Attached SCSI disk [ 37.652963] sd 7:0:0:0: [sdb] Attached SCSI disk