I put the warning because a new pio task should not be queued while
another one is pending. Therefore, either sff_pio_task_link is NULL
[no task pending] or sff_pio_task_link is equal to the link of the
task [assumed to be the task in progress].
I must have missed something and did not cleanup sff_pio_task_link
properly in case of error...

Gwendal.

On Tue, Jul 12, 2011 at 7:29 AM, Tejun Heo [off-list ref] wrote:

Hello,

(cc'ing Gwendal Grignou and quoting whole message for him.)

That warning wasn't added by me.  It's from ea3c64506ea79 "libata-sff:
Reenable Port Multiplier after libata-sff remodeling."  Hmmm... I
never expected SFF to be used in combination with PMP.  Anyways,
Gwendal, any ideas?

On Wed, Jun 29, 2011 at 12:03:19PM -0400, Mark Lord wrote:

quoted

On 11-06-29 11:07 AM, Marc MERLIN wrote:

quoted

On Tue, Jun 28, 2011 at 10:03:41PM -0700, Marc MERLIN wrote:

quoted

On Tue, Jun 28, 2011 at 11:53:37PM -0400, Mark Lord wrote:

quoted

On 11-06-28 11:41 PM, Marc MERLIN wrote:
..

quoted

So it seems it was a false alarm after all, I'll report back if I have
problems again, but it looks like it's working solidly and for what it's
worth with 5 drives and software raid 5, I can both read and write files
at about 115MB/s, which isn't too shabby :)

Mmm.. power everything OFF, wait a few seconds,
then power on and verify that it all still works.

Yep, it does (even powered off the power supply to the MB that isn't truly
off otherwise).

Mmh, although the card works fine now, I did notice 3 libata-sff errors
in my boot log.
Once boot is finished, there are no more errors.

The card is:
02:00.0 SCSI storage controller: Marvell Technology Group Ltd. 88SX7042 PCI-e 4-port SATA-II (rev 02)

quoted

From the errors, should I try swapping the card considering it otherwise

works fine after boot, or is the problem elsewhere?
Can the 3 warnings just be ignored, or are they important?

So I suppose this is also why my kernel gets tainted?
kernel: Pid: 1636, comm: scsi_eh_9 Tainted: G        W   2.6.39.1-core2-volpreempt-noide-hm64-20110620 #2

kernel: sata_mv 0000:02:00.0: version 1.28
kernel: sata_mv 0000:02:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
kernel: sata_mv 0000:02:00.0: Gen-IIE 32 slots 4 ports SCSI mode IRQ via INTx
kernel: sata_mv 0000:02:00.0: setting latency timer to 64
kernel: scsi8 : sata_mv
kernel: scsi9 : sata_mv
kernel: scsi10 : sata_mv
kernel: scsi11 : sata_mv
kernel: ata9: SATA max UDMA/133 mmio m1048576@0xfb800000 port 0xfb822000 irq 16
kernel: ata10: SATA max UDMA/133 mmio m1048576@0xfb800000 port 0xfb824000 irq 16
kernel: ata11: SATA max UDMA/133 mmio m1048576@0xfb800000 port 0xfb826000 irq 16
kernel: ata12: SATA max UDMA/133 mmio m1048576@0xfb800000 port 0xfb828000 irq 16
kernel: ata9: SATA link down (SStatus 0 SControl 300)
kernel: ata10: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
kernel: ata10.15: Port Multiplier 1.1, 0x1095:0x3726 r23, 6 ports, feat 0x1/0x9
kernel: ata10.00: hard resetting link
kernel: ata10.01: hard resetting link
kernel: ata10.01: link resume succeeded after 1 retries
kernel: ata10.02: hard resetting link
kernel: ata10.02: link resume succeeded after 1 retries
kernel: ata10.03: hard resetting link
kernel: ata10.03: link resume succeeded after 1 retries
kernel: ata10.04: hard resetting link
kernel: ata10.05: hard resetting link
kernel: ata10.00: ATA-7: ST3500630AS, 3.AAK, max UDMA/133
kernel: ata10.00: 976773168 sectors, multi 0: LBA48 NCQ (depth 31/32)
kernel: ata10.00: configured for UDMA/133
kernel: ata10.01: qc timeout (cmd 0x27)
kernel: ata10.01: failed to read native max address (err_mask=0x4)
kernel: ata10.01: HPA support seems broken, skipping HPA handling
kernel: ata10.15: hard resetting link
kernel: ata10.15: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
kernel: ------------[ cut here ]------------
kernel: WARNING: at drivers/ata/libata-sff.c:1322 ata_sff_queue_pio_task+0x26/0x44()
kernel: Hardware name: System Product Name
kernel: Modules linked in: keyspan ati_remote visor pl2303 ftdi_sio pci_hotplug soundcore backlight option processor usb_wwan rtc_cmos thermal_sys rtc_core hwmon parport_pc button snd_page_alloc parport usbserial wmi i2c_i801 evdev rtc_lib sata_mv pcspkr intel_agp intel_gtt agpgart tpm_tis r8169 iTCO_wdt iTCO_vendor_support xhci_hcd ehci_hcd usbcore
kernel: Pid: 1636, comm: scsi_eh_9 Not tainted 2.6.39.1-core2-volpreempt-noide-hm64-20110620 #2
kernel: Call Trace:
kernel:  [<c0133599>] warn_slowpath_common+0x60/0x75
kernel:  [<c01335bd>] warn_slowpath_null+0xf/0x13
kernel:  [<c0370812>] ata_sff_queue_pio_task+0x26/0x44
kernel:  [<c0370946>] ata_sff_qc_issue+0x116/0x14d
kernel:  [<c03709d6>] ata_bmdma_qc_issue+0x59/0x156
kernel:  [<f844650b>] mv_qc_issue+0x441/0x44d [sata_mv]
kernel:  [<c028ea13>] ? vsnprintf+0x80/0x2d7
kernel:  [<c014b5bb>] ? up+0x2b/0x2f
kernel:  [<c036309d>] ata_qc_issue+0x30b/0x329
kernel:  [<c03638c2>] ata_exec_internal_sg+0x27f/0x4a0
kernel:  [<c036f84b>] ? ata_sff_tf_read+0x53/0xde
kernel:  [<c0363b41>] ata_exec_internal+0x5e/0x66
kernel:  [<c036a0a3>] ? ata_eh_done+0x12/0x18
kernel:  [<c037213a>] sata_pmp_read+0x66/0x9d
kernel:  [<c0372197>] sata_pmp_read_gscr+0x26/0x65
kernel:  [<c0371e77>] ? ata_sff_softreset+0x150/0x150
kernel:  [<c03727b8>] sata_pmp_error_handler+0x2ff/0xa42
kernel:  [<c01289e3>] ? dequeue_task_fair+0x1fc/0x204
kernel:  [<c03704f9>] ? ata_sff_drain_fifo+0x5a/0x5a
kernel:  [<f8445f41>] ? mv_port_start+0x19f/0x19f [sata_mv]
kernel:  [<f8445c50>] ? mv_pmp_hardreset+0x8c/0x8c [sata_mv]
kernel:  [<c0371e77>] ? ata_sff_softreset+0x150/0x150
kernel:  [<c044194d>] ? __mutex_lock_slowpath+0x1f2/0x1fa
kernel:  [<c013cadd>] ? lock_timer_base+0x1f/0x3e
kernel:  [<f8445bbf>] mv_pmp_error_handler+0x60/0x65 [sata_mv]
kernel:  [<c036e283>] ata_scsi_port_error_handler+0x206/0x522
kernel:  [<c01448f6>] ? cancel_delayed_work_sync+0xb/0xd
kernel:  [<c036e60c>] ata_scsi_error+0x6d/0x8f
kernel:  [<c032ad17>] ? scsi_eh_get_sense+0x16d/0x16d
kernel:  [<c032ae1a>] scsi_error_handler+0x103/0x507
kernel:  [<c012750b>] ? complete+0x34/0x3e
kernel:  [<c032ad17>] ? scsi_eh_get_sense+0x16d/0x16d
kernel:  [<c01476c0>] kthread+0x64/0x69
kernel:  [<c014765c>] ? kthread_worker_fn+0x119/0x119
kernel:  [<c0443bbe>] kernel_thread_helper+0x6/0xd
kernel: ---[ end trace cdcd2b0b3f6829ed ]---
kernel: ata10.00: hard resetting link
kernel: ata10.01: hard resetting link
kernel: ata10.01: link resume succeeded after 1 retries
kernel: ata10.02: hard resetting link
kernel: ata10.02: link resume succeeded after 1 retries
kernel: ata10.03: hard resetting link
kernel: ata10.03: link resume succeeded after 1 retries
kernel: ata10.04: hard resetting link
kernel: ata10.04: link resume succeeded after 1 retries
kernel: ata10.05: hard resetting link
kernel: ata10.00: configured for UDMA/133
kernel: ata10.01: ATA-7: ST3500630AS, 3.AAE, max UDMA/133
kernel: ata10.01: 976773168 sectors, multi 0: LBA48 NCQ (depth 31/32)
kernel: ata10.01: configured for UDMA/133
kernel: ata10.02: qc timeout (cmd 0x27)
kernel: ata10.02: failed to read native max address (err_mask=0x4)
kernel: ata10.02: HPA support seems broken, skipping HPA handling
kernel: ata10.15: hard resetting link
kernel: ata10.15: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
kernel: ------------[ cut here ]------------
kernel: WARNING: at drivers/ata/libata-sff.c:1322 ata_sff_queue_pio_task+0x26/0x44()
kernel: Hardware name: System Product Name
kernel: Modules linked in: keyspan ati_remote visor pl2303 ftdi_sio pci_hotplug soundcore backlight option processor usb_wwan rtc_cmos thermal_sys rtc_core hwmon parport_pc button snd_page_alloc parport usbserial wmi i2c_i801 evdev rtc_lib sata_mv pcspkr intel_agp intel_gtt agpgart tpm_tis r8169 iTCO_wdt iTCO_vendor_support xhci_hcd ehci_hcd usbcore
kernel: Pid: 1636, comm: scsi_eh_9 Tainted: G        W   2.6.39.1-core2-volpreempt-noide-hm64-20110620 #2
kernel: Call Trace:
kernel:  [<c0133599>] warn_slowpath_common+0x60/0x75
kernel:  [<c01335bd>] warn_slowpath_null+0xf/0x13
kernel:  [<c0370812>] ata_sff_queue_pio_task+0x26/0x44
kernel:  [<c0370946>] ata_sff_qc_issue+0x116/0x14d
kernel:  [<c03709d6>] ata_bmdma_qc_issue+0x59/0x156
kernel:  [<f844650b>] mv_qc_issue+0x441/0x44d [sata_mv]
kernel:  [<c028ea13>] ? vsnprintf+0x80/0x2d7
kernel:  [<c014b5bb>] ? up+0x2b/0x2f
kernel:  [<c036309d>] ata_qc_issue+0x30b/0x329
kernel:  [<c03638c2>] ata_exec_internal_sg+0x27f/0x4a0
kernel:  [<c036f84b>] ? ata_sff_tf_read+0x53/0xde
kernel:  [<c0363b41>] ata_exec_internal+0x5e/0x66
kernel:  [<c036a0a3>] ? ata_eh_done+0x12/0x18
kernel:  [<c037213a>] sata_pmp_read+0x66/0x9d
kernel:  [<c0372197>] sata_pmp_read_gscr+0x26/0x65
kernel:  [<c0371e77>] ? ata_sff_softreset+0x150/0x150
kernel:  [<c03727b8>] sata_pmp_error_handler+0x2ff/0xa42
kernel:  [<c01289e3>] ? dequeue_task_fair+0x1fc/0x204
kernel:  [<c03704f9>] ? ata_sff_drain_fifo+0x5a/0x5a
kernel:  [<f8445f41>] ? mv_port_start+0x19f/0x19f [sata_mv]
kernel:  [<f8445c50>] ? mv_pmp_hardreset+0x8c/0x8c [sata_mv]
kernel:  [<c0371e77>] ? ata_sff_softreset+0x150/0x150
kernel:  [<c044194d>] ? __mutex_lock_slowpath+0x1f2/0x1fa
kernel:  [<c013cadd>] ? lock_timer_base+0x1f/0x3e
kernel:  [<f8445bbf>] mv_pmp_error_handler+0x60/0x65 [sata_mv]
kernel:  [<c036e283>] ata_scsi_port_error_handler+0x206/0x522
kernel:  [<c01448f6>] ? cancel_delayed_work_sync+0xb/0xd
kernel:  [<c036e60c>] ata_scsi_error+0x6d/0x8f
kernel:  [<c032ad17>] ? scsi_eh_get_sense+0x16d/0x16d
kernel:  [<c032ae1a>] scsi_error_handler+0x103/0x507
kernel:  [<c012750b>] ? complete+0x34/0x3e
kernel:  [<c032ad17>] ? scsi_eh_get_sense+0x16d/0x16d
kernel:  [<c01476c0>] kthread+0x64/0x69
kernel:  [<c014765c>] ? kthread_worker_fn+0x119/0x119
kernel:  [<c0443bbe>] kernel_thread_helper+0x6/0xd
kernel: ---[ end trace cdcd2b0b3f6829ee ]---
kernel: ata10.00: hard resetting link
kernel: ata10.01: hard resetting link
kernel: ata10.01: link resume succeeded after 1 retries
kernel: ata10.02: hard resetting link
kernel: ata10.02: link resume succeeded after 1 retries
kernel: ata10.03: hard resetting link
kernel: ata10.03: link resume succeeded after 1 retries
kernel: ata10.04: hard resetting link
kernel: ata10.04: link resume succeeded after 1 retries
kernel: ata10.05: hard resetting link
kernel: ata10.00: configured for UDMA/133
kernel: ata10.01: configured for UDMA/133
kernel: ata10.02: ATA-7: ST3500630AS, 3.AAE, max UDMA/133
kernel: ata10.02: 976773168 sectors, multi 0: LBA48 NCQ (depth 31/32)
kernel: ata10.02: configured for UDMA/133
kernel: ata10.03: qc timeout (cmd 0x27)
kernel: ata10.03: failed to read native max address (err_mask=0x4)
kernel: ata10.03: HPA support seems broken, skipping HPA handling
kernel: ata10.15: hard resetting link
kernel: ata10.15: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
kernel: ------------[ cut here ]------------
kernel: WARNING: at drivers/ata/libata-sff.c:1322 ata_sff_queue_pio_task+0x26/0x44()
kernel: Hardware name: System Product Name
kernel: Modules linked in: keyspan ati_remote visor pl2303 ftdi_sio pci_hotplug soundcore backlight option processor usb_wwan rtc_cmos thermal_sys rtc_core hwmon parport_pc button snd_page_alloc parport usbserial wmi i2c_i801 evdev rtc_lib sata_mv pcspkr intel_agp intel_gtt agpgart tpm_tis r8169 iTCO_wdt iTCO_vendor_support xhci_hcd ehci_hcd usbcore
kernel: Pid: 1636, comm: scsi_eh_9 Tainted: G        W   2.6.39.1-core2-volpreempt-noide-hm64-20110620 #2
kernel: Call Trace:
kernel:  [<c0133599>] warn_slowpath_common+0x60/0x75
kernel:  [<c01335bd>] warn_slowpath_null+0xf/0x13
kernel:  [<c0370812>] ata_sff_queue_pio_task+0x26/0x44
kernel:  [<c0370946>] ata_sff_qc_issue+0x116/0x14d
kernel:  [<c03709d6>] ata_bmdma_qc_issue+0x59/0x156
kernel:  [<f844650b>] mv_qc_issue+0x441/0x44d [sata_mv]
kernel:  [<c028ea13>] ? vsnprintf+0x80/0x2d7
kernel:  [<c014b5bb>] ? up+0x2b/0x2f
kernel:  [<c036309d>] ata_qc_issue+0x30b/0x329
kernel:  [<c03638c2>] ata_exec_internal_sg+0x27f/0x4a0
kernel:  [<c036f84b>] ? ata_sff_tf_read+0x53/0xde
kernel:  [<c0363b41>] ata_exec_internal+0x5e/0x66
kernel:  [<c036a0a3>] ? ata_eh_done+0x12/0x18
kernel:  [<c037213a>] sata_pmp_read+0x66/0x9d
kernel:  [<c0372197>] sata_pmp_read_gscr+0x26/0x65
kernel:  [<c0371e77>] ? ata_sff_softreset+0x150/0x150
kernel:  [<c03727b8>] sata_pmp_error_handler+0x2ff/0xa42
kernel:  [<c01289e3>] ? dequeue_task_fair+0x1fc/0x204
kernel:  [<c03704f9>] ? ata_sff_drain_fifo+0x5a/0x5a
kernel:  [<f8445f41>] ? mv_port_start+0x19f/0x19f [sata_mv]
kernel:  [<f8445c50>] ? mv_pmp_hardreset+0x8c/0x8c [sata_mv]
kernel:  [<c0371e77>] ? ata_sff_softreset+0x150/0x150
kernel:  [<c044194d>] ? __mutex_lock_slowpath+0x1f2/0x1fa
kernel:  [<c013cadd>] ? lock_timer_base+0x1f/0x3e
kernel:  [<f8445bbf>] mv_pmp_error_handler+0x60/0x65 [sata_mv]
kernel:  [<c036e283>] ata_scsi_port_error_handler+0x206/0x522
kernel:  [<c01448f6>] ? cancel_delayed_work_sync+0xb/0xd
kernel:  [<c036e60c>] ata_scsi_error+0x6d/0x8f
kernel:  [<c032ad17>] ? scsi_eh_get_sense+0x16d/0x16d
kernel:  [<c032ae1a>] scsi_error_handler+0x103/0x507
kernel:  [<c012750b>] ? complete+0x34/0x3e
kernel:  [<c032ad17>] ? scsi_eh_get_sense+0x16d/0x16d
kernel:  [<c01476c0>] kthread+0x64/0x69
kernel:  [<c014765c>] ? kthread_worker_fn+0x119/0x119
kernel:  [<c0443bbe>] kernel_thread_helper+0x6/0xd
kernel: ---[ end trace cdcd2b0b3f6829ef ]---
kernel: ata10.00: hard resetting link
kernel: ata10.01: hard resetting link
kernel: ata10.01: link resume succeeded after 1 retries
kernel: ata10.02: hard resetting link
kernel: ata10.02: link resume succeeded after 1 retries
kernel: ata10.03: hard resetting link
kernel: ata10.03: link resume succeeded after 1 retries
kernel: ata10.04: hard resetting link
kernel: ata10.04: link resume succeeded after 1 retries
kernel: ata10.05: hard resetting link
kernel: ata10.00: configured for UDMA/133
kernel: ata10.01: configured for UDMA/133
kernel: ata10.02: configured for UDMA/133
kernel: ata10.03: ATA-7: ST3500630AS, 3.AAE, max UDMA/133
kernel: ata10.03: 976773168 sectors, multi 0: LBA48 NCQ (depth 31/32)
kernel: ata10.03: configured for UDMA/133
kernel: ata10.04: ATA-7: ST3750640AS, 3.AAK, max UDMA/133
kernel: ata10.04: 1465149168 sectors, multi 0: LBA48 NCQ (depth 31/32)
kernel: ata10.04: configured for UDMA/133
kernel: ata10: EH complete
kernel: scsi 9:0:0:0: Direct-Access     ATA      ST3500630AS      3.AA PQ: 0 ANSI: 5
kernel: sd 9:0:0:0: [sdc] 976773168 512-byte logical blocks: (500 GB/465 GiB)
kernel: sd 9:0:0:0: [sdc] Write Protect is off
kernel: sd 9:0:0:0: [sdc] Mode Sense: 00 3a 00 00
kernel: sd 9:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
kernel: scsi 9:1:0:0: Direct-Access     ATA      ST3500630AS      3.AA PQ: 0 ANSI: 5
kernel: sd 9:1:0:0: [sdd] 976773168 512-byte logical blocks: (500 GB/465 GiB)
kernel: sd 9:1:0:0: [sdd] Write Protect is off
kernel: sd 9:1:0:0: [sdd] Mode Sense: 00 3a 00 00
kernel: sd 9:1:0:0: [sdd] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
kernel: scsi 9:2:0:0: Direct-Access     ATA      ST3500630AS      3.AA PQ: 0 ANSI: 5
kernel: sd 9:2:0:0: [sde] 976773168 512-byte logical blocks: (500 GB/465 GiB)
kernel: sd 9:2:0:0: [sde] Write Protect is off
kernel: sd 9:2:0:0: [sde] Mode Sense: 00 3a 00 00
kernel: sd 9:2:0:0: [sde] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
kernel: scsi 9:3:0:0: Direct-Access     ATA      ST3500630AS      3.AA PQ: 0 ANSI: 5
kernel: sd 9:3:0:0: [sdf] 976773168 512-byte logical blocks: (500 GB/465 GiB)
kernel: sd 9:3:0:0: [sdf] Write Protect is off
kernel: sd 9:3:0:0: [sdf] Mode Sense: 00 3a 00 00
kernel: sd 9:3:0:0: [sdf] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
kernel: scsi 9:4:0:0: Direct-Access     ATA      ST3750640AS      3.AA PQ: 0 ANSI: 5
kernel: sd 9:4:0:0: [sdg] 1465149168 512-byte logical blocks: (750 GB/698 GiB)
kernel: sd 9:4:0:0: [sdg] Write Protect is off
kernel: sd 9:4:0:0: [sdg] Mode Sense: 00 3a 00 00
kernel: sd 9:4:0:0: [sdg] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
kernel:  sdc: sdc1
kernel: sd 9:0:0:0: [sdc] Attached SCSI disk
kernel:  sdg: sdg1 sdg2
kernel: sd 9:4:0:0: [sdg] Attached SCSI disk
kernel:  sdd: sdd1
kernel: sd 9:1:0:0: [sdd] Attached SCSI disk
kernel:  sde: sde1
kernel:  sdf: sdf1
kernel: sd 9:2:0:0: [sde] Attached SCSI disk
kernel: sd 9:3:0:0: [sdf] Attached SCSI disk
kernel: ata11: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
kernel: ata11.15: Port Multiplier 1.1, 0x1095:0x3726 r23, 6 ports, feat 0x1/0x9
kernel: ata11.00: hard resetting link
kernel: ata11.01: hard resetting link
kernel: ata11.02: hard resetting link
kernel: ata11.03: hard resetting link
kernel: ata11.04: hard resetting link
kernel: ata11.05: hard resetting link
kernel: ata11.00: ATA-8: WDC WD20EADS-00W4B0, 01.00A01, max UDMA/133
kernel: ata11.00: 3907029168 sectors, multi 0: LBA48 NCQ (depth 31/32)
kernel: ata11.00: configured for Uel kernel: ata11.02: ATA-8: WDC WD20EADS-00R6B0, 01.00A01, max UDMA/133
kernel: ata11.02: 3907029168 sectors, multi 0: LBA48 NCQ (depth 31/32)
kernel: ata11.02: configured for UDMA/133
kernel: ata11.03: ATA-8: WDC WD20EADS-00R6B0, 01.00A01, max UDMA/133
kernel: ata11.03: 3907029168 sectors, multi 0: LBA48 NCQ (depth 31/32)
kernel: ata11.03: configured for UDMA/133
kernel: ata11.04: ATA-8: WDC WD20EADS-00S2B0, 01.00A01, max UDMA/133
kernel: ata11.04: 3907029168 sectors, multi 0: LBA48 NCQ (depth 31/32)
kernel: ata11.04: configured for UDMA/133
kernel: ata11: EH complete
kernel: scsi 10:0:0:0: Direct-Access     ATA      WDC WD20EADS-00W 01.0 PQ: 0 ANSI: 5
kernel: sd 10:0:0:0: [sdh] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
kernel: sd 10:0:0:0: [sdh] Write Protect is off
kernel: sd 10:0:0:0: [sdh] Mode Sense: 00 3a 00 00
kernel: sd 10:0:0:0: [sdh] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
kernel: scsi 10:1:0:0: Direct-Access     ATA      WDC WD20EADS-00R 01.0 PQ: 0 ANSI: 5
kernel: sd 10:1:0:0: [sdi] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
kernel: sd 10:1:0:0: [sdi] Write Protect is off
kernel: sd 10:1:0:0: [sdi] Mode Sense: 00 3a 00 00
kernel: sd 10:1:0:0: [sdi] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
kernel: scsi 10:2:0:0: Direct-Access     ATA      WDC WD20EADS-00R 01.0 PQ: 0 ANSI: 5
kernel: sd 10:2:0:0: [sdj] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
kernel: sd 10:2:0:0: [sdj] Write Protect is off
kernel: sd 10:2:0:0: [sdj] Mode Sense: 00 3a 00 00
kernel: sd 10:2:0:0: [sdj] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
kernel: scsi 10:3:0:0: Direct-Access     ATA      WDC WD20EADS-00R 01.0 PQ: 0 ANSI: 5
kernel: sd 10:3:0:0: [sdk] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
kernel: sd 10:3:0:0: [sdk] Write Protect is off
kernel: sd 10:3:0:0: [sdk] Mode Sense: 00 3a 00 00
kernel: sd 10:3:0:0: [sdk] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
kernel: scsi 10:4:0:0: Direct-Access     ATA      WDC WD20EADS-00S 01.0 PQ: 0 ANSI: 5
kernel: sd 10:4:0:0: [sdl] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
kernel: sd 10:4:0:0: [sdl] Write Protect is off
kernel: sd 10:4:0:0: [sdl] Mode Sense: 00 3a 00 00
kernel: sd 10:4:0:0: [sdl] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
kernel:  sdi: sdi1
kernel: sd 10:1:0:0: [sdi] Attached SCSI disk
kernel:  sdk: sdk1
kernel: sd 10:3:0:0: [sdk] Attached SCSI disk
kernel:  sdl: sdl1
kernel: sd 10:4:0:0: [sdl] Attached SCSI disk
kernel:  sdj: sdj1
kernel: sd 10:2:0:0: [sdj] Attached SCSI disk
kernel: ata12: SATA link down (SStatus 0 SControl 300)
kernel:  sdh: sdh1
kernel: sd 10:0:0:0: [sdh] Attached SCSI disk

Those WARNINGS are probably harmless right now, so don't panic over them.
Not hardware related; more just alerting Tejun to a possible libata bug.

cheers
--
Mark Lord
Real-Time Remedies Inc.
mlord@pobox.com

--
tejun