array failure

Hi,

Can anyone help me better understand these messages? I'm trying to determine the cause of the failure, cable, hd, disk controller, etc? The below is what appears when I reset the disk array,

Dec 24 22:31:40 atlas kernel: [ 1485.045504] ata2: hard resetting link
Dec 24 22:31:42 atlas kernel: [ 1487.447432] ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
Dec 24 22:31:42 atlas kernel: [ 1487.699172] ata2.15: qc timeout (cmd 0xe8)
Dec 24 22:31:42 atlas kernel: [ 1487.722552] ata2: failed to recover some devices, retrying in 5 secs
Dec 24 22:31:47 atlas kernel: [ 1492.718316] ata2: hard resetting link
Dec 24 22:31:49 atlas kernel: [ 1494.916202] ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
Dec 24 22:31:50 atlas kernel: [ 1495.167944] ata2.15: qc timeout (cmd 0xe4)
Dec 24 22:31:50 atlas kernel: [ 1495.179404] ata2: failed to recover some devices, retrying in 5 secs
Dec 24 22:31:55 atlas kernel: [ 1500.175099] ata2: hard resetting link
Dec 24 22:31:57 atlas kernel: [ 1502.372985] ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
Dec 24 22:31:57 atlas kernel: [ 1502.624727] ata2.15: qc timeout (cmd 0xe4)
Dec 24 22:31:57 atlas kernel: [ 1502.639478] ata2: failed to recover some devices, retrying in 5 secs
Dec 24 22:32:02 atlas kernel: [ 1507.635876] ata2: hard resetting link
Dec 24 22:32:04 atlas kernel: [ 1509.833763] ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
Dec 24 22:32:04 atlas kernel: [ 1509.833798] ata2: EH complete

Thanks,
Matt

Below are some more messages that may be helpful in understanding the failure,

Dec 24 22:33:06 atlas kernel: [ 1571.338228] ata2: hard resetting link
Dec 24 22:33:16 atlas kernel: [ 1581.350164] ata2: hard resetting link
Dec 24 22:33:26 atlas kernel: [ 1591.358851] ata2: hard resetting link
Dec 24 22:33:28 atlas kernel: [ 1593.556721] ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
Dec 24 22:33:28 atlas kernel: [ 1593.557002] ata2.15: Port Multiplier 1.1, 0x1095:0x4726 r31, 7 ports, feat 0x1/0x9
Dec 24 22:33:28 atlas kernel: [ 1593.808467] ata2.15: qc timeout (cmd 0xe4)
Dec 24 22:33:28 atlas kernel: [ 1593.808503] ata2.01: failed to read SCR 2 (Emask=0x4)
Dec 24 22:33:28 atlas kernel: [ 1593.808511] ata2.02: failed to read SCR 2 (Emask=0x40)
Dec 24 22:33:28 atlas kernel: [ 1593.808517] ata2.03: failed to read SCR 2 (Emask=0x40)
Dec 24 22:33:28 atlas kernel: [ 1593.808523] ata2.04: failed to read SCR 2 (Emask=0x40)
Dec 24 22:33:28 atlas kernel: [ 1593.808530] ata2.05: failed to read SCR 2 (Emask=0x40)
Dec 24 22:33:28 atlas kernel: [ 1593.808536] ata2.06: failed to read SCR 2 (Emask=0x40)
Dec 24 22:33:28 atlas kernel: [ 1593.820775] ata2.15: retrying hardreset in 5 secs
Dec 24 22:33:33 atlas kernel: [ 1598.819614] ata2.15: hard resetting link
Dec 24 22:33:36 atlas kernel: [ 1601.017502] ata2.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
Dec 24 22:33:36 atlas kernel: [ 1601.017813] ata2.00: hard resetting link
Dec 24 22:33:36 atlas kernel: [ 1601.269243] ata2.15: qc timeout (cmd 0xe8)
Dec 24 22:33:36 atlas kernel: [ 1601.269278] ata2.00: failed to write SCR 2 (Emask=0x4)
Dec 24 22:33:36 atlas kernel: [ 1601.283353] ata2.00: failed to read SCR 0 (Emask=0x40)
Dec 24 22:33:36 atlas kernel: [ 1601.295645] ata2.15: hard resetting link
Dec 24 22:33:46 atlas kernel: [ 1611.306776] ata2.15: hard resetting link
Dec 24 22:33:48 atlas kernel: [ 1613.501418] ata2.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)

What do you mean by "resetting" the disk array?

tejun