raid5 degraded twice, what happened here?

raid5 degraded twice, what happened here?

[Dexter Filmore]

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During the last two weeks my raid5 array degraded while shutting down.
Here's what happened at shutdown last time according to logs:

Mar 29 05:16:27 xerxes shutdown[5690]: shutting down for system halt
Mar 29 05:16:58 xerxes kernel:          res 
40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
Mar 29 05:16:58 xerxes kernel: ata3: soft resetting port
Mar 29 05:17:03 xerxes kernel: ata3: port is slow to respond, please be 
patient (Status 0xd0)
Mar 29 05:17:07 xerxes kernel: ata3: SATA link up 1.5 Gbps (SStatus 113 
SControl 310)
Mar 29 05:17:37 xerxes kernel: ata3.00: qc timeout (cmd 0xec)
Mar 29 05:17:37 xerxes kernel: ata3.00: failed to IDENTIFY (I/O error, 
err_mask=0x4)
Mar 29 05:17:37 xerxes kernel: ata3: failed to recover some devices, retrying 
in 5 secs
Mar 29 05:17:42 xerxes kernel: ata3: hard resetting port
Mar 29 05:17:48 xerxes kernel: ata3: port is slow to respond, please be 
patient (Status 0xff)
Mar 29 05:17:52 xerxes kernel: ata3: SATA link up 1.5 Gbps (SStatus 113 
SControl 310)
Mar 29 05:17:52 xerxes kernel: ata3.00: failed to IDENTIFY (I/O error, 
err_mask=0x3)
Mar 29 05:17:52 xerxes kernel: ata3.00: limiting speed to UDMA/100:PIO3
Mar 29 05:17:52 xerxes kernel: ata3: failed to recover some devices, retrying 
in 5 secs
Mar 29 05:17:57 xerxes kernel: ata3: hard resetting port
Mar 29 05:18:02 xerxes kernel: ata3: port is slow to respond, please be 
patient (Status 0xff)
Mar 29 05:18:06 xerxes kernel: ata3: SATA link up 1.5 Gbps (SStatus 113 
SControl 310)
Mar 29 05:18:06 xerxes kernel: ata3.00: failed to IDENTIFY (I/O error, 
err_mask=0x3)
Mar 29 05:18:06 xerxes kernel: ata3.00: disabled
Mar 29 05:18:07 xerxes kernel: ata3: EH complete
Mar 29 05:18:07 xerxes kernel: sd 2:0:0:0: [sdb] Result: 
hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK,SUGGEST_OK
Mar 29 05:18:07 xerxes kernel: end_request: I/O error, dev sdb, sector 
976751807
Mar 29 05:18:07 xerxes kernel: md: super_written gets error=-5, uptodate=0
Mar 29 05:18:07 xerxes kernel: RAID5 conf printout:


What is this? Controller screwup? Disk oops? Software thing?

Debian Etch r7, mdadm 2.5.6.

Dex


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