I have two three-disk software-RAID setups. One set of three 1.5TBs in
RAID5, one set of three 1TBs in RAID0. The RAID5 is on the motherboard
host controller, the RAID0 is on the Marvell controller card. ext4
filesystems on both. I was doing an rsync dry run from the RAID0 to the
RAID5 array when rsync failed with I/O error.

dmesg buffer had filled with SATA complaints, so I dug farther back in
syslog and found the trace I provided in the bug description.

I can provide the whole syslog from bootup to current, if desired, but I
don't know how much filtering I can do to remove irrelevant information;
I'm not certain I know everything that would be irrelevant.

FWIW, I'm still in the same boot session. Two of the three RAID0 disks
plugged into the Marvell controller are refusing to respond to SMART
test commands. One of those two shows up in palimpest as no longer being
part of a RAID volume, while the other still shows as being a member.
I'm guessing the RAID0 is a total loss, but that's why I have the RAID5
for backup. :)

-- 
SATA failure, killed RAID0.
https://bugs.launchpad.net/bugs/589783
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