[Bug 587859] Re: ata1: device not ready (errno=-16), forcing hardreset

[Ynot]

I've hit this with a newly added disk to existing (and up until now,
rock solid) raid5 array

New disk
Western Digital 500GB PATA internal hard disk
Model# WD5000AAKB-00H8A0

Tried changing the jumper from CS, but no change

Writes to raid array that exceed approx. 500 KiB/s triggers the "link is slow....hardreset" messages 2-3 times per minute
(tested with fast download torrents, and playing with torrent client's throttle)

Reads from raid array that exceed approx. 2000 KiB/s triggers the "link is slow....hardreset" messages every couple of minutes
(tested with playing various bitrate media files from array)

Do any of the above, and
1) System iowait rises sharply to between 80 & 100% for approx 30 seconds
During that time, any processes using disk stall (and poss. timeout)

2) After that 30 second period message posted in syslog

3) lather, rinse, repeat

-- 
ata1: device not ready (errno=-16), forcing hardreset
https://bugs.launchpad.net/bugs/587859
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