On 06/03/2013, at 2:34 AM, Roy Sigurd Karlsbakk [off-list ref] wrote:

quoted

Add spare to array
echo want_replacement > /sys/block/md0/md/dev-sdm/state
Wait 6 hours
Remove failed drive
Job done.

Last time I tried this (lots of kernel versions ago) I had all sorts
of
issues with removing the failed drive and other sticky stuff that
required rebooting to clean up. This "just worked".

This is great. Any idea when that came in?

Btw, with as many as 10 drives in a RAID-6, I'd keep at least one spare permanently there…

Im pretty sure I last tested it about 3.2 or  3.3.

I do keep a permanent spare drive, but with 3 arrays I manually allocate it in the rare event it is required. This drive had not failed out of the array, so the spare sat idle until I proactively replaced the dodgy drive.--
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