On Tue, 4 Sep 2012, David Brown wrote:
The "raid1" copy you mention will one day be possible with "hot replace"
<http://neil.brown.name/blog/20110216044002#2>
I don't know how far along this idea is at the moment.
https://lwn.net/Articles/465048/
"hot-replace support for RAID4/5/6:
In order to activate hot-replace you need to mark the device as
'replaceable'. This happens automatically when a write error is recorded
in a bad-block log (if you happen to have one).
It can be achieved manually by
echo replaceable > /sys/block/mdXX/md/dev-YYY/state
This makes YYY, in XX, replaceable."
I don't know if it actually made it into 3.2, I believe I saw somewhere
that it was available for 3.3, but Neil Brown should know more.
--
Mikael Abrahamsson email: swmike@xxxxxxxxx
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