I realize this is the developers list and though I am a developer I'm
not a developer
of linux raid, but I can find no other source of answers to these questions:
I've been using linux software raid (5) for a couple of years, having
recently uped
to the 2.6.23 kernel (FC7, was previously on FC5). I just noticed that
my /proc/mdstat shows
$ cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 etherd/e0.0[0] etherd/e0.2[9](S) etherd/e0.9[8]
etherd/e0.8[7] etherd/e0.7[6] etherd/e0.6[5] etherd/e0.5[4]
etherd/e0.4[3] etherd/e0.3[2] etherd/e0.1[1]
3907091968 blocks level 5, 64k chunk, algorithm 2 [9/9] [UUUUUUUUU]
[============>........] resync = 64.5% (315458352/488386496)
finish=2228.0min speed=1292K/sec
unused devices: <none>
and I have no idea where the raid6 came from. The only thing I've found
on raid6
is a wikipedia.org page, nothing on
http://tldp.org/HOWTO/Software-RAID-HOWTO.html
So my questions are:
- Is raid6 documented anywhere? If so, where? I'd like to take advantage
of it if
it's really there.
- Why does my array (which I configured as raid5) have personalities of
raid6 (I can understand why raid4 would be there)?
- Is this a.o.k for a raid5 array?
Thanks
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