On 13/04/2011 12:13, NeilBrown wrote:
On Wed, 13 Apr 2011 11:57:24 +0100 John Robinson
<john.robinson@xxxxxxxxxxxxxxxx> wrote:
On 12/04/2011 22:30, Gavin Flower wrote:
[...]
md0 : active raid6 sda3[0] sdb3[4] sdd3[3] sdc3[5](F) sde3[1]
10751808 blocks level 6, 64k chunk, algorithm 2 [5/4] [UU_UU]
This one I don't get:
md0 : active raid6 sda3[0] sde3[1] sdd3[3] sdb3[4] sdc3[5](F)
which ought to be UUUU_ again...
Perhaps `mdadm -D /dev/md[0-2]` would make things clearer...
This is actually more horrible than you imagine.
It isn't really, I was asking for the mdadm -D output precisely to get
the list of role and slot numbers, having noticed there was no slot 2 in
Gavin's setup...
[...]
As the current number is pretty much useless, I should probably change it to
the slot number, or an arbitrarily assigned larger number for spares.
This would be an incompatible change, but I very much doubt anyone uses the
numbers for what they actually are, so I doubt that would really matter.
It has just never really got high on my list of priorities....
Lesson: Ignore the number in [] - it doesn't mean anything useful.
It's not useless, it reflects the order in which devices were added to
the array.
Suggestion: Don't change the number in /proc/mdstat, just sort the
devices by role (i.e. the same order as the UUUU_) instead of device
node, and show spares at the end (as per your arbitrarily-assigned
larger number, which this way you never have to display).
Cheers,
John.
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