Bug#705454: mdadm: --examine --scan generates wrong #spares

[NeilBrown]

On Tue, 30 Apr 2013 15:42:34 +0200 (CEST) Thorsten Glaser
<t.glaser at tarent.de> wrote:

> reassign 705454 mdadm
> found 705454 3.2.5-5
> retitle 705454 mdadm: --examine --scan generates wrong #spares
> thanks
> 
> I can reproduce this in a "live" sid system by creating
> the md arrays then running this command:
> 
> root at tglase:/ # mdadm --examine --scan
> ARRAY /dev/md0 UUID=b4a6dcca:639ab49e:3cbfd189:3a086020
>    spares=1
> ARRAY /dev/md1 UUID=b1518a63:e8fe3e9f:3cbfd189:3a086020
>    spares=2
> root at tglase:/ # cat /proc/mdstat
> Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath]
> md1 : active raid10 sdf2[4](S) sde2[3] sdd2[2] sdc2[1] sda2[0]
>       975721472 blocks 512K chunks 2 near-copies [4/4] [UUUU]
> 
> md0 : active raid1 sdf1[4](S) sde1[3] sdd1[2] sdc1[1] sda1[0]
>       524224 blocks [4/4] [UUUU]
> 
> unused devices: <none>

"mdadm --examine --scan" looks at all devices, whether they are currently
attached to an md array or not.  Maybe it found a device that looked like a
spare but isn't currently know to md.
What does "mdadm --examine --scan -v" show?  It should list "dev=...." for
each array.

Also you might be wanting 'mdadm --detail --scan' if you  already have the
arrays assembled.

NeilBrown
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