Neil Brown írta:

On Monday June 11, tomka@avaxio.net wrote:

quoted

ARRAY /dev/md1 level=raid5 devices=/dev/sd[defg]1 num-devices=3 
spares=1 spare-group=ubul name=ursula:T2 
UUID=fb8ece28:9a6a31f8:700f37f6:7ee91bcf
ARRAY /dev/md0 level=raid5 devices=/dev/sd[abc]1 num-devices=3 
spare-group=ubul name=ursula:T1 UUID=3e420024:281f9bb1:fd9ef39b:c18153b1

You don't want the "devices=" entries in there.  If you leave them
there, and sdg1 does get moved to md0, then on the next restart, md0
won't get assembled properly.

Thanks.

quoted

According to the source:

* If an array has active < raid && spare == 0 && spare_group !=NULL
* Look for another array with spare > 0 and active == raid and same 
spare_group
* if found, choose a device and hotremove/hotadd

This is not happening. What is my mistake?

Is "mdadm --monitor" running?  That is required to perform
spare-migration.

Yes, of course.

tg
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