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mdraid will no start at boot

on one of my debian machine i have a error with one md raid.

There are
md0 => /
md1 => /backup
md2 => /samba

md2 is not start/assemble after reboot, my mdadm.conf looks like

ARRAY /dev/md0 metadata=1.2 name=srv01:0
ARRAY /dev/md1 metadata=1.2 name=srv01:1
# this line dones not start on boot
ARRAY /dev/md2 metadata=0.90 UUID=63226122:8d9b97bb:99109359:8e81e636

When I run mdadm --assemble --run /dev/md2 /dev/sdc1 /dev/sdd1 the array
is start.