create raid5 with missing disk; not possible?

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Hello,

I tried to create a raid5 set with 3 partitions and one missing device:

mdadm -C /dev/md1 -R -l5 -n4 /dev/hda3 /dev/hdc3 /dev/hdd3 missing

Later I want to add the fourth device with mdadm /dev/md1 -a /dev/hdb3. But this becomes a spare and I always end up with the missing drive in sync, mdadm -D /dev/md1:

<snip>
3       0        0        0      sync

I want to do this so I can use hdb to transfer data from an harddisk to the raid5 set. Maybe this is only possible with Raid 1 sets?

cheers

Ferenc
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