drive is a spare, but I want to make it active - how?

I created RAID-10 on 4 drives, and I'm testing it a bit.

I removed one drive, and then added it again.

mdadm --detail says:

        Version : 01.00.03
  Creation Time : Thu Aug 10 10:15:18 2006
     Raid Level : raid10
     Array Size : 779264640 (743.16 GiB 797.97 GB)
    Device Size : 779264640 (371.58 GiB 398.98 GB)

Raid Devices : 4
Total Devices : 4
Preferred Minor : 11
Persistence : Superblock is persistent

Update Time : Thu Aug 10 13:14:44 2006
State : active, degraded, resyncing
Active Devices : 3
Working Devices : 4
Failed Devices : 0
Spare Devices : 1

Layout : near=2, far=1
Chunk Size : 64K

Rebuild Status : 39% complete

Name : 11
UUID : 3f0bf25c:614339d1:31c006be:e823b74d
Events : 13

Number Major Minor RaidDevice State
0 0 0 0 removed
1 8 18 1 active sync /dev/sdb2
2 8 34 2 active sync /dev/sdc2
3 8 50 3 active sync /dev/sdd2

4 8 2 - spare /dev/sda2

So, I have 4 working devices, which include 3 active devices and one spare device.

As I remember, with RAID-1, when I added a spare with "mdadm /dev/mdX -a /dev/sdY", I would see a message "hot added /dev/sdY", and state "spare rebuilding" in "mdadm --detail" output.

Right now I don't see the spare is being rebuilt? Spare HDD LED doesn't blink either, so it would indicate that it's doing nothing.

Why? Is it because the rebuild status is not complete?

Tomasz Chmielewski
http://wpkg.org

All right, it got "spare rebuilding" state after all other drives were rebuilt.

Tomasz Chmielewski
http://wpkg.org