I mistakenly removed a device and marked it faulty from a RAID 1 array

Problem is im trying to re-add it again but it's still marked as a
faulty spare . Have trawled through mdadm to find how you unmark the
device as faulty but cant seem to find anything

Root partition on opensuse 10.3 is mounted on /dev/md0 (RAID 1) with
members /dev/sda1 and /dev/sdb1

/dev/sdb1 is marked as a faulty spare, but its fine.

How do I sort this mess out?!


# mdadm --detail /dev/md0
/dev/md0:
Version : 01.00.03
Creation Time : Tue Feb 19 10:53:24 2008
Raid Level : raid1
Array Size : 5245176 (5.00 GiB 5.37 GB)
Used Dev Size : 10490352 (5.00 GiB 5.37 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 0
Persistence : Superblock is persistent

Intent Bitmap : Internal

Update Time : Fri Feb 22 11:23:28 2008
State : active, degraded
Active Devices : 1
Working Devices : 1
Failed Devices : 1
Spare Devices : 0

Name : 0
UUID : 3cb012de:895a8a4d:7effc447:a27ea605
Events : 3211

Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 0 0 1 removed

1 8 17 - faulty spare /dev/sdb1