Global (share) spare disk is important and economic. For example, we create two array md0 and md1, and set a global (share) spare disk, whenever anyone disk of array md0 and md1 is faulty, the mdadm add the global spare disk to this array for recovering automatically. the global (share) spare disk is safety and economic strategy!
steps:
1.modify the /etc/mdadm.conf add spare-group as follows
ARRAY /dev/md0 level=raid6 num-devices=4 UUID=9b2c49f3:aab3a59f:319fd604:8d84ab53 devices=/dev/sda,/dev/sdb,/dev/sdc,/dev/sdd,spare-group=global
ARRAY /dev/md1 level=raid5 num-devices=3 spares=1 UUID=ccfde74d:ddbf8e63:4079f0e2:0c9a0cbc devices=/dev/sde,/dev/sdf,/dev/sdg,/dev/sdh,spare-group=global
2.run mdadm in daemon
mdadm -F -s -m root@localhost -f -d 30
3.test faulty the disk
mdadm /dev/md0 -f /dev/sdc
>>>>>>>> no complete
reference http://winsonz.spaces.live.com/blog/cns!10221e373b076bc9!169.entry
Zhonghua Jiang
jzh800@126.com
2007-8-21
