2006隨手札記

LAB %Raid ( a disk fail) 1.create raid5 #mdadm -C /dev/md0 -l 5 -n 3 /dev/sdb{5,6,7} #mkfs.ext3 /dev/md0 #cat /proc/mdstat [root@server1 ~]# cat /proc/mdstat Personalities : [raid6] [raid5] [raid4] [raid0] md1 : active raid0 sdb3[1] sdb2[0] 200192 blocks 64k chunks 2. a disk fail (dev/sdb5) #mdadm --fail /dev/md0 /dev/sdb5 [root@server1 ~]# mdadm --fail /dev/md0 /dev/sdb5 mdadm: set /dev/sdb5 faulty in /dev/md0 [root@server1 ~]# cat /proc/mdstat Personalities : [raid6] [raid5] [raid4] [raid0] md1 : active raid0 sdb3[1] sdb2[0] 200192 blocks 64k chunks md0 : active raid5 sdb7[2] sdb6[1] sdb5[3](F) 200192 blocks level 5, 64k chunk, algorithm 2 [3/2] [_UU] unused devices: 3. remove bad disk #mdadm --remove /dev/md0 /dev/sdb5 #cat /proc/mdstat [root@server1 ~]# mdadm --remove /dev/md0 /dev/sdb5 mdadm: hot removed /dev/sdb5 [root@server1 ~]# cat /proc/mdstat Personalities : [raid6] [raid5] [raid4] [raid0] md1 : active raid0 sdb3[1] sdb2[0] 200192 blocks 64k chunks md0 : active raid5 sdb7[2] sdb6[1] 200192 blocks level 5, 64k chunk, algorithm 2 [3/2] [_UU] unused devices: 4. add a good disk #mdadm -a /dev/md0 /dev/sdb5 #cat /proc/mdstat [root@server1 ~]# cat /proc/mdstat Personalities : [raid6] [raid5] [raid4] [raid0] md1 : active raid0 sdb3[1] sdb2[0] 200192 blocks 64k chunks md0 : active raid5 sdb5[0] sdb7[2] sdb6[1] 200192 blocks level 5, 64k chunk, algorithm 2 [3/2] [_UU] [=>...................] recovery = 9.1% (10144/100096) finish=0.8min speed=1690K/sec unused devices: (Raid5開始Recovery...)