linux学习日记十三 软件磁盘阵列RAID(4)
代码如下: # mdadm --detail /dev/md0 /dev/md0: Version : 1.2 Creation Time : Sun Oct 28 10:03:43 2012 Raid Level : raid5 Array Size : 3068928 (2.93 GiB 3.14 GB) Used Dev Size : 1022976 (999.17 MiB
代码如下:
# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Sun Oct 28 10:03:43 2012
Raid Level : raid5
Array Size : 3068928 (2.93 GiB 3.14 GB)
Used Dev Size : 1022976 (999.17 MiB 1047.53 MB)
Raid Devices : 4
Total Devices : 5
Persistence : Superblock is persistent
Update Time : Sun Oct 28 10:24:42 2012
State : clean, degraded, recovering
Active Devices : 3
Working Devices : 4
Failed Devices : 1
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 512K
Rebuild Status : 6% complete
Name : localhost.localdomain:0 (local to host localhost.localdomain)
UUID : 657db303:887c7b6f:b8d8fc91:dc7b3374
Events : 23
Number Major Minor RaidDevice State
0 8 9 0 active sync /dev/sda9
4 8 13 1 spare rebuilding /dev/sda13
2 8 11 2 active sync /dev/sda11
5 8 12 3 active sync /dev/sda12
1 8 10 - faulty spare /dev/sda10
喝完咖啡后，看一下（其实也就1分钟左右）
代码如下:
# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Sun Oct 28 10:03:43 2012
Raid Level : raid5
Array Size : 3068928 (2.93 GiB 3.14 GB)
Used Dev Size : 1022976 (999.17 MiB 1047.53 MB)
Raid Devices : 4
Total Devices : 5
Persistence : Superblock is persistent
Update Time : Sun Oct 28 10:26:53 2012
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 1
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 512K
Name : localhost.localdomain:0 (local to host localhost.localdomain)
UUID : 657db303:887c7b6f:b8d8fc91:dc7b3374
Events : 43
Number Major Minor RaidDevice State
0 8 9 0 active sync /dev/sda9
4 8 13 1 active sync /dev/sda13
2 8 11 2 active sync /dev/sda11
5 8 12 3 active sync /dev/sda12
1 8 10 - faulty spare /dev/sda10
看到了吧，不用我来给你解释了吧。
接下来，我将出错的磁盘删除并加入新的磁盘：
首先，先新建一个新的分区，这个分区大小要与其他的分区一样大才好。然后再用mdadm删除错误的并加入新的
# fdisk /dev/sda
….下面建新分区步骤省略，如果不知道怎么建，参考我的企鹅日记（一）
# partprobe
# partprobe
[root@localhost ~]# mdadm –manage /dev/md0 –add /dev/sda14 –remove /dev/sda10
mdadm: added /dev/sda14
mdadm: hot removed /dev/sda10 from /dev/md0
代码如下:
# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Sun Oct 28 10:03:43 2012
Raid Level : raid5
Array Size : 3068928 (2.93 GiB 3.14 GB)
Used Dev Size : 1022976 (999.17 MiB 1047.53 MB)
Raid Devices : 4
Total Devices : 5
Persistence : Superblock is persistent
Update Time : Sun Oct 28 10:33:04 2012
State : clean
Active Devices : 4
Working Devices : 5
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 512K
Name : localhost.localdomain:0 (local to host localhost.localdomain)
UUID : 657db303:887c7b6f:b8d8fc91:dc7b3374
Events : 45
Number Major Minor RaidDevice State
0 8 9 0 active sync /dev/sda9
4 8 13 1 active sync /dev/sda13
2 8 11 2 active sync /dev/sda11
5 8 12 3 active sync /dev/sda12
6 8 14 - spare /dev/sda14
看到了吧，结果不用我解释了吧。。哈哈
而这一切的一切都是online的状态下完成的，是不是很NB呢 =_=
====开机自动挂载RAID====
只需要知道/dev/md0的UUID就行
# mdadm –detail /dev/md0 | grep -i uuid
UUID : 657db303:887c7b6f:b8d8fc91:dc7b3374
# vi /etc/mdadm.conf
ARRAY /dev/md0 UUID=657db303:887c7b6f:b8d8fc91:dc7b3374
# vi /etc/fstab，在最后一行加入
/dev/md0 /mnt/raid ext4 defaults 1 2
测试下可行否（这个很重要，因为如果fstab修改不对可能导致开不了机器）
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