MDADM首先準備一臺Linux系統虛擬機然後添加兩塊兒硬盤，大小爲30G
echo "- - -" >/sys/class/scsi_host/host0/scan
echo "- - -" >/sys/class/scsi_host/host1/scan
echo "- - -" >/sys/class/swcsi_host/host2/scan
重新掃描磁盤把新加的磁盤更新出來
#fdisk/dev/sdb 將磁盤分區
#fdisk-l查看磁盤格式
sdb1的操作和sdc1操作一樣
建立RAID1#mdadm -C/dev/md0 -l 1 -n 2 /dev/sd[bc]1
mdadm: Note: this array has metadata at the startand
may notbe suitable as a boot device. If youplan to
store'/boot' on this device please ensure that
yourboot-loader understands md/v1.x metadata, or use
--metadata=0.90
Continue creating array? yes
mdadm: Defaulting to version 1.2 metadata
mdadm:array /dev/md0 started.
創建文件系統格式化該磁盤陣列
#mkfs.ext4/dev/md0
# mkdir/data
# mount/dev/md0 /data
# ll /data/
total 16
drwx------2 root root 16384 Aug 14 15:21 lost+found
# vi/etc/fstab
在最後添加如下內容
/dev/md0 /data ext4 defaults 0 0
# mdadm -Ds
ARRAY /dev/md0 metadata=1.2name=localhost.localdomain:0 UUID=c03306c3:6afc2397:ba52fc78:2c3332de
寫入到配置文件
# mdadm -Ds>> /etc/mdadm.conf
重新啓動驗證
# Reboot
# cat/proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdb1[0] sdc1[1]
31438720 blocks super 1.2 [2/2] [UU]
unused devices: <none>
模擬故障將sdb 刪除
cat /proc/mdstat查看是否刪除
Personalities : [raid1]
md0 : active raid1 sdb1[0](F) sdc1[1]
31438720 blocks super 1.2 [2/1] [_U]
unused devices: <none>
RAID1重建模擬恢復，還是30G的硬盤，添加新磁盤30G
#fdisk-l /dev/sdb 查看sdb磁盤格式
在線加入新組成單元
# mdadm/dev/md0 -a /dev/sdb1
mdadm: added /dev/sdb1
# cat /proc/mdstatss
Personalities : [raid1]
md0 : active raid1 sdb1[2] sdc1[1]
31438720 blocks super 1.2 [2/1] [_U]
[=>...................] recovery = 7.0% (2201920/31438720) finish=2.4min speed=200174K/sec
unused devices: <none>
在日誌中看到重建的過程
md: bind<sdb1> md: recovery of RAID array md0 md: minimum _guaranteed_ speed: 1000 KB/sec/disk. md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for recovery. md: using 128k window, over a total of 31438720k. md: md0: recovery done. |