磁盘阵列

mdadm命令

mdadm tools

mdadm -C /dev/md1 -l 5 -n 3 /dev/sd{b,c,d}1

cat /proc/mdstat

mdadm --detail /dev/md1

#create raid config file

echo "DEVICE /dev/sdb1 /dev/sdc1 /dev/sdd1 " >> /etc/mdadm.conf

mdadm -Ds >> /etc/mdadm.conf

#mount raid 5

mkfs.exte /dev/md1

mount /dev/md1 /data

#stop raid 5

umount /data

mdadm -S /dev/md1

故障模拟

新添加一块新盘到系统 sde5

mdadm /dev/md1 --add /dev/sde (mdadm -a /dev/md1 /dev/sde1)

mdadm -f /dev/md1 /dev/sdc1

cat /proc/mdstat

md1 : active raid5 sde[3] sdd1[2] sdc1[4](F) sdb1[0]

4192768 blocks level 5, 64k chunk, algorithm 2 [3/2] [U_U]

[=>...................] recovery = 5.7% (121300/2096384) finish=0.8min s

[=>...................] recovery = 5.7% sde recovery 开始接替sdc工作

[===================>.] recovery = 95.5%

#remove /dev/sdc1

mdadm -r /dev/md1 /dev/sdc1

#boot raid

mdadm -As

思考 raid10 raid1+raid1-->raid0 (启动raid中先启动raid1 后启动 raid0 关闭raid 先关上层raid0，在关闭raid1)

ITPub博客

linux从入门到精通-磁盘阵列