Raid Mdadm 指令

參考
http://linux.vbird.org/linux_basic/0420quota.php#raid

不使用原 GUI 建立Raid 指令

fdisk /dev/sda  
fdisk /dev/sdb
fdisk /dev/sdc 
fdisk /dev/sdd  #將 a,b,c,d 硬碟分區

mdadm --create --auto=yes /dev/md0 --level=5 \
> --raid-devices=4   /dev/sda  /dev/sdb   /dev/sdc  /dev/sdd
以四顆硬碟 raid 為例  sda,sdb,sdc,sdd 建立Raid5 

mke2fs /dev/md0

# modprobe raid0 # mdadm -C /dev/md0 -l 0 -n 3 --homehost=NAS-34 /dev/sd[bcd]1 # mdadm -C /dev/md1 -l 0 -n 3 --homehost=NAS-34 /dev/sd[bcd]2

3. 格式化/dev/md0, md1

# mkfs.ext4 /dev/md0 # mkswap -f /dev/md1






/etc/mdadm.conf 檔案，設定適切的 DEVICE 與 ARRAY 值

DEVICE /dev/sd[abcd]1
ARRAY /dev/md0 devices=/dev/sda1,/dev/sdb1,/dev/sdc1,/dev/sdd1

mdadm --manage --stop /dev/md0

#啟動磁碟陣列

mdadm --assemble --run /dev/md0

#查看RAID狀態

# mdadm --detail /dev/md0

 
熱擴容

砍Raid

umount /dev/md0
mdadm --stop /dev/md0  # to halt the array
mdadm --remove /dev/md0  # to remove the array
mdadm --zero-superblock /dev/sd[abc]1  # delete the superblock from all drives in the array
(edit /etc/mdadm/mdadm.conf to delete any rows related to deleted array)

/dev/ram                /               ext2    defaults                1 1 
/dev/md0        /home   ext3    defaults,usrquota,grpquota      1 1 
/dev/sda2      swap    swap    defaults                0 0 
none                    /proc   proc    defaults                0 0 ~