CentOS7 RAID5 configuration notes

: Configure raid 5 (5 drives, three do raid, do two backup)

step:

First, the addition of 5 drives
two, create command with mdadm RAID5
three, and mount a disk array format using
four, simulates the case where the hard disk is damaged

First, add the hard disk 5

Add 5 in the virtual machine hard disk

Second, the use mdadm command to create a RAID5

(1) First check to identify whether the newly added hard disk 5

Sdf can see the already described to recognize the newly added hard disk 5, respectively,
/ dev / sdb, / dev / sdc, / dev / sdd, / dev / sde, / dev / sdf

(2) create a RAID5 using the mdadm command, the name "/ dev / md0"

mdadm -Cv /dev/md0 -n 3 -l 5 -x 2 /dev/sdb /dev/sdc /dev/sdd /dev/sde /dev/sdf

(3) the use of format and mount

1) The ext4 formatted as a RAID format:

mkfs.ext4 /dev/md0

2) Create a mount directory

mkdir /RAID5

3) to mount the file system

mount /dev/md0 /RAID5

4) Check the disk mounting information

df -h

5) View / dev / md0 device information

mdadm -D /dev/md0

Fourth, the simulation with a hard disk damage case

It simulates the case where a hard disk is damaged

The -f argument used mdam / dev / sdb array removed

mdadm /dev/md0 -f /dev/sdb

Look state array (/ dev / sdf replace the failed / dev / sdb):

mdadm -D /dev/md0