manual/generic/linux/software-raid1

Description

Use Linux utility mdadm to create, rebuild and delete software RAID1. RAID1 consists of data mirroring, without parity or striping.

Install OS on the SUT(system under test) and make sure it boots.
Power off the SUT and install three extra hard drives(use sd(b|c|d) here). The three hard drives shoud have the same mode, at least the same capacity.
Boot to OS and make sure mdadm utility installed.
Create 'Linux RAID auto' partition on each of the three hard drives by running the following steps.
1) "fdisk /dev/sdx"
2) Delete all existing partitions with fdisk command "d"
3) Create Linux raid auto partition with fdisk commands "n -> p -> 1 -> enter -> enter -> t -> fd -> w"
Run the following steps to test RAID1.
1) "mdadm --create /dev/md0 --level=mirror --raid-devices=2 /dev/sd[b-c]1"
2) Monitor '/proc/mdstat' to check if md0 created and running.
3) "mkfs.ext4 /dev/md0"
4) "mount /dev/md0 /mnt"
5) "echo 'RAID1 test' > /mnt raid1-test.txt"
6) Intentionally set faulty partition with command "mdadm --manage --set-faulty /dev/md0 /dev/sdc1"
7) Execute "mdadm --detail /dev/md0" and check if RAID array shown as 'degraded' and sdc1 shown as 'faulty spare'.
8) Execute "mdadm --manage /dev/md0 -r /dev/sdc1" to remove sdc1.
9) Verify that '/mnt/raid1-test.txt' is not damaged.
10) Execute "mdadm --manage /dev/md0 -a /dev/sdd1" to add sdd1.
11) Monitor the output of "mdadm --detail /dev/md0" and make sure that md0 'rebuilding' can be finished.
Remove the md0 by running the following steps.
1) "umount /dev/md0"
2) "mdadm --stop /dev/md0"
3) "mdadm --remove /dev/md0"
4) "mdadm --zero-superblock /dev/sdb1 /dev/sdc1 /dev/sdd1"