manual/generic/linux/software-raid5
Description
Use Linux utility mdadm to create, rebuilt and delete software RAID5. RAID5 consists of block-level striping with distributed parity.
Maintainer
- chase.qi@linaro.org
OS
- debian
- ubuntu
- centos
- fedora
Scope
- functional
Devices
- d02
- d03
- d05
- overdrive
- moonshot
- thunderX
Steps to reproduce
- 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 RAID5.
- 1) Remove the existing md0. Refer to md0 removing steps above.
- 2) "mdadm --create /dev/md0 --level=5 --raid-devices=3 /dev/sdb1 /dev/sdc1 /dev/sdd1"
- 3) Monitor '/proc/mdstat' to check if md0 created and running.
- 4) "mkfs.ext4 /dev/md0"
- 5) "mount /dev/md0 /mnt"
- 6) "echo 'RAID5 test' > /mnt/raid5-test.txt"
- 7) "mdadm --manage --set-faulty /dev/md0 /dev/sdd1"
- 8) "mdadm --manage /dev/md0 -r /dev/sdd1"
- 9) Verify that '/mnt/raid5-test.txt' is not damaged.
- 10) "mdadm --manage /dev/md0 -a /dev/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"