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→Recover ARRAY
Enable the array at boot time
Enable the array at boot time
sudo update-initramfs -u
sudo update-initramfs -u
== Create Filesystem ==
=== Using LVM ===
=== Using LVM ===
sudo pvcreate /dev/md0
sudo pvcreate /dev/md0
== LVM and RAID Cheatsheet ==
https://gist.github.com/plepe/52ecc9f18efb32c68d18
https://gist.github.com/plepe/52ecc9f18efb32c68d18
== Add HOT SPARE drive ==
mdadm --add /dev/md0 /dev/sdh1
hdparm -S 180 /dev/[sh]d[a-z] # makes disks to stop spining after 15 mins of inactivity
Add this command to the end of the file /etc/rc.d/rc.local to ensure that it is executed every time the system is booted:
<source lang=bash>#!/bin/sh
#
# This script will be executed *after* all the other init scripts.
# You can put your own initialization stuff in here if you don't
# want to do the full Sys V style init stuff.
touch /var/lock/subsys/local
hdparm -S 180 /dev/[sh]d[a-z]</source>
== Replace Failed Drive ==
== Replace Failed Drive ==
* Identify the failed drive with mdadm -D /dev/md0
* Identify the failed drive with mdadm -D /dev/md0
* Remove the failed drive
* Remove the failed drive
mdadm /dev/md0 --remove /dev/sda
mdadm /dev/md0 --remove /dev/sda
* Add it again
mdadm --manage /dev/mdN -a /dev/sdd1
If a RAID is operated with a spare disk, it will jump in for the disk set to faulty. A rebuild is performed automatically. The disk set to faulty appears in the output of mdadm -D /dev/mdN as faulty spare.
To put it back into the array as a spare disk, it must first be removed using
mdadm --manage /dev/mdN -r /dev/sdX1
and then added again
mdadm --manage /dev/mdN -a /dev/sdd1
root@morpheus:~# ls /dev/mapper/
root@morpheus:~# ls /dev/mapper/
control lvm-music lvm-transmission lvm-video
control lvm-music lvm-transmission lvm-video
root@morpheus:~# mdadm --stop /dev/md0
root@morpheus:~# mdadm --stop /dev/md0
mdadm: stopped /dev/md0
mdadm: stopped /dev/md0
* Copy the partition table to the new disk
https://www.howtoforge.com/tutorial/linux-raid-replace-failed-harddisk/
== Rebuild Array ==
== Force manual resync ==
sudo mdadm --stop /dev/md0
sudo mdadm --stop /dev/md0
sudo mdadm --assemble --run --force --update=resync /dev/md0 /dev/sdl /dev/sdh /dev/sdj /dev/sdk
sudo mdadm --assemble --run --force --update=resync /dev/md0 /dev/sdl /dev/sdh /dev/sdj /dev/sdk
mdadm -D /dev/md0
mdadm -D /dev/md0
== Simulate disk failure ==
sudo mdadm /dev/md0 --fail /dev/sdXX
sudo mdadm /dev/md0 --remove /dev/sdXX
sudo mdadm /dev/md0 --add /dev/sdXX
== Recover ARRAY ==
== Recover ARRAY ==
sudo mdadm --assemble --scan
sudo mdadm --assemble --scan
== Send email alerts ==
Edit /etc/mdadm.conf file:
MAILADDR dustymabe@gmail.com
== References ==
== References ==