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Line 116: − === LVM and RAID Cheatsheet ===+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
→Recover ARRAY
sr0 1024M rom </nowiki>
sr0 1024M rom </nowiki>
blkid
<nowiki>/dev/sdh: UUID="45dcb1c7-5dcd-8d8e-7830-0cdc8da5755c" UUID_SUB="c52532c2-fa0b-e5f2-9a71-166b20d63084" LABEL="Morpheus:0" TYPE="linux_raid_member"
/dev/sdj: UUID="45dcb1c7-5dcd-8d8e-7830-0cdc8da5755c" UUID_SUB="524b7cad-dd3d-cd84-2f4b-228f691fb660" LABEL="Morpheus:0" TYPE="linux_raid_member"
/dev/sdk: UUID="45dcb1c7-5dcd-8d8e-7830-0cdc8da5755c" UUID_SUB="f7105152-6eb2-3f7c-28a2-61f0f8c966d8" LABEL="Morpheus:0" TYPE="linux_raid_member"
/dev/sdl: UUID="45dcb1c7-5dcd-8d8e-7830-0cdc8da5755c" UUID_SUB="a7dad691-d287-f1e2-17e2-76cbdd543b27" LABEL="Morpheus:0" TYPE="linux_raid_member"</nowiki>
mdadm -D /dev/md0
<nowiki>/dev/md0:
Version : 1.2
Creation Time : Mon Sep 10 20:22:45 2018
Raid Level : raid5
Used Dev Size : 18446744073709551615
Raid Devices : 4
Total Devices : 4
Persistence : Superblock is persistent
Update Time : Fri Sep 21 03:16:52 2018
State : active, FAILED, Not Started
Active Devices : 3
Working Devices : 4
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 512K
Consistency Policy : unknown
Name : Morpheus:0 (local to host Morpheus)
UUID : 45dcb1c7:5dcd8d8e:78300cdc:8da5755c
Events : 11291
Number Major Minor RaidDevice State
- 0 0 0 removed
- 0 0 1 removed
- 0 0 2 removed
- 0 0 3 removed
- 8 176 0 sync /dev/sdl
- 8 144 3 spare rebuilding /dev/sdj
- 8 112 1 sync /dev/sdh
- 8 160 2 sync /dev/sdk
</nowiki>
=== Create RAID 5 ===
=== Create RAID 5 ===
sudo mdadm --create --verbose /dev/md0 --level=5 --raid-devices=4 /dev/sdi /dev/sdj /dev/sdk /dev/sdl
sudo mdadm --create --verbose /dev/md0 --level=5 --raid-devices=4 /dev/sdi /dev/sdj /dev/sdk /dev/sdl
bitmap: 0/30 pages [0KB], 65536KB chunk
bitmap: 0/30 pages [0KB], 65536KB chunk
unused devices: <none>
</nowiki>
<nowiki>rafa@Morpheus:~$ cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4] [linear] [multipath] [raid0] [raid1] [raid10]
md0 : inactive sdk[2] sdj[4] sdh[1] sdl[0]
15627545950 blocks super 1.2
unused devices: <none>
unused devices: <none>
</nowiki>
</nowiki>
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 ===
pvcreate /dev/md0
sudo pvcreate /dev/md0
vgcreate lvm_group_name /dev/md0
sudo vgcreate lvm_group_name /dev/md0
lvcreate -L30G -nlogical_volume_group_name lvm_group_name
sudo lvcreate -L30G -nlogical_volume_group_name lvm_group_name
mkfs.ext4 /dev/lvm_group_name/logical_volume_group_name
sudo mkfs.ext4 /dev/lvm_group_name/logical_volume_group_name
echo '/dev/lvm_group_name/logical_volume_group_name /mnt/mountdir ext4 defaults,nofail,discard 0 0' | sudo tee -a /etc/fstab
sudo echo '/dev/lvm_group_name/logical_volume_group_name /mnt/mountdir ext4 defaults,nofail,discard 0 0' | sudo tee -a /etc/fstab
=== Using EXT4 ===
=== Using EXT4 ===
== 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 ==
* Identify the failed drive with mdadm -D /dev/md0
if=/dev/disk/by-id/scsi-drive-that-is-dying of=/dev/null
* Remove the failed drive
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/
control lvm-music lvm-transmission lvm-video
root@morpheus:~# dmsetup remove lvm-music
root@morpheus:~# dmsetup remove lvm-transmission
root@morpheus:~# dmsetup remove lvm-video
root@morpheus:~# mdadm --stop /dev/md0
mdadm: stopped /dev/md0
* Copy the partition table to the new disk
https://www.howtoforge.com/tutorial/linux-raid-replace-failed-harddisk/
== Force manual resync ==
sudo mdadm --stop /dev/md0
sudo mdadm --assemble --run --force --update=resync /dev/md0 /dev/sdl /dev/sdh /dev/sdj /dev/sdk
== Check RAID status ==
== Check RAID status ==
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 ==
sudo mdadm --assemble --scan
== Send email alerts ==
Edit /etc/mdadm.conf file:
MAILADDR dustymabe@gmail.com
== References ==
== References ==
https://www.digitalocean.com/community/tutorials/how-to-create-raid-arrays-with-mdadm-on-ubuntu-16-04#top<br />
https://www.digitalocean.com/community/tutorials/how-to-create-raid-arrays-with-mdadm-on-ubuntu-16-04#top<br />