Madadm-notes - Revision history

Chubbard at 18:50, 26 November 2024

2024-11-26T18:50:01Z

← Older revision		Revision as of 11:50, 26 November 2024
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	All the damn details of mdadm that you can never remember when a !@#$!#@ drive dies		==All the damn details of mdadm that you can never remember when a !@#$!#@ drive dies==
	* [https://www.thomas-krenn.com/en/wiki/Mdadm_recovery_and_resync\|mdadm resync]		* [https://www.thomas-krenn.com/en/wiki/Mdadm_recovery_and_resync\|mdadm resync]
	* [https://www.howtoforge.com/replacing_hard_disks_in_a_raid1_array\|replace disks RAID1 array]		* [https://www.howtoforge.com/replacing_hard_disks_in_a_raid1_array\|replace disks RAID1 array]
	* [https://www.storagetutorials.com/how-to-create-partition-raid-linux-unix/\|Partitioning examples]		* [https://www.storagetutorials.com/how-to-create-partition-raid-linux-unix/\|Partitioning examples]
			* [https://www.digitalocean.com/community/tutorials/how-to-create-raid-arrays-with-mdadm-on-ubuntu\|Raid 1 on Ubuntu]

	Changing partition types		==Changing partition types==
	* [https://unix.stackexchange.com/questions/593681/changing-label-type-in-arch-linux-cfdisk\|cfdisk examples]		* [https://unix.stackexchange.com/questions/593681/changing-label-type-in-arch-linux-cfdisk\|cfdisk examples]

	sfdisk can mirror two disks (usually) so that you can rebuild quickly..		==sfdisk can mirror two disks (usually) so that you can rebuild quickly..==
	* [https://www.thegeekstuff.com/2017/05/sfdisk-examples/\|sfdisk examples]		* [https://www.thegeekstuff.com/2017/05/sfdisk-examples/\|sfdisk examples]
	* [https://vsido.org/index.php?topic=214.0\|Cylinder boundary issues]		* [https://vsido.org/index.php?topic=214.0\|Cylinder boundary issues]
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	there are ways to do this as a single command with pipes, but it sucks and does not always create the partitions correctly..		there are ways to do this as a single command with pipes, but it sucks and does not always create the partitions correctly..

	safer way: (Assuming sdb is toast)		==safer way: (Assuming sdb is toast)==
	# sfdisk -d /dev/sda > sda.out		# sfdisk -d /dev/sda > sda.out
	# sfdisk /dev/sdb < sda.out		# sfdisk /dev/sdb < sda.out
	# sfdisk -l		# sfdisk -l

			==Quick and dirty, change drive letter as needed:==
			* sudo mdadm --create --verbose /dev/md0 --level=1 --raid-devices=2 /dev/sda /dev/sdb
			* cat /proc/mdstat (wait until synced)
			* sudo mkfs.ext4 -F /dev/md0
			* sudo mkdir -p /mnt/md0
			* sudo mount /dev/md0 /mnt/md0
			* df -h -x devtmpfs -x tmpfs
			* sudo mdadm --detail --scan \| sudo tee -a /etc/mdadm/mdadm.conf
			* sudo update-initramfs -u
			* echo '/dev/md0 /mnt/md0 ext4 defaults,nofail,discard 0 0' \| sudo tee -a /etc/fstab






	[[Category:RAID]]		[[Category:RAID]]

Chubbard at 01:13, 31 October 2021

2021-10-31T01:13:02Z

← Older revision		Revision as of 18:13, 30 October 2021
Line 5:		Line 5:

	Changing partition types		Changing partition types
	8 [https://unix.stackexchange.com/questions/593681/changing-label-type-in-arch-linux-cfdisk\|cfdisk examples]		* [https://unix.stackexchange.com/questions/593681/changing-label-type-in-arch-linux-cfdisk\|cfdisk examples]

	sfdisk can mirror two disks (usually) so that you can rebuild quickly..		sfdisk can mirror two disks (usually) so that you can rebuild quickly..

Chubbard at 01:12, 31 October 2021

2021-10-31T01:12:49Z

← Older revision		Revision as of 18:12, 30 October 2021
Line 3:		Line 3:
	* [https://www.howtoforge.com/replacing_hard_disks_in_a_raid1_array\|replace disks RAID1 array]		* [https://www.howtoforge.com/replacing_hard_disks_in_a_raid1_array\|replace disks RAID1 array]
	* [https://www.storagetutorials.com/how-to-create-partition-raid-linux-unix/\|Partitioning examples]		* [https://www.storagetutorials.com/how-to-create-partition-raid-linux-unix/\|Partitioning examples]

			Changing partition types
			8 [https://unix.stackexchange.com/questions/593681/changing-label-type-in-arch-linux-cfdisk\|cfdisk examples]

	sfdisk can mirror two disks (usually) so that you can rebuild quickly..		sfdisk can mirror two disks (usually) so that you can rebuild quickly..

Chubbard at 01:12, 31 October 2021

2021-10-31T01:12:04Z

← Older revision		Revision as of 18:12, 30 October 2021
Line 1:		Line 1:
	All the damn details of mdadm that you can never remember when a !@#$!#@ drive dies		All the damn details of mdadm that you can never remember when a !@#$!#@ drive dies
	* [https://www.thomas-krenn.com/en/wiki/Mdadm_recovery_and_resync\|mdadm resync]		* [https://www.thomas-krenn.com/en/wiki/Mdadm_recovery_and_resync\|mdadm resync]
	*[https://www.howtoforge.com/replacing_hard_disks_in_a_raid1_array\|replace disks RAID1 array]		* [https://www.howtoforge.com/replacing_hard_disks_in_a_raid1_array\|replace disks RAID1 array]
			* [https://www.storagetutorials.com/how-to-create-partition-raid-linux-unix/\|Partitioning examples]

	sfdisk can mirror two disks (usually) so that you can rebuild quickly..		sfdisk can mirror two disks (usually) so that you can rebuild quickly..

Chubbard at 01:11, 31 October 2021

2021-10-31T01:11:32Z

← Older revision		Revision as of 18:11, 30 October 2021
Line 1:		Line 1:
	All the damn details of mdadm that you can never remember when a !@#$!#@ drive dies		All the damn details of mdadm that you can never remember when a !@#$!#@ drive dies
			* [https://www.thomas-krenn.com/en/wiki/Mdadm_recovery_and_resync\|mdadm resync]
			*[https://www.howtoforge.com/replacing_hard_disks_in_a_raid1_array\|replace disks RAID1 array]

	sfdisk can mirror two disks (usually) so that you can rebuild quickly..		sfdisk can mirror two disks (usually) so that you can rebuild quickly..
	[https://www.thegeekstuff.com/2017/05/sfdisk-examples/\|sfdisk examples]		* [https://www.thegeekstuff.com/2017/05/sfdisk-examples/\|sfdisk examples]
			* [https://vsido.org/index.php?topic=214.0\|Cylinder boundary issues]
			* [https://prefetch.net/blog/index.php/2009/09/12/why-partition-x-does-now-end-on-cylinder-boundary-warnings-dont-matter/\|Boundry warnings]
	there are ways to do this as a single command with pipes, but it sucks and does not always create the partitions correctly..		there are ways to do this as a single command with pipes, but it sucks and does not always create the partitions correctly..

Chubbard: Created page with "All the damn details of mdadm that you can never remember when a !@#$!#@ drive dies sfdisk can mirror two disks (usually) so that you can rebuild quickly.. [https://www.thege..."

2021-10-31T01:08:46Z

Created page with "All the damn details of mdadm that you can never remember when a !@#$!#@ drive dies sfdisk can mirror two disks (usually) so that you can rebuild quickly.. [https://www.thege..."

New page

All the damn details of mdadm that you can never remember when a !@#$!#@ drive dies

sfdisk can mirror two disks (usually) so that you can rebuild quickly..
[https://www.thegeekstuff.com/2017/05/sfdisk-examples/|sfdisk examples]

there are ways to do this as a single command with pipes, but it sucks and does not always create the partitions correctly..

safer way: (Assuming sdb is toast)
# sfdisk -d /dev/sda > sda.out
# sfdisk /dev/sdb < sda.out
# sfdisk -l

[[Category:RAID]]