Linux software raid - Revision history

M at 21:49, 25 May 2021

2021-05-25T21:49:50Z

← Older revision		Revision as of 21:49, 25 May 2021
Line 2:		Line 2:

	__TOC__		__TOC__

			=== Fix on reboot ===

			This shit is just horrible. It won't restart on reboot. I need to take time to fix all this shittiness... but for now this got me running after reboot:
			sudo su -
			mdadm --assemble --scan
			# ^ first time, this gave me errors in config, because the array line was in there twice
			# I removed ONE of the lines, and reran...
			mdadm --assemble --scan

			mdadm: /dev/md/0 has been started with 2 drives.

			mount /spiceflow/softraid

	=== Install ===		=== Install ===

M: /* Monitor */

2019-11-08T18:12:50Z

Monitor

← Older revision		Revision as of 18:12, 8 November 2019
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	# sigh		# sigh
	sudo mdadm -F -s --mail m@bitpost.com		sudo mdadm -F -s --mail m@bitpost.com

			Also try the stuff [[Check disk\|here]].

	=== Pray ===		=== Pray ===

	Honestly, you should spend more time on this... before you have to...		Honestly, you should spend more time on this... before you have to...

M: /* Monitor */

2019-03-31T14:40:12Z

Monitor

← Older revision		Revision as of 14:40, 31 March 2019
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	sudo smartctl /dev/sdd -a		sudo smartctl /dev/sdd -a
	sudo smartctl /dev/sde -a		sudo smartctl /dev/sde -a

			# this is supposed to maybe email you on monitoring events... i'll believe it when i get one...
			# there's no way email works... and that notes page warns that it may just silently die on you...
			# sigh
			sudo mdadm -F -s --mail m@bitpost.com

	=== Pray ===		=== Pray ===

	Honestly, you should spend more time on this... before you have to...		Honestly, you should spend more time on this... before you have to...

M at 15:28, 30 March 2019

2019-03-30T15:28:53Z

← Older revision		Revision as of 15:28, 30 March 2019
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	Linux software raid is done via the '''mdraid''' package.		Linux software raid is done via the '''mdraid''' package.

			__TOC__

	=== Install ===		=== Install ===

M at 15:27, 30 March 2019

2019-03-30T15:27:25Z

← Older revision		Revision as of 15:27, 30 March 2019
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	~~==== linux~~ software raid [mdraid~~] ====~~		Linux software raid is done via the '''mdraid''' package.

	=== Install ===		=== Install ===
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	sudo smartctl /dev/sdd -a		sudo smartctl /dev/sdd -a
	sudo smartctl /dev/sde -a		sudo smartctl /dev/sde -a

			=== Pray ===

			Honestly, you should spend more time on this... before you have to...

M at 15:24, 30 March 2019

2019-03-30T15:24:17Z

@@ Line 1: / Line 1: @@
-== linux software raid [mdraid] ==
+==== linux software raid [mdraid] ====
 mdraid has not received the polish it needs to Just Work. It has serious flaws that after hours of learning, still leave you unsure and hanging and most likely bailing out of the entire process. But it is the best thing we have on the planet, so let’s distill it down to the essentials.
@@ Line 24: / Line 26: @@
 * hopefully much later, upon failure, to restore a single drive, set it up as a raid:
      madadm -A /dev/sdd # I THINK! it's all very iffy. Which SUCKS.

M: Created page with "== linux software raid [mdraid] == mdraid has not received the polish it needs to Just Work. It has serious flaws that after hours of learning, still leave you unsure and han..."

2016-03-24T16:46:36Z

Created page with "== linux software raid [mdraid] == mdraid has not received the polish it needs to Just Work. It has serious flaws that after hours of learning, still leave you unsure and han..."

New page

== linux software raid [mdraid] ==

mdraid has not received the polish it needs to Just Work. It has serious flaws that after hours of learning, still leave you unsure and hanging and most likely bailing out of the entire process. But it is the best thing we have on the planet, so let’s distill it down to the essentials.
* check S.M.A.R.T. data of drives – run tests and make sure they are completely healthy!
* clean raid drives of superblock and partition data
mdadm --misc --zero-superblock /dev/sdd && dd if=/dev/zero of=/dev/sdd bs=1M count=100 && mdadm --examine /dev/sdd
mdadm: No md superblock detected on /dev/sdd.
* use whole drives (not drive partitions) in a newly created raid
mdadm --create --verbose /dev/md0 --level=mirror --raid-devices=2 /dev/sdd /dev/sde
mdadm: size set to 3906887488K
mdadm: automatically enabling write-intent bitmap on large array
Continue creating array? yes
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.
watch -n 1 cat /proc/mdstat
# wait 400 FUCKING MINUTES for a GODDAMNED EMPTY 4TB DRIVE to sync with ANOTHER empty 4TB drive, FUCKSAKE
# IF YOU REBOOT BEFORE THAT, IT WILL BE AS IF YOU NEVER SET UP A RAID
* save and reboot and make sure the mdraid service restores the raid
mdadm --detail --scan >>/etc/mdadm.conf
rc-update add mdraid boot
# start then stop then start the /etc/init.d/mdraid service, make sure this works to restore your raid (check /proc/mdstat)
# format /dev/md0 as ext4 and set up an auto mount point in /etc/fstab
# reboot and pray
* hopefully much later, upon failure, to restore a single drive, set it up as a raid:
madadm -A /dev/sdd # I THINK! it's all very iffy. Which SUCKS.