RAID - Revision history

Porcelinux: /* RAID 1 */

2021-11-12T00:10:49Z

RAID 1

2021-11-12T00:10:18Z

RAID 1

← Older revision		Revision as of 00:10, 12 November 2021
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	md1 : active raid1 nvme2n1p1[1] nvme1n1p1[0]		md1 : active raid1 nvme2n1p1[1] nvme1n1p1[0]
	1855726592 blocks super 1.2 [2/2] [UU]		1855726592 blocks super 1.2 [2/2] [UU]
	[>~~.......~~.............] check = 3.9% (~~73907136~~/1855726592) finish=15.~~2min~~ speed=~~1943031K~~/sec		[=======>.............] check = 36.2% (673459008/1855726592) finish=7.9min speed=2462455K/sec

	* write the configuration in the mdadm.conf file, useful in some unusual-boot conditions		* write the configuration in the mdadm.conf file, useful in some unusual-boot conditions

2021-11-12T00:08:07Z

RAID 1

2021-11-12T00:06:02Z

RAID 1

← Older revision		Revision as of 00:06, 12 November 2021
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	160079552 blocks [2/2] [UU]		160079552 blocks [2/2] [UU]
	[>....................] resync = 0.4% (652864/160079552) finish=44.7min speed=59351K/sec		[>....................] resync = 0.4% (652864/160079552) finish=44.7min speed=59351K/sec
	[>....................] check = ~~[>....................] check = 3.9% (73907136/1855726592) finish=15.2min speed=1943031K/sec~~		[>....................] check = 3.9% (73907136/1855726592) finish=15.2min speed=1943031K/sec
	3.9% (73907136/1855726592) finish=15.2min speed=1943031K/sec

	* write the configuration in the mdadm.conf file, useful in some unusual-boot conditions		* write the configuration in the mdadm.conf file, useful in some unusual-boot conditions

2021-11-12T00:05:27Z

RAID 1

← Older revision		Revision as of 00:05, 12 November 2021
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	160079552 blocks [2/2] [UU]		160079552 blocks [2/2] [UU]
	[>....................] resync = 0.4% (652864/160079552) finish=44.7min speed=59351K/sec		[>....................] resync = 0.4% (652864/160079552) finish=44.7min speed=59351K/sec
			[>....................] check = [>....................] check = 3.9% (73907136/1855726592) finish=15.2min speed=1943031K/sec
			3.9% (73907136/1855726592) finish=15.2min speed=1943031K/sec

	* write the configuration in the mdadm.conf file, useful in some unusual-boot conditions		* write the configuration in the mdadm.conf file, useful in some unusual-boot conditions

2021-11-11T23:01:16Z

Creare un raid0 (Dis+Disk+Disk..)

← Older revision		Revision as of 23:01, 11 November 2021
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	grub> quit		grub> quit
	== Creare un raid0 (Dis+Disk+Disk..) ==		== Creare un raid0 (Dis+Disk+Disk..) ==
	''NON FARLO'' ''DON'T DO IT''		'''NON FARLO'' ''DON'T DO IT'''
	localhost ~ # mknod /dev/md0 b 9 0		localhost ~ # mknod /dev/md0 b 9 0
	localhost ~ # mdadm --create /dev/md0 --chunk=64 --level=raid0 --raid-devices=2 /dev/hda7 /dev/hdc1		localhost ~ # mdadm --create /dev/md0 --chunk=64 --level=raid0 --raid-devices=2 /dev/hda7 /dev/hdc1

2021-11-11T23:01:02Z

Creare un raid0 (Dis+Disk+Disk..)

← Older revision		Revision as of 23:01, 11 November 2021
Line 55:		Line 55:
	grub> quit		grub> quit
	== Creare un raid0 (Dis+Disk+Disk..) ==		== Creare un raid0 (Dis+Disk+Disk..) ==
			''NON FARLO'' ''DON'T DO IT''
	localhost ~ # mknod /dev/md0 b 9 0		localhost ~ # mknod /dev/md0 b 9 0
	localhost ~ # mdadm --create /dev/md0 --chunk=64 --level=raid0 --raid-devices=2 /dev/hda7 /dev/hdc1		localhost ~ # mdadm --create /dev/md0 --chunk=64 --level=raid0 --raid-devices=2 /dev/hda7 /dev/hdc1
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	303363200 blocks 64k chunks		303363200 blocks 64k chunks
	unused devices: <none>		unused devices: <none>

	== RAID 1 ==		== RAID 1 ==
	* partitioning: using two identical hard disks:		* partitioning: using two identical hard disks:

2013-12-12T09:41:57Z

comandi al volo

← Older revision		Revision as of 09:41, 12 December 2013
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	per un massimo di 30MB/sec.		per un massimo di 30MB/sec.
	echo "30000" > /proc/sys/dev/raid/speed_limit_max		echo "30000" > /proc/sys/dev/raid/speed_limit_max
			* check for bad blocks on the raid
			cat /sys/block/md0/md/mismatch_cnt

	== recuperare un raid1 ==		== recuperare un raid1 ==

2012-12-16T10:33:11Z

← Older revision		Revision as of 10:33, 16 December 2012
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	resync=DELAYED		resync=DELAYED
	bitmap: 0/33 pages [0KB], 4KB chunk		bitmap: 0/33 pages [0KB], 4KB chunk

			== performance script (not tested yet) ==
			<syntaxhighlight lang=bash>
			#!/bin/bash
			### EDIT THESE LINES ONLY
			RAID_NAME="${1:-md0}"
			# devices seperated by spaces i.e. "a b c d..." between "(" and ")"
			RAID_DRIVES=(b c d e f g)
			# this should be changed to match above line
			blockdev --setra 16384 /dev/sd[bcdefg]
			SPEED_MIN=${2:-5000}
			SPEED_MAX=${3:-50000}
			### DO NOT EDIT THE LINES BELOW
			echo $SPEED_MIN > /proc/sys/dev/raid/speed_limit_min
			echo $SPEED_MAX > /proc/sys/dev/raid/speed_limit_max
			# looping though drives that make up raid -> /dev/sda,/dev/sdb...
			for index in "${RAID_DRIVES[@]}"
			do
			echo 1024 > /sys/block/sd${index}/queue/read_ahead_kb
			echo 256 > /sys/block/sd${index}/queue/nr_request
			# Disabling NCQ on all disks...
			echo 1 > /sys/block/sd${index}/device/queue_depth
			done
			# Set read-ahead.
			echo "Setting read-ahead to 64 MiB for /dev/${RAID_NAME}"
			blockdev --setra 65536 /dev/${RAID_NAME}
			# Set stripe-cache_size
			echo "Setting stripe_cache_size to 16 MiB for /dev/${RAID_NAME}"
			echo 16384 > /sys/block/${RAID_NAME}/md/stripe_cache_size
			echo 8192 > /sys/block/${RAID_NAME}/md/stripe_cache_active
			</syntaxhighlight>

2011-10-29T15:30:28Z

← Older revision		Revision as of 15:30, 29 October 2011
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	~~Il Raid è la soluzione migliore per non rischiare di perdere~~ ''~~tutto~~'' ~~per colpa di discacci malfnzionanti~~.		literally ''"Redundant Array of Inexpensive Disks"'' is a technology used to abstract the concept of data partition out from the physical disks.
	* Appunto, ~~ho questi due discacci (Maxtor molto cattivi) li metto~~ a ~~specchio per:~~
	~~# guadagnare velocità di lettura~~		I will go through the opensource branch of this technique, in particular how to access the RAID level from a generic unix/linux system.
	~~# se un disco muore, l'altro farà il suo lavoro~~
	== mdadm ==		== mdadm ==
	''' Gestore + comune e semplice di dispositivi RAID '''		''' Gestore + comune e semplice di dispositivi RAID '''