Multipath-IO - Revision history

Sertonix: link eudev article

2023-09-26T09:47:05Z

link eudev article

← Older revision		Revision as of 09:47, 26 September 2023
Line 1:		Line 1:
	Multipath storage I/O is not abled by default on Alpine Linux installation media. Multipath I/O on Linux depends on ''devicemapper'' and ''eudev''.		Multipath storage I/O is not abled by default on Alpine Linux installation media. Multipath I/O on Linux depends on ''devicemapper'' and [[eudev]].

	{{Note\|Booting from multipath I/O device is not supported, it would need changes in [https://gitlab.alpinelinux.org/alpine/mkinitfs/-/tree/master/ ''mkinitfs''] package..}}		{{Note\|Booting from multipath I/O device is not supported, it would need changes in [https://gitlab.alpinelinux.org/alpine/mkinitfs/-/tree/master/ ''mkinitfs''] package..}}

Jirib79 at 19:57, 4 June 2021

2021-06-04T19:57:36Z

← Older revision		Revision as of 19:57, 4 June 2021
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	wwids_file "/etc/multipath/wwids"		wwids_file "/etc/multipath/wwids"

	# cat /etc/multipath/wwids ~~\| sed 's/^/ /'~~		# cat /etc/multipath/wwids
	# Multipath wwids, Version : 1.0		# Multipath wwids, Version : 1.0
	# NOTE: This file is automatically maintained by multipath and multipathd.		# NOTE: This file is automatically maintained by multipath and multipathd.

Jirib79 at 20:12, 15 March 2021

2021-03-15T20:12:45Z

← Older revision		Revision as of 20:12, 15 March 2021
Line 1:		Line 1:
	Multipath storage I/O is not abled by default on Alpine Linux installation media. Multipath I/O on Linux depends on ''devicemapper'' and ''eudev''.		Multipath storage I/O is not abled by default on Alpine Linux installation media. Multipath I/O on Linux depends on ''devicemapper'' and ''eudev''.

	{{~~Expand~~\|~~Root FS on~~ multipath device ~~has~~ not ~~been tested~~.}}		{{Note\|Booting from multipath I/O device is not supported, it would need changes in [https://gitlab.alpinelinux.org/alpine/mkinitfs/-/tree/master/ ''mkinitfs''] package..}}


	# apk add lsscsi multipath sg3_utils		# apk add lsscsi multipath sg3_utils

Jirib79 at 19:52, 15 March 2021

2021-03-15T19:52:08Z

← Older revision		Revision as of 19:52, 15 March 2021
Line 114:		Line 114:
	# rc-update add multipath boot		# rc-update add multipath boot
	# rc-update add multipathd boot		# rc-update add multipathd boot

			[[Category:Storage]]

Jirib79 at 18:16, 15 March 2021

2021-03-15T18:16:24Z

← Older revision		Revision as of 18:16, 15 March 2021
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	/3600140547f7876a3412466aab5f0debf/		/3600140547f7876a3412466aab5f0debf/

	See, wwn are bordered with ''/''.		See, ''wwn'' are bordered with ''/''.

	Let's scan again.		Let's scan again.
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	`- 2:0:0:1 sdb 8:16 active ready running		`- 2:0:0:1 sdb 8:16 active ready running

	If we are happy with the configuration, let's add openrc daemons.		If we are happy with the configuration, let's add ''openrc'' daemons.

	# apk add multipath-tools-openrc		# apk add multipath-tools-openrc
	# rc-update add multipath boot		# rc-update add multipath boot
	# rc-update add multipathd boot		# rc-update add multipathd boot

Jirib79 at 18:15, 15 March 2021

2021-03-15T18:15:37Z

← Older revision		Revision as of 18:15, 15 March 2021
Line 1:		Line 1:
	Multipath storage I/O is not abled by default on Alpine Linux installation media. Multipath I/O on Linux depends on ''devicemapper'' and ''eudev''.		Multipath storage I/O is not abled by default on Alpine Linux installation media. Multipath I/O on Linux depends on ''devicemapper'' and ''eudev''.

			{{Expand\|Root FS on multipath device has not been tested.}}


	# apk add lsscsi multipath sg3_utils		# apk add lsscsi multipath sg3_utils

Jirib79: Jirib79 moved page Multipath to Multipath-IO

2021-03-15T18:06:38Z

Jirib79 moved page Multipath to Multipath-IO

← Older revision	Revision as of 18:06, 15 March 2021
(No difference)

Jirib79: Created page with "Multipath storage I/O is not abled by default on Alpine Linux installation media. Multipath I/O on Linux depends on ''devicemapper'' and ''eudev''. # apk add lsscsi multipat..."

2021-03-15T17:56:09Z

Created page with "Multipath storage I/O is not abled by default on Alpine Linux installation media. Multipath I/O on Linux depends on ''devicemapper'' and ''eudev''. # apk add lsscsi multipat..."

New page

Multipath storage I/O is not abled by default on Alpine Linux installation media. Multipath I/O on Linux depends on ''devicemapper'' and ''eudev''.

# apk add lsscsi multipath sg3_utils
# modprobe dm_mod dm-multipath
# setup-udev

List your SCSI disks.

# lsscsi -isw | grep disk
[2:0:0:0x0000] disk 600140547f7876a3412466aab5f0debf /dev/sda 3600140547f7876a3412466aab5f0debf 1.07GB
[2:0:0:0x0001] disk 600140547f7876a3412466aab5f0debf /dev/sdb 3600140547f7876a3412466aab5f0debf 1.07GB

In most cases your LUNs would be blacklisted, thus following command would probably show no output.

# multipath -v2 -d # dry-run

If so then run more verbose check.

# multipath -v3 -d # dry-run
...skipped...
===== paths list =====
uuid hcil dev dev_t pri dm_st chk_st vend/prod
3600140547f7876a3412466aab5f0debf 2:0:0:0 sda 8:0 50 undef undef LIO-ORG,t
3600140547f7876a3412466aab5f0debf 2:0:0:1 sdb 8:16 50 undef undef LIO-ORG,t
Mar 15 17:32:27 | libdevmapper version 1.02.170 (2020-03-24)
Mar 15 17:32:27 | DM multipath kernel driver v1.14.0
Mar 15 17:32:27 | sda: udev property ID_WWN whitelisted
Mar 15 17:32:27 | wwid 3600140547f7876a3412466aab5f0debf not in wwids file, skipping sda
Mar 15 17:32:27 | sda: orphan path, only one path
Mar 15 17:32:27 | sdb: udev property ID_WWN whitelisted
Mar 15 17:32:27 | wwid 3600140547f7876a3412466aab5f0debf not in wwids file, skipping sdb
Mar 15 17:32:27 | sdb: orphan path, only one path
Mar 15 17:32:27 | unloading alua prioritizer
Mar 15 17:32:27 | unloading const prioritizer
Mar 15 17:32:27 | unloading tur checker

Then check ''multipath'' defaults.

# multipath -t
...skipped...
blacklist {
devnode "!^(sd[a-z]|dasd[a-z]|nvme[0-9])"
device {
vendor "SGI"
product "Universal Xport"
}
...skipped...
}
blacklist_exceptions {
property "(SCSI_IDENT_|ID_WWN)"
}
...skipped...

Thus our ''/dev/sd[ab]'' are not blacklisted but ''ID_WWN'' is used to explicit require ''wwn'' for LUNs.

See where ''wwids'' file is located.

# multipath -t | grep wwids_file
wwids_file "/etc/multipath/wwids"

# cat /etc/multipath/wwids | sed 's/^/ /'
# Multipath wwids, Version : 1.0
# NOTE: This file is automatically maintained by multipath and multipathd.
# You should not need to edit this file in normal circumstances.
#
# Valid WWIDs:

Let's add our LUNs (ie. our ''wwn'' access via two LUNs) to ''/etc/multipath/wwids''.

# multipath -a 3600140547f7876a3412466aab5f0debf
wwid '3600140547f7876a3412466aab5f0debf' added
# egrep -v '^(#|$)' /etc/multipath/wwids
/3600140547f7876a3412466aab5f0debf/

See, *wwn* are bordered with ''/''.

Let's scan again.

# multipath -v2 -d # dry-run
Mar 15 17:46:35 | 3600140547f7876a3412466aab5f0debf: setting dev_loss_tmo is unsupported for protocol scsi:unspec
: 3600140547f7876a3412466aab5f0debf undef LIO-ORG,test0
size=1.0G features='0' hwhandler='1 alua' wp=undef
|-+- policy='service-time 0' prio=50 status=undef
| `- 2:0:0:0 sda 8:0 undef ready running
`-+- policy='service-time 0' prio=50 status=undef
`- 2:0:0:1 sdb 8:16 undef ready running

Let's go real, ie. omit dry-run.

# multipath -v2
Mar 15 17:48:06 | 3600140547f7876a3412466aab5f0debf: setting dev_loss_tmo is unsupported for protocol scsi:unspec
Mar 15 17:48:06 | 3600140547f7876a3412466aab5f0debf: addmap [0 2097152 multipath 0 1 alua 2 1 service-time 0 1 1 8:0 1 service-time 0 1 1 8:16 1]
create: 3600140547f7876a3412466aab5f0debf undef LIO-ORG,test0
size=1.0G features='0' hwhandler='1 alua' wp=undef
|-+- policy='service-time 0' prio=50 status=undef
| `- 2:0:0:0 sda 8:0 undef ready running
`-+- policy='service-time 0' prio=50 status=undef
`- 2:0:0:1 sdb 8:16 undef ready running

# multipath -ll | sed 's/^/ /'
3600140547f7876a3412466aab5f0debf dm-2 LIO-ORG,test0
size=1.0G features='0' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=50 status=active
| `- 2:0:0:0 sda 8:0 active ready running
`-+- policy='service-time 0' prio=50 status=enabled
`- 2:0:0:1 sdb 8:16 active ready running

If we are happy with the configuration, let's add *openrc* daemons.

# apk add multipath-tools-openrc
# rc-update add multipath boot
# rc-update add multipathd boot