[PVE-User] PVE 4 -> 5, multipath differences?

Marco Gaiarin gaio at sv.lnf.it
Mon Jan 7 10:37:52 CET 2019


Mandi! Sten Aus
  In chel di` si favelave...

> As this is my third storage for not critical data, I don't worry much, but I
> haven't checked if two paths (prio=50) get more load than other two (prio=10).

Apart from the prio, the differences between jessie multipath is that
in jessie all path are active (and hwhandler is '0'), while in stretch
hwhandler is 'ALUA' and only two path are active.

Looking at SCSI path seems al correct: the path active are exactly the
path where the volume in the SAN reside.
Looking at code (git master branch) of multipath-tools seems that
hardware get correctly identified.

So, probably is really the right thing.


But also, i've noted that for some strange mean the blacklist in multipath
does not work as expected. I've:

	blacklist {
	        wwid .*
	}

but still i've log full of:

	Jan  7 09:55:20 ashpool multipathd[470]: sda: spurious uevent, path not found

where SDA is:

	root at ashpool:~# ls -la /dev/disk/by-id/ | grep sda
	lrwxrwxrwx 1 root root    9 gen  7 10:25 scsi-0HP_LOGICAL_VOLUME_00000000 -> ../../sda
	lrwxrwxrwx 1 root root   10 gen  7 10:25 scsi-0HP_LOGICAL_VOLUME_00000000-part1 -> ../../sda1
	lrwxrwxrwx 1 root root   10 gen  7 10:25 scsi-0HP_LOGICAL_VOLUME_00000000-part2 -> ../../sda2
	lrwxrwxrwx 1 root root   10 gen  7 10:25 scsi-0HP_LOGICAL_VOLUME_00000000-part3 -> ../../sda3
	lrwxrwxrwx 1 root root    9 gen  7 10:25 scsi-3600508b1001c4972bd1d4906bb1dc75d -> ../../sda
	lrwxrwxrwx 1 root root   10 gen  7 10:25 scsi-3600508b1001c4972bd1d4906bb1dc75d-part1 -> ../../sda1
	lrwxrwxrwx 1 root root   10 gen  7 10:25 scsi-3600508b1001c4972bd1d4906bb1dc75d-part2 -> ../../sda2
	lrwxrwxrwx 1 root root   10 gen  7 10:25 scsi-3600508b1001c4972bd1d4906bb1dc75d-part3 -> ../../sda3
	lrwxrwxrwx 1 root root    9 gen  7 10:25 scsi-SHP_LOGICAL_VOLUME_PDNNK0BRH9Z27F -> ../../sda
	lrwxrwxrwx 1 root root   10 gen  7 10:25 scsi-SHP_LOGICAL_VOLUME_PDNNK0BRH9Z27F-part1 -> ../../sda1
	lrwxrwxrwx 1 root root   10 gen  7 10:25 scsi-SHP_LOGICAL_VOLUME_PDNNK0BRH9Z27F-part2 -> ../../sda2
	lrwxrwxrwx 1 root root   10 gen  7 10:25 scsi-SHP_LOGICAL_VOLUME_PDNNK0BRH9Z27F-part3 -> ../../sda3
	lrwxrwxrwx 1 root root    9 gen  7 10:25 wwn-0x600508b1001c4972bd1d4906bb1dc75d -> ../../sda
	lrwxrwxrwx 1 root root   10 gen  7 10:25 wwn-0x600508b1001c4972bd1d4906bb1dc75d-part1 -> ../../sda1
	lrwxrwxrwx 1 root root   10 gen  7 10:25 wwn-0x600508b1001c4972bd1d4906bb1dc75d-part2 -> ../../sda2
	lrwxrwxrwx 1 root root   10 gen  7 10:25 wwn-0x600508b1001c4972bd1d4906bb1dc75d-part3 -> ../../sda3

the boot disk, in a hw raid controller.


Boh...

-- 
dott. Marco Gaiarin				        GNUPG Key ID: 240A3D66
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