Re: [dm-devel] NetAPP AFF A220 - Debian - multipathing setup

[Thomas Glanzmann <thomas@glanzmann.de>]

Hello Chris,

> Per multipath.conf(5):

> | strict    Both multipath and multipathd treat only such devices as multipath devices which have been
> |           part of a multipath map previously, and which are  therefore  listed  in  the  wwids_file.
> |           Users can manually set up multipath maps using the multipathd add map command. Once set up
> |           manually, the map is remembered in the wwids file and will be set up automatically in  the
> |           future.

I wasn't aware of that. Thank you for pointing it out and resolving our issue.

> I would guess your wwids/bindings files are empty, and thus you need to
> follow the advice in the manpage: use multipathd add map, or maybe
> multipath -a.

Yes, that helped, once I executed the following commands, it works:

(live) [/etc/multipath] lsblk
NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda      8:0    0 238.5G  0 disk
sdb      8:16   1  58.9G  0 disk
├─sdb1   8:17   1   855M  0 part
└─sdb2   8:18   1     4M  0 part
sdc      8:32   0   750G  0 disk
sdd      8:48   0   750G  0 disk
sr0     11:0    1  1024M  0 rom
(live) [/etc/multipath] multipath -a /dev/sdc
wwid '3600a0980383143687224554b5472596b' added
(live) [/etc/multipath] multipath -l
(live) [/etc/multipath] cat wwids
# 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:
/3600a0980383143687224554b5472596b/
(live) [/etc/multipath] /etc/init.d/multipath-tools restart
Restarting multipath-tools (via systemctl): multipath-tools.service.
(live) [/etc/multipath] multipath -l
3600a0980383143687224554b5472596b dm-0 NETAPP,LUN C-Mode
size=750G features='3 queue_if_no_path pg_init_retries 50' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=0 status=active
| `- 7:0:0:0 sdc 8:32 active undef running
`-+- policy='service-time 0' prio=0 status=enabled
  `- 8:0:0:0 sdd 8:48 active undef running

Cheers,
	Thomas

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