Red Hat DEVICE-MAPPER MULTIPATH 5.2 Bedienungsanleitung PDF herunterladen (Seite 19)

DotHill – Linux Device Mapper Multipath “How To” for Storage Revision 4

multipath -ll [device]

Display the current multipath topology from all available

sources (including path checkers

multipath -v2 [device]

Re-scan path information

multipath -v3

Display all device information including all paths, source of

attributes (e.g., default)

multipath -p group-policy [<device>]

Set group policy to specified policy (e.g., multipath)

multipath [<device>]

To view the current status of all multipath devices, run the multipath utility:

# multipath -ll

mpath1 (3600c0ff0000000000234320d5321e100)

[size=25 GB][features="0"][hwhandler="0"]

\_ round-robin 0 [prio=2]

\_ 2:0:0:0 sdb 8:16 [ready]

\_ 3:0:0:0 sde 8:64 [ready]

mpath2 (3600c0ff0000000000234320d5321e101)

[size=25 GB][features="0"][hwhandler="0"]

\_ round-robin 0 [prio=2]

\_ 2:0:0:1 sdc 8:32 [ready]

\_ 3:0:0:1 sdf 8:80 [ready]

The information in the map is presented by grouping the paths for storage resource with unique

identifiers. The size, features and the corresponding hardware handlers are also shown:

alias (WWID if different from alias) [size] [features] [hardware handler]

A summary line is displayed for each path group:

\_ scheduling_policy path_group_priority [path_group_status]

After that follow a line for each path in the path group:

\_host:channel:ID:LUN devnode major:minor [path_status] [dm_status]

At various time the status of a path may not be know.

The following display shows devices with custom names (values of alias) that were set in the

configuration file. The presence of a single path in each path group is a result of the attribute

failover for the path_grouping_policy:

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 29 30

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Red Hat DEVICE-MAPPER MULTIPATH 5.2 Bedienungsanleitung Seite 19