multipath path_grouping_policy配置

Specifies the default path grouping policy to apply to unspecified multipaths. Possible values include:
failover = 1 path per priority group
multibus = all valid paths in 1 priority group
group_by_serial = 1 priority group per detected serial number
group_by_prio = 1 priority group per path priority value
group_by_node_name = 1 priority group per target node name
The default value is failover.

hdsa
path_grouping_policy    group_by_prio
hdsb
path_grouping_policy    group_by_serial
hdsc
path_grouping_policy    multibus
hdsd
path_grouping_policy    group_by_node_name
hdse
path_grouping_policy    failover

hdsa
[size=7.0T][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=1][active]
 \_ 1:0:0:0 sdb 8:16  [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 2:0:0:0 sdc 8:32  [active][ready]
hdsb
[size=7.0T][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=1][active]
 \_ 1:0:0:1 sdd 8:48  [active][ready]
 \_ 2:0:0:1 sde 8:64  [active][ready]
hdsc
[size=7.0T][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=1][active]
 \_ 1:0:0:2 sdf 8:80  [active][ready]
 \_ 2:0:0:2 sdg 8:96  [active][ready]
hdsd
[size=7.0T][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=1][active]
 \_ 1:0:0:0 sdb 8:16  [active][ready]
 \_ 2:0:0:0 sdc 8:32  [active][ready]
hdse
[size=7.0T][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=1][active]
 \_ 1:0:0:0 sdb 8:16  [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 2:0:0:0 sdc 8:32  [active][ready]