What is the meaning of 'active ghost running'

# iscsiadm --mode node
10.51.15.186:3260,2 iqn.1992-08.com.netapp:5481.60080e5000323cec00000000529cb60b
10.51.15.183:3260,1 iqn.1992-08.com.netapp:5481.60080e5000323cec00000000529cb60b
10.51.15.185:3260,2 iqn.1992-08.com.netapp:5481.60080e5000323cec00000000529cb60b
10.51.15.184:3260,1 iqn.1992-08.com.netapp:5481.60080e5000323cec00000000529cb60b


# multipath -ll
mpathc (360080e5000323cec0000008352d2e221) dm-13 LSI,INF-01-00
size=2.2T features='3 queue_if_no_path pg_init_retries 50' hwhandler='1 rdac' wp=rw
|-+- policy='round-robin 0' prio=6 status=active
| |- 4:0:0:2 sdj 8:144 active ready running
| `- 6:0:0:2 sdg 8:96 active ready running
`-+- policy='round-robin 0' prio=1 status=enabled
|- 5:0:0:2 sdf 8:80 active ghost running
`- 7:0:0:2 sdi 8:128 active ghost running
mpathb (360080e5000323f980000009552d2e173) dm-14 LSI,INF-01-00
size=2.2T features='3 queue_if_no_path pg_init_retries 50' hwhandler='1 rdac' wp=rw
|-+- policy='round-robin 0' prio=6 status=active
| |- 7:0:0:1 sde 8:64 active ready running
| `- 5:0:0:1 sdc 8:32 active ready running
`-+- policy='round-robin 0' prio=1 status=enabled
|- 4:0:0:1 sdh 8:112 active ghost running
`- 6:0:0:1 sdd 8:48 active ghost running

Found that 'active / ghost / running' means it's a passive path, ready and enabled but not in use.
Active path group has higher priority (6) than the passive path group (1). This is how it is displayed ('ghost') and it is not an error.