Environment - RDO HAVANA - iSCSI connection - DM-Multipath enable

[1].Two Volume is attached to the VM instance. /dev/sdb and /dev/sdc are found on Compute node.

# lsscsi
[0:2:0:0]    disk    LSI      MegaRAID SAS RMB 1.12  /dev/sda
[3:0:0:0]    cd/dvd  TEAC     DV-28S-V         J.0B  /dev/sr0
[15:0:0:0]   disk    FUJITSU  ETERNUS_DX400    0000  /dev/sdb
[15:0:0:1]   disk    FUJITSU  ETERNUS_DX400    0000  /dev/sdc

# multipath -ll
mpathc (3600000e00d100000001002af00770000) dm-4 FUJITSU,ETERNUS_DX400
size=2.0G features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=10 status=active
  `- 15:0:0:1 sdc 8:32 active ready running
mpathb (3600000e00d100000001002af00760000) dm-3 FUJITSU,ETERNUS_DX400
size=1.0G features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=10 status=active
  `- 15:0:0:0 sdb 8:16 active ready running
#

[2].detach /dev/sdc

[3]./dev/sdc is not deleted on Compute node /dev/sdc status is failed faulty. Why is not the device file(/dev/sdc) deleted?

# lsscsi
[0:2:0:0]    disk    LSI      MegaRAID SAS RMB 1.12  /dev/sda
[3:0:0:0]    cd/dvd  TEAC     DV-28S-V         J.0B  /dev/sr0
[15:0:0:0]   disk    FUJITSU  ETERNUS_DX400    0000  /dev/sdb
[15:0:0:1]   disk    FUJITSU  ETERNUS_DX400    0000  /dev/sdc

# multipath -ll
Jul 29 18:23:11 | sdc: alua not supported
mpathc (3600000e00d100000001002af00770000) dm-4 FUJITSU,ETERNUS_DX400
size=2.0G features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=0 status=active
  `- 15:0:0:1 sdc 8:32 failed faulty running
mpathb (3600000e00d100000001002af00760000) dm-3 FUJITSU,ETERNUS_DX400
size=1.0G features='0' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=10 status=active
  `- 15:0:0:0 sdb 8:16 active ready  running
#