Why does ghost of path status appear in /var/log/messages continually in RHEL 6?

Solution In Progress - Updated -

Issue

The following messages have been showing in /var/log/messages since 11:08, 21 Jan.

Jan 22 08:20:46 localhost multipathd: mpathbd: sdcs - rdac checker reports path is ghost
Jan 22 08:20:46 localhost multipathd: 70:0: reinstated
Jan 22 08:20:46 localhost multipathd: mpathbd: load table [0 1048576000 multipath 3 pg_init_retries 50 queue_if_no_path 1 rdac 2 1 round-robin 0 2 1 70:0 100 135:192 100 round-robin 0 2 1 66:16 100 66:64 100]
Jan 22 08:20:46 localhost kernel: sd 1:0:1:16: rdac: array MD3220_SEI-12, ctlr 0, queueing MODE_SELECT command
Jan 22 08:20:46 localhost kernel: sd 1:0:1:16: rdac: array MD3220_SEI-12, ctlr 0, MODE_SELECT returned with sense 06/94/01
Jan 22 08:20:46 localhost kernel: sd 1:0:1:16: rdac: array MD3220_SEI-12, ctlr 0, retrying MODE_SELECT command
Jan 22 08:20:46 localhost multipathd: mpathbd: sdis - rdac checker reports path is ghost
Jan 22 08:20:46 localhost multipathd: 135:192: reinstated
Jan 22 08:20:46 localhost kernel: sd 1:0:1:16: rdac: array MD3220_SEI-12, ctlr 0, MODE_SELECT completed
Jan 22 08:20:46 localhost kernel: sd 2:0:1:16: rdac: array MD3220_SEI-12, ctlr 0, queueing MODE_SELECT command
Jan 22 08:20:46 localhost kernel: sd 2:0:1:16: rdac: array MD3220_SEI-12, ctlr 0, MODE_SELECT returned with sense 06/94/01
Jan 22 08:20:46 localhost kernel: sd 2:0:1:16: rdac: array MD3220_SEI-12, ctlr 0, retrying MODE_SELECT command
Jan 22 08:20:46 localhost kernel: sd 2:0:1:16: rdac: array MD3220_SEI-12, ctlr 0, MODE_SELECT completed
Jan 22 08:20:46 localhost multipathd: dm-20: add map (uevent)
Jan 22 08:20:46 localhost multipathd: dm-20: devmap already registered
Jan 22 08:20:51 localhost multipathd: mpathbd: sdcs - rdac checker reports path is up
Jan 22 08:20:51 localhost multipathd: 70:0: reinstated
Jan 22 08:20:51 localhost multipathd: mpathbd: load table [0 1048576000 multipath 3 pg_init_retries 50 queue_if_no_path 1 rdac 2 1 round-robin 0 2 1 70:0 100 135:192 100 round-robin 0 2 1 66:16 100 66:64 100]
Jan 22 08:20:51 localhost multipathd: mpathbd: sdis - rdac checker reports path is up
Jan 22 08:20:51 localhost multipathd: 135:192: reinstated
Jan 22 08:20:51 localhost multipathd: dm-20: add map (uevent)
Jan 22 08:20:51 localhost multipathd: dm-20: devmap already registered

What's the cause to occur these messages continually?

Environment

Red Hat Enterprise Linux 6

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