Oracle error message of lost paths during maintenance in Red Hat Enterprise Linux

Issue

During SAN storage maintenance (flashing HBA firmware), Oracle RAC DB 12c reported the following warning messages even though one HBA was still active and there were still at least 2 active paths to the LUN disk.

TABLE SYS.WRP: ADDED INTERVAL PARTITION SYS_P20380 (2247) VALUES LESS THAN (TO_DATE(' 2016-02-26 01:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
Fri Feb 26 00:08:10 2016
WARNING: Read Failed. group:12 disk:0 AU:18934 offset:655360 size:131072
path:/dev/oracleasm/disks/DATA42
         incarnation:0x0 asynchronous result:'I/O error'
         subsys:System krq:0x7ffff4a19660 bufp:0x7fffed10e000 osderr1:0x69b5 osderr2:0x0
         IO elapsed time: 0 usec Time waited on I/O: 0 usec
WARNING: failed to read mirror side 1 of virtual extent 4918 logical extent 0 of file 262 in group [12.4104913322] from disk DATA42  allocation unit 18934 reason error; if possible, will try another mirror side
Errors in file /oracle/admin/diag/rdbms/ddctmprd/ddctmprd1/trace/ddctmprd1_p001_29163.trc  (incident=521828):
ORA-00603: ORACLE server session terminated by fatal error
ORA-24557: error 1115 encountered while handling error 1115; exiting server process
ORA-01115: IO error reading block from file  (block # )
ORA-01115: IO error reading block from file 46 (block # 629584)
ORA-15081: failed to submit an I/O operation to a disk
ORA-15081: failed to submit an I/O operation to a disk
Incident details in: /oracle/admin/diag/rdbms/ddctmprd/ddctmprd1/incident/incdir_521828/ddctmprd1_p001_29163_i521828.trc
Fri Feb 26 00:08:11 2016
Dumping diagnostic data in directory=[cdmp_20160226000811], requested by (instance=1, osid=29163 (P001)), summary=[incident=521828].