Gatekeeper LUN causes multipath failures and scsi reservation errors

Issue

• Log files are showing reservation conflicts on gatekeeper lun

kernel: sd 3:0:2:0: reservation conflict
kernel: sd 3:0:2:0: [sdad] Unhandled error code
kernel: sd 3:0:2:0: [sdad] Result: hostbyte=DID_OK driverbyte=DRIVER_OK
kernel: sd 3:0:2:0: [sdad] CDB: Read(10): 28 00 00 00 00 00 00 00 08 00

• Attempts to probe the reservation of denied with Reservation Conflict

# sg_persist --in -c -d /dev/sdad
  EMC       SYMMETRIX         5874
  Peripheral device type: disk
persistent reservation in: scsi status: Reservation Conflict

• Multipathing fails the path then brings it back repeatedly

multipathd: 360000970000192605025533030303738: remaining active paths: 0
kernel: sd 3:0:2:0: reservation conflict
kernel: sd 3:0:2:0: [sdad] Unhandled error code
kernel: sd 3:0:2:0: [sdad] Result: hostbyte=DID_OK driverbyte=DRIVER_OK
kernel: sd 3:0:2:0: [sdad] CDB: Read(10): 28 00 00 00 00 00 00 00 08 00
kernel: device-mapper: multipath: Failing path 65:208.
kernel: Buffer I/O error on device dm-82, logical block 0
multipathd: 360000970000192605025533030303738: Entering recovery mode: max_retries=6
multipathd: 360000970000192605025533030303738: sdae - tur checker reports path is up