Issue

Nov  9 13:40:54 tlmtsap2 ata_id[12775]: HDIO_GET_IDENTITY failed for '/dev/sdaz'
Nov  9 14:10:54 tlmtsap2 ata_id[16971]: HDIO_GET_IDENTITY failed for '/dev/sdaz'
Nov  9 14:25:54 tlmtsap2 ata_id[18984]: HDIO_GET_IDENTITY failed for '/dev/sdaz'
Nov  9 14:40:54 tlmtsap2 ata_id[21130]: HDIO_GET_IDENTITY failed for '/dev/sdaz'
Nov  9 15:10:54 tlmtsap2 ata_id[25083]: HDIO_GET_IDENTITY failed for '/dev/sdaz'
Nov  9 15:25:54 tlmtsap2 ata_id[27431]: HDIO_GET_IDENTITY failed for '/dev/sdaz'
Nov  9 15:40:54 tlmtsap2 ata_id[29470]: HDIO_GET_IDENTITY failed for '/dev/sdaz'
Nov  9 15:44:46 tlmtsap2 ata_id[30536]: HDIO_GET_IDENTITY failed for '/dev/sdaz'

Nov 09 16:00:29 | sr0: device node name blacklisted
Nov 09 16:00:29 | Discover device /sys/block/sdaz
Nov 09 16:00:29 | sdaz: not found in pathvec
Nov 09 16:00:29 | sdaz: mask = 0x25
Nov 09 16:00:29 | sdaz: dev_t = 67:48
Nov 09 16:00:29 | sdaz: size = 2097152
Nov 09 16:00:29 | sdaz: subsystem = scsi
Nov 09 16:00:29 | sdaz: vendor = HP iLO
Nov 09 16:00:29 | sdaz: product = LUN 00 Media 0
Nov 09 16:00:29 | sdaz: rev = 2.09
Nov 09 16:00:29 | sdaz: h:b:t:l = 11:0:0:0
Nov 09 16:00:29 | sdaz: get_state
Nov 09 16:00:29 | sdaz: path checker = directio (config file default)
Nov 09 16:00:29 | sdaz: checker timeout = 30000 ms (sysfs setting)
Nov 09 16:00:29 | sdaz: state = running

As seen above message, iLO device is mapped with scsi device, sdaz. it's only happening on passive node using multipath of Red Hat Cluster Suite.