The disk id breakdown is actually slightly wrong:
/disk is obvious
@ separates the device address (...
/disk from the device identifier)
w for this disk device type indicates the device identifier is a WWN
32a6b2f6484021d2 is the full WWN of the disk device
,0 is the LUN number.
:a is the partition.
The full WWN is
32... - however, if this is different than what
show-volumes is showing you, then I assume this is one path of a multi-path connection to the disk (for example, a storage array with multiple fibre connections to the same SAN could present the same disk with different WWNs on each storage array SAN connection). The
show-volumes output shows the volume WWN, as opposed to the WWN of the path to get to that volume.
From the Oracle documentation, it appears that this WWN value appears in the output from
probe-scsi-all. Their example is:
FCode Version 1.00.54, MPT Version 2.00, Firmware Version 5.00.17.00
Unit 0 Removable Read Only device TEAC DV-W28SS-R 1.0C
SATA device PhyNum 3
GB Unit 0 Disk SEAGATE ST914603SSUN146G 0868 286739329 Blocks, 146
SASDeviceName 5000c50016f75e4f SASAddress 5000c50016f75e4d PhyNum 1
Target 389 Volume 0
Unit 0 Disk LSI Logical Volume 3000 583983104 Blocks, 298 GB
VolumeDeviceName 33b2999bca4dc677 VolumeWWID 03b2999bca4dc677
Unit 0 Removable Read Only device AMI Virtual CDROM 1.00
VolumeDeviceName 33b2999bca4dc677 VolumeWWID 03b2999bca4dc677 in
389 is the same target number as in
VolumeWWID is the same WWID as in
VolumeDeviceName is the WWN that you need to use to reference the volume.