IBM System storage DS6000 Series, Attachment Manual

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Use the scu command to see the reservations on these devices. Figure 19 and
Figure 20 on page 39 show examples of what you see when you use the scu
command. You can associate dsk47 on Alpha1 and Alpha2 with storage unit volume
10a-21380.
alpha1> essvol
DS vol, H/W ID 176:
phys_location = bus-9-targ-0-lun-0
dev_base_name = dsk43
capacity = 3906304
serial_number = SCSI-WWID:01000010:6000-1fe1-4942-4d20-0000-0000-1042-1380
DS vol, H/W ID 225:
phys_location = bus-9-targ-0-lun-7
dev_base_name = dsk47
capacity = 3906304
serial_number = SCSI-WWID:01000010:6000-1fe1-4942-4d20-0000-0000-10a2-1380
alpha2> essvol
DS vol, H/W ID 176:
phys_location = bus-4-targ-0-lun-0
dev_base_name = dsk43
capacity = 3906304
serial_number = SCSI-WWID:01000010:6000-1fe1-4942-4d20-0000-0000-1042-1380
DS vol, H/W ID 225:
phys_location = bus-3-targ-0-lun-1
dev_base_name = dsk47
capacity = 3906304
serial_number = SCSI-WWID:01000010:6000-1fe1-4942-4d20-0000-0000-10a2-1380
Figure 18. Example of the essvol script
alpha1> scu –f /dev/rdisk/dsk47c show reservations
Persistent Reservation Header:
Generation Value: 49
Additional Length: 16
Reservation Descriptors:
Reservation Key: 0x30001
Scope-Specific Address: 0
Reservation Type: 0x5 (Write Exclusive Registrants Only)
Reservation Scope: 0 (LU - full logical unit)
Extent Length: 0
Figure 19. Example of the scu command
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DS6000 Host Systems Attachment Guide