The persistent reservation of a logical unit (LU) may not be canceled due to some reason when multiple hosts share a volume group rather than making up a cluster configuration using HACMP. In this case, this utility clears the Reservation Key to cancel the persistent reservation.

# /usr/DynamicLinkManager/bin/dlmpr {{-k | -c} [hdiskn] | -h}

where:

-k: specify this parameter to display the Reservation Key. The utility displays an asterisk (*) for a Reservation Key of another host. If the Reservation Key is not set, [0x0000000000000000] is displayed.

-Regist Key: the registered Keys are displayed.

-Key Count: the number of registered Keys is displayed.

-c: specify this parameter to clear the Reservation Key.

hdiskn: specify the physical volume (hdiskn) for which you want to display the Reservation Key. You can specify more than one volume. Note: If you do not specify this parameter, the utility displays the Reservation Keys for all the physical volumes.

-a: when multiple physical volumes (hdiskn) are specified, even if an error occurs during processing, the processing continues for all physical volumes.

-h: displays the format of the utility for clearing HDLM persistent reservation.

Note: [0x????????????????] appears for Reservation Key if the destination storage subsystem does not support the persistent reservation or if a hardware error occurs.

Example to execute the dlmpr utility to display the Reservation Keys for hdisk1, hdisk2, hdisk3, hdisk4, hdisk5, and hdisk6:

# /usr/DynamicLinkManager/bin/dlmpr -k hdisk1 hdisk2 hdisk3 hdisk4 hdisk5 hdisk6

self Reservation Key : [0xaaaaaaaaaaaaaaaa]
hdisk1 Reservation Key : [0xaaaaaaaaaaaaaaaa]
Regist Key : [0xaaaaaaaaaaaaaaaa], Key Count : 1
hdisk2 Reservation Key : [0xbbbbbbbbbbbbbbbb]*
Regist Key : [0xaaaaaaaaaaaaaaaa], Key Count : 2
Regist Key : [0xbbbbbbbbbbbbbbbb], Key Count : 2
hdisk3 Reservation Key : [0xbbbbbbbbbbbbbbbb]*
Regist Key : [0xbbbbbbbbbbbbbbbb], Key Count : 4
hdisk4 Reservation Key : [0xaaaaaaaaaaaaaaaa]
Regist Key : [0xaaaaaaaaaaaaaaaa], Key Count : 4
hdisk5 Reservation Key : [0x0000000000000000]
hdisk6 Reservation Key : [0x0000000000000000]
Regist Key : [0xaaaaaaaaaaaaaaaa], Key Count : 1
Regist Key : [0xbbbbbbbbbbbbbbbb], Key Count : 1

Example to execute the dlmpr utility to clear the Reservation Keys for other hosts (marked by an asterisk (*)):

# /usr/DynamicLinkManager/bin/dlmpr -c hdisk2 hdisk3