HP XP Racks - Manual (Page 320)

• Before you execute the dlmpostrestore utility, stop all application
processes that access HDLM-managed devices.
• Before you execute the dlmpostrestore utility, make sure that no path
errors are occurring. If a path error occurs, release of a reservation may
fail.
dlmpr Utility for Clearing HDLM Persistent Reservation
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. In this case, this utility clears the Reservation Key
to cancel the persistent reservation.
Format
/usr/DynamicLinkManager/bin/dlmpr {{-k | -c} [hdisk-name] [hdisk-
name] ... [-a] | -h}
Parameters
-k
Specify this parameter to display the Reservation Key. The following
explains the items displayed when the -k parameter is specified:
Reservation Key
An asterisk (*) is displayed at the end of the Reservation Key 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.
Note
• Do not use the -c parameter during normal operation.
If you set the reservation policy to PR_shared, the reservation for
all nodes that use the corresponding hdisk is cleared, so hosts that
did not share the reservation can now access the hdisk. This might
lead to data corruption. To clear only the reservation from an
execution node, use dlmrmprshkey Utility for Clearing HDLM
Persistent Reservation (Shared-Host Methodology) on page 7-31 .
If you set the reservation policy to PR_exclusive, data might
become corrupted because another host can now access the
specified hdisk.
7-26
Utility Reference
Hitachi Dynamic Link Manager (for AIX) User Guide