HP XP Racks - Manual (Page 81)

• If you upgrade or re-install HDLM before you resolve a path failure, LU
reservations might persist without being released. In such a case, use the
utility for clearing HDLM persistent reservations (dlmpr) to release the LU
reservation, if necessary.
• Performing an upgrade installation or re-installation might change the
physical volume (hdisk name). For this reason, you must check and, if
necessary, revise relevant settings, such as the settings for applications
that directly access a hard disk recognized as an HDLM management-
target device. Use the output information of the view operation (with the
-drv parameter) to check the correspondence between the hdisk and the
LU.
Notes on the Virtual I/O Server
• Before you install HDLM, change the ioslevel version of the virtual I/O
server to a version supported by HDLM. For details about the ioslevel
versions supported by HDLM, see Cluster Software Supported by HDLM on
page 3-7 .
• If you want to apply a virtual SCSI disk to a client partition in a virtual I/O
server environment, install HDLM into the virtual I/O server partition. If
you want to apply a virtual HBA to a client partition, install HDLM into the
client partition.
• Specify an hdisk, or a logical volume configured for HDLM, as the virtual
target device. For details about how to configure a virtual target device,
see the installation procedure in Performing a New Installation of HDLM
on page 3-26 and Performing an Upgrade Installation or Re-installation
of HDLM on page 3-38 .
• To set up a virtual SCSI disk MPIO configuration in a client partition, or to
use PowerHA in a client partition, set the hdisk reservation policy in the
virtual I/O server partition to no_reserve.
• If you want to use HDLM in a client partition to which a virtual HBA is
applied by using the virtual I/O server NPIV functionality, set the NPIV
option to on. If the option is not set to on, HDLM might not be able to
recognize a path that goes through the virtual HBA.
To set the NPIV option, execute the dlmodmset utility. For details on this
utility, see dlmodmset Utility for Setting the HDLM Execution Environment
ODM on page 7-22 .
If the HDLM device has already been configured, and NPIV option settings
are changed, stop and restart the host. For a local boot disk environment,
instead of stopping and restarting the host, you can also perform the
following procedure:
a
.
Execute the dlmrmdev utility for deleting HDLM drivers to change the
HDLM device status to Defined, or delete the HDLM driver.
For details on the dlmrmdev utility, see
dlmrmdev Utility for Deleting
HDLM Drivers on page 7-30 .
b
.
Execute the following command to reconfigure the HDLM device:
# cfgmgr
Creating an HDLM Environment
3-15
Hitachi Dynamic Link Manager (for AIX) User Guide