Hitachi Dynamic Link Manager Software Users Guide for AIX (6.6) (T5208-96010, April 2011)

3. Creating an HDLM Environment
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Re-installation in 3.5.5 Performing an Upgrade Installation or Re-installation of
HDLM.
 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.
3.4.3 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 3.1.3 Cluster Software Supported by HDLM.
 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 3.5.3 Performing a New Installation of HDLM and
3.5.5 Performing an Upgrade Installation or Re-installation of HDLM.
 To set up a virtual SCSI disk MPIO configuration in a client partition, or to use
HACMP 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 7.7 dlmodmset Utility for Setting the HDLM Execution Environment ODM.
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:
1. 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 7.11 dlmrmdev Utility for Deleting