HiCommand Dynamic Link Manager (HDLM) for Windows Systems User's Guide (HIT5201-96001, January 2008)

64 Chapter 3 Creating an HDLM Environment
In the above configuration, we recommend that you change MISSCOUNT, which is the
I/O timeout threshold value for a voting disk, to the following value: (greatest-number-
of-paths-connected-to-the-voting-disk x 60 seconds).
If an I/O timeout occurs between a host and a voting disk in the above conditions,
Oracle RAC 10g might regard it as the I/O timeout before the HDLM failover function
checks all the paths. In this case, Oracle RAC 10g determines that an error has occurred
in a node, and re-configures the cluster after node down. For details on how to change
MISSCOUNT, contact the company with which you have a contract for Oracle Support
Services. Note that when you uninstall HDLM from the above configuration, you must
reset the value for MISSCOUNT to the original value. Therefore, we recommend that you
make a note of the original value for MISSCOUNT before changing it.
 If you install HDLM while resident software such as an antivirus program is running, HDLM
might not operate correctly. Before installing HDLM, make sure that you have stopped
any resident software programs.
3.4.6 Notes on New Installations and Upgrade Installations
 When installing HDLM, use only one cable to connect the host and the storage system
until instructed otherwise in the procedure in section
3.6.2. If the host is restarted when
the host and the storage system are connected using multiple paths (multi-path
configuration) at a time other than that indicated in the procedure in section
3.6.2, the
contents of the disk might become invalid.
 HDLM does not support configurations in which the same host can use both a FC-SAN and
an IP-SAN.
 If you install HDLM for the first time, or perform an upgrade installation of HDLM after
the license has expired, a license key is necessary. To update the HDLM license, execute
the dlnkmgr command's set -lic operation. The expiration time of the license key is
determined by the license key specified in the license key file or the input license key
type. For information on license key types and the set operation, see section
7.6.
 Installing HDLM requires 70 MB of free space on the system drive (for the temporary
file).
 Terminate all running programs before installing HDLM.
 If you selected an installation folder for HDLM, and then selected another folder, a
folder other than the last selected folder might be created. Delete the created folder
because a folder other than the last selected folder is not necessary.
 Depending on the environment, installing HDLM might take some time to finish. Do not
terminate the installation process while a progress bar for installation is displayed. The
following is an approximate calculation of the time required for installation:
(5 x number-of-connected paths) seconds
 If installation of HDLM terminates abnormally and a KAPL09016-E message is output,
check whether an HDLM version from another operating system has been installed on the
same drive.
– When an HDLM version from another operating system has been installed:
Uninstall the installed HDLM, and then rerun the installation program.