HiCommand Dynamic Link Manager User's Guide (for Windows(R))

3.4.5 Notes on related software

If HDLM is installed on a host in which the MPIO driver has already been installed, the MPIO driver that is bundled with the HDLM CD-ROM overwrites the existing MPIO driver. The MPIO driver consists of the mpio.sys, mpspfltr.sys, and mpdev.sys files.

Do not install any multi-path management software other than HDLM. If multi-path management software other than HDLM has been installed on the host, uninstall the software, and then restart the host before re-installing HDLM.

If you perform an upgrade installation or re-installation of HDLM, a message might appear, asking you to confirm whether you want to overwrite the MPIO driver. If this message appears, stop the installation, make sure that no other multi-path management software is installed, and then retry the installation.

If you use HDLM with Oracle RAC 10g and the following conditions are satisfied, you must change the settings for Oracle RAC 10g after building the environment.

Release of 10.1.0.3.0 or later of Oracle RAC 10g is being used.

A host and a voting disk are connected by multiple paths (in a multi-path configuration) in an FC-SAN 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.

[Contents][Back][Next]

[Trademarks]