HP Storage Mirroring V5.1 Software - Manual (Page 24)

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Installation and upgrade notes

Since Storage Mirroring installs device drivers, it is recommended that you update your Windows
Recovery Disk, before installing or making changes to your servers. For detailed instructions on
creating a recovery disk, see your Windows reference manuals. Make sure that you select the
option to backup the registry when building the repair disks.

Because Storage Mirroring has operating system dependent files, if you are upgrading your
operating system (to a new major version, not a service pack) and have Storage Mirroring
installed, you must remove Storage Mirroring prior to the operating system upgrade. Uninstall
Storage Mirroring, perform the operating system upgrade, and then reinstall Storage Mirroring.

If you are installing to a drive other than the drive which contains your system TEMP directory,
the Microsoft Windows Installer will still load approximately 100 MB of data to the TEMP directory
during the installation. If you do not have enough disk space on the drive that contains the TEMP
directory, you may need to change where it is located.

During installation, a file called dtinfo.exe is installed to the Storage Mirroring installation
directory. This program can be run to collect configuration data for use when reporting problems
to customer support. It gathers Storage Mirroring log files; Storage Mirroring and system registry
settings; network configuration information such as IP, WINS, and DNS addresses; and other data
which may be necessary for customer support to troubleshoot issues. After running the
executable, a zip file is automatically created with the information gathered.

Storage Mirroring 5.1 can interoperate back to version 4.5 but is restricted to the following
limitations. The Storage Mirroring clients can only control the same or earlier releases. To
accommodate rolling upgrades, older sources can connect to newer targets, but newer sources
cannot connect to older targets. Configurations not listed in the following chart are not supported.
Storage Mirroring version 5.1 Interoperability

Use the following procedure to upgrade Storage Mirroring on a cluster. If both your source and
target are clusters, use the following procedure on the target cluster first, then on the source.
1. Move all cluster resources to one node.
2. Upgrade to the new version of Storage Mirroring on all of the other (passive) nodes.
3. Shutdown each of the upgraded (passive) nodes.
4. Upgrade to the new version of Storage Mirroring on the first (active) node where the
resources are located.
5. After the (active) node is upgraded, start the other (passive) nodes.
Client Source Target Supported
4.5 5.0, or 5.1 5.0, or 5.1 No
5.0 5.1 5.1 No
5.1 4.5 4.5, 5.0, or 5.1 Yes
5.1 5.0 4.5 No
5.1 5.0 5.0 or 5.1 Yes
5.1 5.1 4.5 or 5.0 No
5.1 5.1 5.1 Yes
NOTE: When performing a rolling upgrade, update the target servers first. After the upgrade
is complete, the sources will automatically reconnect to the targets. Upgrade the
sources when convenient.
If you are using a chained configuration, update the last target first, then update the
middle server acting as both a source and target, and update the production source
last.
If you are using a configuration where the source is an older version than the target,
you will not be able to restore from the newer version target back to the older version
source. You must upgrade the source to the same version as the target before
restoring.