Managing Serviceguard Eighteenth Edition, September 2010

cluster by halting the cluster (cmhaltcl), rebooting each node from its original
(pre-upgrade) root disk, and restarting the cluster (cmruncl).
CAUTION: You must reboot all the nodes from their original disks before restarting
the cluster; do not try to restart the cluster with some nodes booted from the upgraded
disks and some booted from the pre-upgrade disks.
Guidelines for Migrating a Cluster with Cold Install
There may be circumstances when you prefer to do a cold install of the HP-UX operating
system rather than an upgrade. A cold install erases the existing operating system and
data and then installs the new operating system and software; you must then restore
the data.
CAUTION: The cold install process erases the existing software, operating system,
and data. If you want to retain any existing software, make sure you back up that
software before migrating.
Checklist for Migration
Use the following as a checklist to prepare the migration.
CAUTION: This is a checklist, not a precise set of steps.
1. Back up the data, including databases, user and application data, volume group
configurations, etc.
NOTE: Data on shared disks, or on local disks in volumes that are not are touched
by the HP-UX installation process, will not normally be erased by the cold install;
you can re-import this data after the cold install. If you intend to do this, you must
do the following before you do the cold install:
• For LVM: create a map file for each LVM volume group and save it as part of
your backup.
• For VxVM: deport disk groups (halting the package should do this).
See “Creating the Storage Infrastructure and Filesystems with LVM, VxVM and
CVM” (page 230) for more information.
2. Halt the cluster applications, and then halt the cluster.
3. Do a cold install of the HP-UX operating system. For more information on the cold
install process, see the HP-UX Installation and Update Guide for the target version
of HP-UX at www.hp.com/go/hpux-core-docs.
4. Install any additional required software that did not come with your version of
the HP-UX Operating Environment.
5. Install Serviceguard. The Serviceguard version must be compatible with the version
of HP-UX installed in item 3 of this list. See the
Guidelines for Migrating a Cluster with Cold Install 461