Important Information; G.9 Important Information; G.10Routine Ha Operations; Startup The Cluster - IBM Hub/Switch Installation Manual

Appendix G High Availability
After setting up ssh and scp for your cluster, follow these steps to configure HA HPSS to use them:
1. Edit the /var/hahpss/hpss_environment file on either of the cluster nodes, and set the
following environment variables:
HPSS_REMOTE_SHELL=ssh
HPSS_REMOTE_COPY=scp
2. Now synchronize this change to the other node:
% ./hpss_sync.ksh <other_node>
If ssh was installed and configured properly (and if the sshd was started on both nodes) the above
steps will complete your conversion to an ssh-enabled HA HPSS system.

G.9 Important Information

When using HACMP to manage shared resources, there are many differences from a normal AIX
system that must be taken into account. Addressing all these differences is beyond the scope of this
document but it nonetheless very important. It is an absolute necessity that administrators
familiarize themselves with the HACMP for AIX Administration Guide in order to understand
these issues.
For example, updating volume groups and file systems will have to be done using HACMP's SMIT
menus, not the normal LVM commands. Otherwise, the ODMs on the two cluster nodes will get
out of sync.
For the most helpful troubleshooting advice, see the HACMP for AIX Troubleshooting Guide.

G.10Routine HA Operations

G.10.1 Startup the Cluster
To start the HACMP cluster (the HACMP Cluster Manager) on the cluster nodes, there are two
methods.
1. The first method is the most convenient; however, it can only be used if rsh is enabled. It
allows the Cluster Manager to be started on both nodes with a single command:
% smitty hacmp
Cluster System Management
570
-> HACMP Cluster Services
-> Start Cluster Services
September 2002 HPSS Installation Guide
Release 4.5, Revision 2