Hub/Switch Installation Guide

Appendix G High Availability

570 September 2002 HPSS Installation Guide

Release 4.5, Revision 2

After setting up sshand scp for your cluster, follow these steps to conﬁgure HAHPSS touse 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 wasinstalled and conﬁgured properly(and if the sshd wasstarted on bothnodes) 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

systemthatmust betakeninto account. Addressingallthesedifferencesis beyondthescope ofthis

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.

Forexample, updatingvolume groupsandﬁlesystemswillhavetobe doneusing HACMP’sSMIT

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

-> HACMP Cluster Services

-> Start Cluster Services