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HACMP Installation and Cluster Definition 107
configuration. If the cluster manager is active on some other cluster nodes
but not on the local node, the synchronization operation is aborted.
Before attempting to synchronize a cluster configuration, ensure that all
nodes are powered on, that the HACMP software is installed, and that the
/etc/hosts and /.rhosts files on all nodes include all HACMP boot and service
IP labels.
The /.rhosts file may not be required if you are running HACMP on the SP
system.The SP system uses kerberos as its security infrastructure. If you are
running HACMP on a node with kerberos enabled (usually an SP node, but
could also be a standalone RS/6000 that has been configured with kerberos),
you can set a parameter in HACMP to use “Enhanced Security”. This feature
removes the requirement of TCP/IP access control lists (for example, the
/.rhosts
file) on remote nodes during HACMP configuration. Instead, it uses a
kerberized version of remote commands to accomplish the synchronization.
It should be noted that Kerberos support is not included in standard AIX
4.3.2. However, Kerberos is available in the public domain, and it is possible
to get it and configure it on a non-SP RS/6000 node. This is not very common
though, so you will almost always see HACMP Enhanced Security used on
the SP system.
When you synchronize the cluster topology, there are two options that control
the behavior of this process as follows:
Table 19.
Options for Synchronization of the Cluster Topolog
y
The cluster topology definition (including all node, adapter, and network
module information) is copied to the other nodes in the cluster.
Ignore Cluster
Verification Errors
If you specify yes, the result of the cluster verification
performed as part of synchronization is ignored and the
configuration is synchronized even if verification fails.
If you specify no, the changes are not synchronized if
verification fails. View the error messages in the system
error log to determine the configuration problem.
For information about the
/usr/sbin/cluster/diag/clverify utility, see the
chapter on verifying a cluster configuration in the
HACMP
for AIX, Version 4.3: Administration Guide, SC23-4279
.
Emulate or Actual If you set this field to Emulate, the synchronization will be
an emulation and will not affect the Cluster Manager. If you
set this field to Actual, the synchronization will actually
occur, and any subsequent changes will be made to the
Cluster Manager. Emulate is the default value.