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6. Check that the public interface is up on both servers. This is the 10GbE link or the InfiniBand link.

For 10GbE, using

# ethtool p2p1 | grep “Link detected”

If the link is up, the output will display “Link detected: yes”.

For InfiniBand, using

# ibstat | grep “Physical state”

If the link is up, the output will display “Physical state: LinkUp”

7. Check /etc/lvm/lvm.conf, make sure locking_type is set to 3.

# Type 3 uses built-in clustered locking.

# Type 4 uses read-only locking which forbids any operations that might

# change metadata.

locking_type = 3

8. Check the two fence devices: iDrac and APC PDU.

For iDrac, using

# fence_drac5 -o status -a 15.15.10.201 -l root -p calvin -d 5 -x -c admin1

# fence_drac5 -o status -a 15.15.10.202 -l root -p calvin -d 5 -x -c admin1

Expect to see the output of STATUS: ON.

For APC PDU, using

# fence_apc –o status –a 15.15.10.101 –l apc –p apc –n 2

# fence_apc –o status –a 15.15.10.101 –l apc –p apc –n 3

# fence_apc –o status –a 15.15.10.102 –l apc –p apc –n 2

# fence_apc –o status –a 15.15.10.102 –l apc –p apc –n 3

Expect to see the output of STATUS: ON.

A.7.2. Create HA cluster

Before the actual HA cluster construction, please make sure that all steps in section A.7.1 are

successfully completed, otherwise, unexpected issues will appear during the HA cluster

construction.

There are two ways to create and configure Red Hat HA cluster: with Conga GUI and with ccs

commands. For the sake of simplicity, the steps for configuring HA cluster via ccs commands are

provided via a script (/root/config_cluster.sh).

Refer to Red Hat Enterprise Linux 6 Cluster Administration -- Configuring and Managing the High

Availability Add-On. http://docs.redhat.com/docs/en-

US/Red_Hat_Enterprise_Linux/6/pdf/Cluster_Administration/Red_Hat_Enterprise_Linux-6-

Cluster_Administration-en-US.pdf, section 4 and 5.

And, a very good FAQ on Red Hat Cluster Suite is at http://sources.redhat.com/cluster/wiki/FAQ .