Cluster Server Installation Guide for Solaris x64 5.0 - Storage ...
Cluster Server Installation Guide for Solaris x64 5.0 - Storage ... Cluster Server Installation Guide for Solaris x64 5.0 - Storage ...
16 Introducing VCSVCS basicsNetwork channels for heartbeatingFor the VCS private network, two network channels must be available forheartbeating. These network connections are also used for transmittinginformation.Each Solaris x64 Platform Edition cluster configuration requires at least twonetwork channels between the systems. The requirement for two channelsprotects your cluster against network partitioning. Refer to the Veritas ClusterServer User’s Guide for more information on network partitioning.Figure 1-3 illustrates a two-node VCS cluster where sysA and sysB have twoprivate network connections.Figure 1-3Two nodes connected by two ethernet connectionsVCS private network:Two ethernet connectionssysAShared diskssysBPublic networkPreexisting network partitionsA preexisting network partition refers to a failure in communication channelsthat occurs while the systems are down and VCS cannot respond. When thesystems are booted, VCS is vulnerable to network partitioning, regardless of thecause of the failure.VCS seedingTo protect your cluster from a preexisting network partition, VCS uses a seed. Aseed is a function of GAB that determines whether or not all nodes have joined acluster. For this determination, GAB requires that you declare the number ofnodes in the cluster. Note that only seeded nodes can run VCS.
Introducing VCSVCS basics17GAB automatically seeds nodes when:■■An unseeded node communicates with a seeded nodeAll nodes in the cluster are unseeded but can communicate with each otherWhen the last system starts and joins the cluster, the cluster seeds and startsVCS on all nodes. You can then bring down and restart nodes in anycombination. Seeding remains in effect as long as at least one instance of VCS isrunning somewhere in the cluster.You need to perform a manual seed to run VCS from a cold start (all systemsdown) when one or more systems of the cluster are unavailable. VCS does notstart service groups on a system until it has a seed.
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16 Introducing VCSVCS basicsNetwork channels <strong>for</strong> heartbeatingFor the VCS private network, two network channels must be available <strong>for</strong>heartbeating. These network connections are also used <strong>for</strong> transmittingin<strong>for</strong>mation.Each <strong>Solaris</strong> <strong>x64</strong> Plat<strong>for</strong>m Edition cluster configuration requires at least twonetwork channels between the systems. The requirement <strong>for</strong> two channelsprotects your cluster against network partitioning. Refer to the Veritas <strong>Cluster</strong><strong>Server</strong> User’s <strong>Guide</strong> <strong>for</strong> more in<strong>for</strong>mation on network partitioning.Figure 1-3 illustrates a two-node VCS cluster where sysA and sysB have twoprivate network connections.Figure 1-3Two nodes connected by two ethernet connectionsVCS private network:Two ethernet connectionssysAShared diskssysBPublic networkPreexisting network partitionsA preexisting network partition refers to a failure in communication channelsthat occurs while the systems are down and VCS cannot respond. When thesystems are booted, VCS is vulnerable to network partitioning, regardless of thecause of the failure.VCS seedingTo protect your cluster from a preexisting network partition, VCS uses a seed. Aseed is a function of GAB that determines whether or not all nodes have joined acluster. For this determination, GAB requires that you declare the number ofnodes in the cluster. Note that only seeded nodes can run VCS.
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