NAS Executor e7000 v1 - Quick Start Guide

Product Overview
Compaq StorageWorks NAS Executor E7000 Quick Start Guide 1-7
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Writer: Mark Garza File Name: b-ch1 Product Overview.doc
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The cluster maintenance segment is also known as the heartbeat connection between
the nodes. In standard configurations, this connectivity is obtained by the use of a
crossover network cable. The same effect can be achieved by placing the heartbeat
ports on its own switch or VLAN, as illustrated in Figure 1-4 as Eth1. The purpose is
to isolate and guarantee the connectivity between the nodes without interruption. If
interruption occurs, the remaining cluster node will assume the other node has gone
down and initiate a failover. A second cluster heartbeat path is often recommended as
a redundant path. The redundant path is often done over one of the remaining
network segments and is not dedicated.
The client data segments of a cluster must reside on identical network segments for
each node. As illustrated in Figure 1-4, Eth2 from both nodes is shown on the same
segment and Eth3 from both nodes is shown on the same segment. This co-location
on the same segment allows cluster resources such as file shares to failover to the
second node and continues to provide availability to the resources. The failed
resource will have the same IP address after the failover and therefore must have a
port corresponding to the identified subnet of the IP address present on both nodes.
The NAS E7000 supports the use of NIC teaming in clustered configurations. All
previous caveats from the NAS E7000 single node deployment on networks section
still apply.