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12 Introduction
Supported Cluster Configurations
The following sections describe the supported cluster configurations.
Direct-Attached Cluster
In a direct-attached cluster, all the nodes of the cluster are directly attached
to a single storage system. In this configuration, the RAID controllers (or
storage processors) on the storage system are connected by cables directly to
the Fibre Channel HBA ports in the nodes.
Figure 1-1 shows a basic direct-attached, single-cluster configuration.
Figure 1-1. Direct-Attached, Single-Cluster Configuration
EMC PowerPath Limitations in a Direct-Attached Cluster
EMC PowerPath
®
provides failover capabilities, multiple path detection, and
dynamic load balancing between multiple ports on the same storage
processor. However, the direct-attached clusters supported by Dell connect to
a single port on each storage processor in the storage system. Because of the
single port limitation, PowerPath can provide only failover protection, not
load balancing, in a direct-attached configuration.
private network
public network
cluster node
Fibre Channel
connections
Fibre Channel
connections
cluster node
storage system