Dell AX4-5 Manuel d'utilisateur télécharger pdf (Page 10)

10 Introduction

Figure 1-1. Direct-Attached, Single-Cluster Configuration

EMC PowerPath Limitations in a Direct-Attached Cluster

EMC PowerPath provides failover capabilities and multiple path detection as

well as dynamic load balancing between multiple ports on the same storage

processor. However, 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.

SAN-Attached Cluster

In a SAN-attached cluster, all of the nodes are attached to a single storage

system or to multiple storage systems through a SAN using redundant switch

fabrics. SAN-attached clusters are superior to direct-attached clusters in

configuration flexibility, expandability, and performance.

Figure 1-2 shows a SAN-attached cluster.

cluster node

private network

public network

cluster node

storage system

Fibre Channel

connections

Fibre Channel

connections

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Dell AX4-5 Manuel d'utilisateur Page 10