EMC FC5300 User Manual download pdf (Page 70)

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EMC Fibre Channel Storage Systems Configuration Planning Guide

Planning LUNs and File Systems with Unshared Direct Storage

Dual SPs and Paths to LUNs

If a storage system has two SPs, there are two routes to its LUNs. If

the server has two adapters and the storage system has two SPs,

Application Transparent Failover (ATF). ATF can automatically

switch to the other path, without disrupting applications, if a device

(such as a host-bus adapter, cable, or SP) fails.

Unshared Direct and Shared-or-Clustered Direct Storage

This section explains the direct (unswitched) options available for

connecting storage systems to servers. As needs change, you may

want to change a configuration. You can do so without changing your

LUN configuration or losing user data.

There are two types of installation:

• Unshared direct with one server is the simplest and least costly;

• Shared-or-clustered direct lets two clustered servers share

storage resources with high availability.

Sample Unshared Direct Installation

Figure 4-1 Unshared Direct Installation

EMC1825

Disk IDs

100-109

010-019

Database

RAID 5

Users

RAID 5

Sys

RAID 1

Clients, mail

RAID 5

SP A SP B

Adapter

Server

Path

Path 2

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 133 134

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EMC FC5300 User Manual Page 70