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A Multipath configuration

The ATTO Celerity Fibre Channel host adapter driver supports redundant or multiple paths between

the host system and the EVA storage system. Proper setup of redundant paths ensures high availability

of target disks. In an ideal configuration, each path uses separate Fibre Channel host adapters and

infrastructure hardware (such as cables and switches). This ensures no single point of failure (NSPOF).

However, the ATTO driver supports multiple paths on configurations with single, dual, or quad card

configurations.

Regardless of the complexity of your configuration, there are different ways in which you can configure

paths between the Mac OS X host and the EVA storage system. How you set up your configuration

depends on system and SAN resources.

By default, multipath is enabled when the driver is installed on the system. To configure a multipath

environment:

1. Create a Mac OS X host entry in HP Command View EVA to recognize the WWPNs from the

host system.

2. Present a vdisk to the host system.

3. Use the ATTO Configuration Tool to monitor (and optionally configure) paths.

Multipath configuration guidelines

When planning your SAN, consider the following guidelines:

• HP recommends that you configure Fibre Channel zoning for a single host adapter port WWPN

with a single EVA port WWPN.

• A single host adapter port WWPN zoned with multiple EVA port WWPNs to the same EVA storage

system is supported.

• A single host adapter port WWPN zoned with multiple EVA storage systems is supported.

• A single host adapter port supports I/O load balancing.

• Multiple host adapter ports support I/O load balancing.

• I/O load balancing can span multiple host adapters.

Fibre Channel zoning for multipath environments

This section describes how to configure zoning for a Mac OS X host with multipath connectivity to

two host adapter ports and two EVA ports. The exact procedure can vary, depending on your

configuration.

1. Create a zone that contains:

• The first host adapter port WWPN

• An EVA port WWPN from the first controller

Mac OS X Fibre Channel connectivity to the HP StorageWorks Enterprise Virtual Array storage system

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Mpio DMG Manuel de service Page 43