NonStop NS-Series Planning Guide (H06.03+)

System Configurations

HP Integrity NonStop NS-Series Planning Guide—529567-004

4-19

IOAM Enclosure and Disk Storage Considerations

IOAM Enclosure and Disk Storage

Considerations

When deciding between one IOAM enclosure or two (or more), consider:

Fibre Channel Devices

This subsection includes:

Currently the only Fibre Channel devices used internally with the Integrity NonStop NS-

series systems are the disk drive enclosures controlled from the Fibre Channel

ServerNet adapter (FCSA). In some documentation for Integrity Nonstop servers, the

disk drive enclosure is also referred to as the Fibre Channel disk module (FCDM).

The FCSA is an end node on the ServerNet and controls Fibre Channel device such as

the disk drive enclosure and its drives. For more information on the FCSA, see Fibre

Channel ServerNet Adapter (FCSA) on page 2-19 or the Fibre-Channel ServerNet

Adapter Installation and Support Guide

One IOAM Enclosure Two IOAM Enclosures

High-availability and fault-tolerant attributes

of a NonStop S-series systems with I/O

enclosures using tetra-8 and tetra-16

topologies.

Greater availability because of multiple

redundant ServerNet paths and FCSAs.

Installing the IOAM enclosures in separate

cabinets prevents application or system

failure if a localized power outage affects only

one cabinet.

Two or four FCSAs split between only two

IOAM modules, so loss of one module takes

down all primary or mirror Fiber Channel

loops.

Four FCSAs split between four IOAM

modules, so loss of one module takes down

only alternate primary or mirror Fiber

Channel loop.

See Fibre Channel Device Configuration Recommendations on page 4-22.

Topic Page

Factory-Default Disk Volume Locations

4-21

Fibre Channel Device Configurations 4-21

Fibre Channel Device Configuration Restrictions 4-22

Fibre Channel Device Configuration Recommendations 4-22

Example IOAM and Disk Drive Enclosure Configurations 4-24