NonStop NS1000 Planning Guide (H06.05+)

System Configuration Guidelines

HP Integrity NonStop NS1000 Planning Guide—542527-004

6-12

Factory-Default Locations for Disk Volumes

This illustration shows where the factory-default locations for the primary and mirror

system disk volumes reside in separate Fibre Channel disk modules:

FCSA location and cable connections vary depending on the various controller and

Fibre Channel disk module combinations.

Configurations for Fibre Channel Devices

The Integrity NonStop NS1000 system supports up to 4 FCSAs (or 8 ServerNet

addressable controllers) and 16 Fibre Channel disk modules, with identification

depending on the ServerNet connection of the IOAM and slot housing in the FCSAs.

Configuration Restrictions for Fibre Channel Devices

These Fibre Channel device configuration restrictions apply and are invoked by SCF:

•

Primary and mirror disk drives cannot connect to the same Fibre Channel loop.

Loss of the Fibre Channel loop makes both the primary volume and the mirrored

volume inaccessible. This configuration inhibits fault tolerance.

Disk drives in different Fibre Channel disk modules on a daisy-chain connect to the

same Fibre Channel loop.

•

The primary path and backup Fibre Channel communication links to a disk drive

should not connect to FCSAs in the same module of an IOAM enclosure. In a fully

populated system, loss of one FCSA can make up to 56 disk drives inaccessible

on a single Fibre Channel communications path. This configuration is allowed, but

only if you override an SCF warning message.

•

The mirror path and mirror backup Fibre Channel communication links to a disk

drive should not connect to FCSAs in the same module of an IOAM enclosure. In a

fully populated system, loss of one FCSA can make up to 56 disk drives

inaccessible on a single Fibre Channel communications path. This configuration is

allowed, but only if you override an SCF warning message.

Fibre Channel

Disk Module

(front)

VSD.082.vst

$SYSTEM (bay 1)

$DSMSCM (bay 2)

$AUDIT (bay 3)

$OSS (bay 4)