NonStop NS-Series Planning Guide (H06.05+)

System Configuration Guidelines
HP Integrity NonStop NS-Series Planning Guide—529567-008
6-23
Factory-Default Disk Volume Locations
Factory-Default Disk Volume Locations
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 according to the various controller and
Fibre Channel disk module combinations.
Configurations for Fibre Channel Devices
Storage subsystems in NonStop S-series systems used a fixed hardware layout. Each
enclosure can have up to four controllers for storage devices and up to 16 internal disk
drives. The controllers and disk drives always have a fixed logical location with
standardized location IDs of group-module-slot. Only the group number changes as
determined by the enclosure position in the ServerNet topology.
However, the Integrity NonStop NS-series systems have no fixed boundaries for the
hardware layout. Up to 60 FCSA (or 120 ServerNet addressable controllers) and 240
Fibre Channel disk enclosures are possible, with identification depending on the
ServerNet connection of the IOAM and slot housing in the FCSAs.
Configuration Restrictions for Fibre Channel Devices
To avoid creating configurations that are not fault-tolerant or do not promote high
availability, these 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.
Fibre Channel
Disk Module
(front)
VSD.082.vst
$SYSTEM (bay 1)
$DSMSCM (bay 2)
$AUDIT (bay 3)
$OSS (bay 4)