NonStop NS-Series Planning Guide (H06.04+)

System Configuration Guidelines
HP Integrity NonStop NS-Series Planning Guide—529567-005
6-18
IOAM Enclosure and Disk Storage Considerations
°
A serial cable from each SPON connector on the p-switch carries power-on
signals to the NonStop S-series I/O enclosure. This is a unidirectional SPON
cable used only for connection between a a p-switch in an Integrity NonStop
NS-series system and the IOMF 2 CRU in the NonStop S-series I/O enclosure.
°
If the system has no IOAM enclosures and you want system communications
with the OSM Service Connection and OSM Notification Director, the NonStop
S-series I/O enclosure must provide connection for the dedicated service LAN
via two category 5 Ethernet cables.
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 Fibre Channel disk modules controlled from the Fibre Channel
ServerNet adapter (FCSA).
The FCSA is an end node on the ServerNet and controls Fibre Channel device such as
the Fibre Channel disk module and its drives. For more information on the FCSA, see
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 Fibre Channel
loops.
1
Four FCSAs split between four IOAM
modules, so loss of one module takes down
only alternate primary or mirror Fibre
Channel loop.
1
1
See Fibre Channel Device Configuration Recommendations on page 6-21.
Topic Page
Factory-Default Disk Volume Locations
6-20
Fibre Channel Device Configurations 6-20
Fibre Channel Device Configuration Restrictions 6-21
Fibre Channel Device Configuration Recommendations 6-21
Example IOAM and Fibre Channel Disk Module Configurations 6-23