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

System Configuration Guidelines
HP Integrity NonStop NS-Series Planning Guide—529567-008
6-20
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:
The only Fibre Channel device used internally with Integrity NonStop NS-series
systems is the Fibre Channel disk module (FCDM). An FCDM and its disk drives are
controlled through the Fibre Channel ServerNet adapter (FCSA). For more information
on the FCSA, see Fibre Channel ServerNet Adapter (FCSA) on page 5-22 or the Fibre-
Channel ServerNet Adapter Installation and Support Guide. For more information on
the Fibre Channel disk module (FCDM), see Fibre Channel Disk Module on page 5-25.
For examples of cable connections between FCSAs and FCDMs, see Example
Configurations of the IOAM Enclosure and Fibre Channel Disk Module on page 6-26.
One IOAM Enclosure Two IOAM Enclosures
High-availability and fault-tolerant attributes
of 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 Configuration Recommendations for Fibre Channel Devices on page 6-24.
Topic Page
Factory-Default Disk Volume Locations
6-23
Configurations for Fibre Channel Devices 6-23
Configuration Restrictions for Fibre Channel Devices 6-23
Configuration Recommendations for Fibre Channel Devices 6-24
Example Configurations of the IOAM Enclosure and Fibre Channel Disk
Module
6-26