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

System Configuration Guidelines
HP Integrity NonStop NS-Series Planning Guide—529567-008
6-24
Configuration Recommendations for Fibre Channel
Devices
•
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.
Configuration Recommendations for Fibre Channel Devices
These recommendations apply to FCSA and Fibre Channel disk module
configurations:
•
Primary Fibre Channel disk module connects to the FCSA F-SAC 1.
•
Mirror Fibre Channel disk module connects to the FCSA F-SAC 2.
•
FC-AL port A1 is the incoming port from an FCSA or from another Fibre Channel
disk module.
•
FC-AL port A2 is the outbound port to another Fibre Channel disk module.
•
FC-AL port B2 is the incoming port from an FCSA or from a Fibre Channel disk
module.
•
FC-AL port B1 is the outbound port to another Fibre Channel disk module
•
In a daisy-chain configuration, the ID expander harness determines the enclosure
number. Enclosure 1 is always at the bottom of the chain.
•
FCSAs can be installed in slots 1 through 5 in an IOAM.
•
G4SAs can be installed in slots 1 through 5 in an IOAM.
•
In systems with two or more cabinets, primary and mirror Fibre Channel disk
modules reside in separate cabinets to prevent application or system outage if a
power outage affects one cabinet.
•
With primary and mirror Fibre Channel disk modules in the same cabinet, the
primary Fibre Channel disk module resides in a lower U than the mirror Fibre
Channel disk module.
•
Fibre Channel disk drives are configured with dual paths.
•
Where possible, FCSAs and Fibre Channel disk modules are configured with four
FCSAs and four Fibre Channel disk modules for maximum fault tolerance. If
FCSAs are not in groups of four, then the remaining FCSAs and Fibre Channel
disk modules can be configured in other fault-tolerant configurations such as with
two FCSAs and two Fibre Channel disk modules or four FCSAs and three Fibre
Channel disk modules.