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

System Configuration Guidelines
HP Integrity NonStop NS-Series Planning Guide—529567-005
6-22
Fibre Channel Device Configuration
Recommendations
•
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.
•
In systems with one IOAM enclosure:
°
With two FCSAs and two Fibre Channel disk modules, the primary FCSA
resides in module 2 of the IOAM enclosure with the backup FCSA residing in
module 3. (See the example configuration in Two FCSAs, Two FCDMs, One
IOAM Enclosure on page 6-24.)
°
With four FCSAs and four Fibre Channel disk modules, FCSA 1 and FCSA 2
reside in module 2 of the IOAM enclosure with FCSA 3 and FCSA 4 residing in
module 3. (See the example configuration in Four FCSAs, Four FCDMs, One
IOAM Enclosure on page 6-25.)
•
In systems with two or more IOAM enclosures
°
With two FCSAs and two Fibre Channel disk modules, the primary FCSA
resides in IOAM enclosure 1, and the backup FCSA resides in IOAM enclosure
2. (See the example configuration in.)
°
With four FCSAs and four Fibre Channel disk modules, FCSA 1 and FCSA 2
reside in IOAM enclosure 1, and FCSA 3 and FCSA 4 reside in IOAM
enclosure 2. (See the example configuration in Four FCSAs, Four FCDMs,
Two IOAM Enclosures on page 6-27.)
•
Daisy-chain configurations follow the same configuration restrictions and rules that
apply to configrations that are not daisy-chained. (See Daisy-Chain Configurations
on page 6-28.)
•
Fibre Channel disk modules containing mirrored volumes must be installed in
separate chains.
•
Daisy-chained configurations require that all Fibre Channel disk modules reside in
the same cabinet and be physically grouped together.
•
Daisy-chain configurations require an ID expander harness with terminators for
proper Fibre Channel disk module and disk drive identification.