NonStop NS14000 Planning Guide (H06.10+)

These paths all exist within the same group. But they are divided between two VIO enclosures,
so the configuration is fault-tolerant. For additional information, see “Fibre Channel Devices”
(page 85).
Fibre Channel Disk Module (FCDM)
The FCDM is a rackmounted enclosure that contains:
• Up to 14 Fibre Channel arbitrated loop disk drives (enclosure front)
• Environmental monitoring unit (EMU) (enclosure rear)
• Fibre Channel arbitrated loop (FC-AL) modules (enclosure rear)
An FCDM connects to the Fibre Channel ports on a VIO enclosure. You can daisy-chain together
up to four FCDMs to reduce the number of Fibre Channel ports required. Up to eight daisy-chain
configurations are supported when using all embedded and optional Fibre Channel ports for a
maximum of 32 FCDMs. This illustration shows a fully populated Fibre Channel disk module:
Tape Drive and Interface Hardware
For an overview of tape drives and the interface hardware, see “Fibre Channel Port to Tape
Devices” (page 84).
For a list of supported tape devices, refer to the NonStop NS14000 Hardware Installation Manual.
Maintenance Switch (Ethernet)
The ProCurve 2524 maintenance switch includes management features that NSAA requires and
provides communication between the Integrity NonStop NS14000 system through the VIO
enclosures, the optional UPS, and the system console running HP NonStop Open System
Management (OSM). The maintenance switch includes 24 ports, which is enough capacity to
support multiple systems. The maintenance switch mounts in the modular cabinet, but no
restrictions exist for its placement.
This illustration shows an example of two maintenance switches installed in the top of a cabinet:
62 Modular System Hardware