NonStop NS2400 Series Planning Guide

For fault tolerance, the primary and backup paths to an ESS logical device (LDEV) must go through
different Fibre Channel switches.
Some storage area procedures, such as reconfiguration, can cause the affected switches to pause.
If the pause is long enough, I/O failure occurs on all paths connected to that switch. If both the
primary and the backup paths are connected to the same switch, the LDEV goes down.
For more information, refer to the documentation that accompanies the ESS.
Tape Drive and Interface Hardware (Optional)
For an overview of tape drives and the interface hardware, see “Fibre Channel Ports to Tape
Devices” (page 85) and “SAS Ports to SAS Tape Devices” (page 85).
Preparation for Other Hardware
This guide provides the specifications only for the NonStop NS2400 system modular cabinets and
enclosures identified earlier in this section. For site preparation specifications for other HP hardware
that will be installed at the site with the NonStop NS2400 systems, consult with your HP account
team. For site preparation specifications relating to hardware from other manufacturers, refer to
the documentation for those devices.
Component Location and Identification in a NonStop NS2400 System
This subsection includes these topics:
• “Terminology” (page 35)
• “Rack and Offset Physical Location ” (page 36)
• “Blade Element Group-Module-Slot Numbering (NS2400)” (page 37)
• “VIO Enclosure Group-Module-Slot Numbering (NS2400)” (page 39)
• “CLIM Connection Group-Module-Slot-Port Numbering (NS2400)” (page 40)
Terminology
These are terms used in locating and describing components in a NonStop NS2400 commercial
system:
DefinitionTerm
Computer system housing that includes a structure of
external panels, front and rear doors, internal racking, and
dual PDUs.
Cabinet
Structure integrated into the cabinet into which
rack-mountable components are assembled.
Rack
The physical location of components installed in a modular
cabinet, measured in U values numbered 1 to 42, with 1U
Rack Offset
at the bottom of the cabinet. A U is 1.75 inches (44
millimeters).
A subset of a system that contains one or more modules.
A group does not necessarily correspond to a single
physical object, such as an enclosure.
Group
A subset of a group that is usually contained in an
enclosure. A module contains one or more slots (or bays).
Module
A module can consist of components sharing a common
interconnect, such as a backplane, or it can be a logical
grouping of components performing a particular function.
A subset of a module that is the logical or physical location
of a component within that module.
Slot (or Bay or Position)
Preparation for Other Hardware 35