NonStop NS1200 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.
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 52).
For a list of supported tape devices, ask your service provider to refer to the NonStop NS1200
Hardware Installation Manual.
Preparation for Other Server Hardware
This guide provides the specifications only for the Integrity NonStop NS1200 server 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 Integrity NonStop NS1200 servers,
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
This subsection includes these topics:
• “Terminology” (page 21)
• “Rack and Offset Physical Location” (page 22)
• “Blade Element Group-Module-Slot Numbering” (page 23)
• “VIO Enclosure Group-Module-Slot Numbering” (page 26)
• “Fibre Channel Disk Module Group-Module-Slot Numbering” (page 28)
Terminology
These are terms used in locating and describing components:
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
rackmountable components are assembled.
Rack
The physical location of components installed in a
modular cabinet, measured in U values numbered 1 to
42, with 1U at the bottom of the cabinet. A U is 1.75 inches
(44 millimeters).
Rack Offset
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).
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.
Module
Preparation for Other Server Hardware 21