NonStop NS-Series Planning Guide (H06.03+)

Modular System Hardware

HP Integrity NonStop NS-Series Planning Guide—529567-004

2-27

Component Location and Identification

This illustration shows an example of connections between two Integrity NonStop NS-

series server IOAM enclosures and an ESS via the separate Fibre Channel switch:

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.

Component Location and Identification

Topics discussed in this subsection are:

Topic Page

Terminology

2-28

Rack and Offset Physical Location 2-29

Slice Group-Module-Slot Numbering 2-29

LSU Group-Module-Slot Numbering 2-31

Processor Switch Group-Module-Slot Numbering 2-32

IOAM Enclosure Group-Module-Slot Numbering 2-33

Disk Drive Enclosure Group-Module-Slot Numbering 2-34

VST068.vsd

Fibre

Channel

Switch

ESS

IOA M

Enclosure

Fibre Channel

Switch

IOA M

Enclosure

FCSA