NonStop S-Series System Expansion and Reduction Guide

The Resizing Process
HP NonStop S-Series System Expansion and Reduction Guide—522465-009
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Impact on Users
Benefits of Different Topologies
The benefits of Tetra 8 topology are:
•
ServerNet adapters can be put in slots that in Tetra 16 topology are reserved for
SEBs and MSEBs.
•
If your current needs are satisfied by a Tetra 8 topology, you do not have to
purchase the extra hardware that a Tetra 16 topology requires.
The benefits of Tetra 16 topology are:
•
You are not limited to the Tetra 8 maximums of eight processors and two I/O
enclosures per processor enclosure.
The number of I/O enclosures that a processor enclosure can support varies
depending on the RVU of your system. Your service provider can tell you the
number of I/O enclosures supported by the RVU that is running on your system.
•
The system can be expanded without a system outage.
Impact on Users
For system resizing to have minimal impact on users and processes, perform online
reduction and expansion tasks during periods of low use (that is, during nonpeak
hours).
System Availability
The availability of your system is determined by the communication among its:
•
Enclosures
•
Disks
•
Processor multifunction (PMF) CRUs
•
I/O multifunction (IOMF) CRUs
•
IOAM enclosures (if used)
•
Peripheral devices
•
Subsystems
For Information About See
Online reduction tasks Section 4, Reducing a System Online
Online expansion tasks Section 6, Expanding a System Online
Caution. When you resize your system, you alter some or all of these paths of
communication. Unless you plan your resizing carefully, you might disrupt
communications in your system and reduce your system’s availability.