HP X.25/9000 User's Guide HP-UX 11i v3 (5900-1523, August 2011)

4 OLA/R overview and concepts
Introduction
The letters O, L, A and R stand for On Line Addition [and] Replacement. This, of course, refers to
the ability of a PCI I/O card to be replaced/added to an HP-UX computer system designed to
support this feature without the need for completely shutting down, then re-booting the system or
affecting other system components. The system hardware uses the per-slot power control combined
with operating system support to enable this feature.
Initially, not all add-in cards will have this capability but over time users should see many cards
adding this capability to their set of functions.
IMPORTANT: Certain “Classes” of hardware are not intended for access by users. At this time
this includes Z-class (SuperDome) systems. HP recommends that these systems only be opened by
a qualified HP Engineer. Failure to observe this requirement can invalidate any support agreement
or warranty to which the owner might otherwise be entitled.
IMPORTANT: For those wishing to use OLAR, your system may need to update its system firmware.
For additional details, please refer to the "Read Before Installing or Updating to HP-UX 11i v3"
document.
Important terms and concepts
Table 16 Terms used in this section
MeaningTerm
All aspects of the OLA/R feature including On-line Addition
(OLA) and On-line Replacement (OLR).
OLA/R
A grouping of 1 or more interface card slots that are
powered on or off as a unit.
Power Domain
The interface card which will be added or replaced using
OLA/R, and the card slot it resides in.
target card / target card slot
Interface cards and the card slots they reside in and are
in the same power domain as the target slot.
affected card / affected card slot
IMPORTANT: In many cases, other interface cards and slots within the system are dependent
upon the target card. For example:
• If the target card slot is in a power domain and you temporarily stop power to the target card
slot, you will also stop power to any other card slots (affected card slots) in that power domain.
• If the target card is a multiple-function card (MFC), suspending or deleting drivers for the target
card slot also suspends individual drivers for the multiple hardware paths on that card).
During a card replacement operation, SMH performs a Critical Resource Analysis, which checks
the target card for critical resources that would be lost when the card is shut down.
Planning and preparation
For the most part SMH prevents you from performing OLA/R procedures that would adversly affect
other areas of the server. This section provides you with important information that can help minimize
errors or problems when performing OLA/R procedures.
Introduction 71