PCI Token Ring Administrator's Guide

Installing Token Ring
Step 2: Installing Token Ring Hardware
Chapter 1 29
During a card replacement operation, SAM 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, SAM prevents you from performing OLAR procedures
that would adversely affect other areas of the server. This is not true
when using rad.
On-line Addition When adding an interface card, the first issue that
must be resolved is whether the new card is compatible with the system.
Each OLAR-capable PCI slot provides a set amount of power. The
replacement card cannot require more power than is available.
The card must also operate at the slot’s maximum bus frequency. A PCI
card must run at any frequency lower than its maximum capability, but
a card that can only operate at 33 MHz will not work on a bus running at
66 MHz. rad provides information about the bus frequency and power
available at a slot, as well as other slot-related data.
On-line Replacement When replacing an interface card, you must
replace the card with an identical card. This is referred to as like-for-like
replacement and should be strictly adhered to. Using a similar but not
identical card may cause unpredictable results. For example, a newer
version of the target card, which is identical in terms of hardware, may
contain an updated firmware version that could potentially conflict with
the current driver.
When the replacement card is added to the system, the appropriate
driver for that card must be configured in the kernel before beginning
the operation. SAM ensures the correct driver is present. If you have any
target card / target card
slot
The adapter that will be added or
replaced using OLAR, and the slot in
which it resides.
affected card / affected
card slot
The adapters and the slots in which they
reside that are in the same power
domain as the target slot.
Table 1-3 Important Terms (Continued)
Term Meaning