Administrator's Guide

Installing HyperFabric
Installing HyperFabric Adapters
Chapter 3 47
Planning and Preparation
As mentioned previously, for the most part, SAM prevents the user from
performing OLAR procedures that would adversely affect other areas of
the HP 9000 system. See Configuring HP-UX For Peripherals for detailed
information.
Critical Resources
The effects of shutting down a card’s functions must be considered.
Replacing a card that is still operating can have extensive consequences.
Power to a slot must be turned off when a card is removed and a new
card is inserted.
This is particularly important if there is no online failover or backup
card to pick up those functions. For example:
• Which mass storage devices will be temporarily disconnected when a
card is shut down?
• Will a critical networking connection be lost?
A critical resource is one that would cause a system crash or prevent an
operation from successfully completing if the resource were temporarily
suspended or disconnected. For example, if the SCSI controller is
connected to the unmirrored root disk or swap space, the system will
crash when the SCSI controller is shut down.
During an OLAR procedure, it is essential to check the targeted card for
critical resources, as well as the effects of existing disk mirrors and other
situations where a card’s functions can be taken over by another card
that will not be affected.
As mentioned earlier, SAM performs a thorough CRA automatically, and
presents options based on its findings. If it is determined that critical
resources will be affected by the OLAR procedure, the card could be
replaced when the system is offline. If action must be taken immediately,
an online addition of a backup card and deletion of the target card could
be attempted using the rad command.
Card Compatibility
This section explains card compatibility considerations for doing OLAR.