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Installing the A4800A Adapter
Looking at Adapter Installation
Chapter 220
During a card replacement operation, SAM performs a Critical Resource
Analysis, which checks all ports on the target card for critical resources
that would be temporarily unavailable while the card is shut down.
Planning and Preparation
SAM will, generally, prevent you from performing OLAR procedures that
would adversely affect other areas of the server. Refer to Configuring
HP-UX For Peripherals, HP Part Number B2355-90698 for detailed
information.
Critical Resources Because power to the slot must be off when the old
card is removed and the new card is inserted, the effects of shutting
down the card’s functions must be carefully considered.
This is particularly important if there is no on-line failover or backup
card to pick up those functions. For example:
• Which mass storage devices will be temporarily disconnected when
the card is shut down?
• Will a critical networking connection be lost?
A critical resource is one that would cause a system crash or prevent the
operation from successfully completing if the resource were temporarily
suspended or disconnected. For example, if the SCSI adapter to be
replaced connects to the unmirrored root disk or swap space, the system
will crash when the card 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.
Fortunately SAM performs a thorough critical resource analysis
automatically, and presents options to you based on its findings. If you
determine that critical resources will be affected by the procedure, you
should replace the card when the server is off-line.
If you must take action immediately, you can use rad to attempt an
on-line addition of a backup card and deletion of the target card.