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Introduction
On Line Addition and/or Replacement (OLAR)
Configuring HP-UX For Peripherals, HP Part Number B2355-90698 for
detailed information.
Critical Resources
Replacing a card that is still operating can have extensive ramifications.
Since 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 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 un-mirrored 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 it's findings. If you
determine that critical resources will be affected by the procedure, you
could replace the card when the server is off-line, or 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.
Firmware Patch Information
For those wishing to use OLAR, your system may need to update its
firmware. For additional details, please refer to the Readme Before
Installing or Updating to HP-UX 11i document provided with your HP
product.
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Chapter 2
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