HP HyperFabric manual Planning and Preparation, Critical Resources, Card Compatibility

Installing HyperFabric

Installing HyperFabric Adapters

IMPORTANT	In many cases, other interface cards and slots within the system are dependent on the
	target card. For example, if the target card is a multiple-port card, 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, SAM performs a Critical Resource Analysis
	(CRA), 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
	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.
	Fortunately, 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 rad.
	Card Compatibility
	This section explains card compatibility considerations for doing OLAR.
	Online Addition (OLA) Multiple cards can be added at the same time. When adding a
	card online, the first issue to resolve 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 there is available.

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