HyperFabric Administrator's Guide (HP-UX 11i v1)

Installing HyperFabric
Installing HyperFabric Adapters
Chapter 356
Online Replacement (OLR) When replacing an interface card online,
the replacement card must be identical to the card being replaced (or at
least be able to operate using the same driver as the replaced card). This
is referred to as like-for-like replacement and should be adhered to,
because using a similar but not identical card can cause unpredictable
results. For example, a newer version of the target card that is identical
to the older card in terms of hardware might contain an updated
firmware version that could potentially conflict with the current driver.
An A6092A adapter must be replaced with another A6092A adapter. An
A6386A adapter must be replaced with another A6386A adapter, etc.
Also, the old adapter and new adapter must have the same revision
levels.
When a replacement card is added to an HP 9000 system, the
appropriate driver for that card must be configured in the kernel before
beginning the replacement operation. SAM ensures the correct driver is
present. (In most cases, the replacement card will be the same type as a
card already in the system, and this requirement will be automatically
met.) Keep the following things in mind:
• If the necessary driver is not present and the driver is a dynamically
loadable kernel module (DLKM), it can be loaded manually. See the
“Dynamically Loadable Kernel Modules” section in “Configuring
HP-UX For Peripherals” for more information.
• If the driver is static and not configured in the kernel, then the card
cannot be added online. The card could be physically inserted online,
but no driver would claim it.
If there is any question about the driver’s presence, or if it is uncertain
that the replacement card is identical to the existing card, ioscan can be
used together with rad to investigate.
If more than one operational HyperFabric adapter is present when SAM
requests the suspend operation for all ports on the target adapter,
HyperFabric will redirect the target adapter’s traffic to a local backup
adapter using local failover. Client applications using the replaced
adapter will not be interrupted in any way.
If the adapter being replacing is active and it is the only operational
HyperFabric adapter on the HP 9000 system, SAM displays the following
warning message: