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Card Compatibility
On-Line Addition (OLA).
When on-line adding an interface card, the first issue that must be
resolved 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 is available.
The card must also operate at the slot's bus frequency. A PCI card must
run at any frequency lower than its maximum capability, but a card that
could only operate at 33 MHz would not work on a bus running at 66
MHz. rad provides information about the bus frequency and power
available at a slot, as well as other slot-related data.
On-Line Replacement (OLR)
When on-line replacing an interface card, 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 may cause unpredictable results. For example, a newer
version of the target card which is identical in terms of hardware may
contain an updated firmware version that could potentially conflict with
the current driver.
The PCI specification allows a single physical card to contain more than
one port. A single-port SCSI bus adapter can not be replaced by a
dual-port adapter, even if the additional port(s) on the card are identical
to the original SCSI bus adapter.
When the replacement card is added to the system, the appropriate
driver for that card must be configured in the kernel before beginning
the 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.) If you have any
question about the driver's presence, or if you are not certain that the
replacement card is identical to the existing card, you can use ioscan
together with rad to investigate.
• If the necessary driver is not present and the driver is a dynamically
loadable kernel module (DLKM), you can load it manually. Refer to
the section Dynamically Loadable Kernel Modules in Chapter 2 of the
document: Configuring HP-UX For Peripherals, HP Part Number
B2355-90698 for more information.
Chapter 2
On Line Addition and/or Replacement (OLAR)
Introduction
21
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