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Interface Card OL* Support Guide: HP-UX 11i v2 > Chapter 1 PCI Card OL* Overview and Concepts
Important Considerations |
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This section presents other situations that you are likely to encounter when performing OL* operations, and how to handle them accordingly: A power domain is a grouping of 1 or more interface card slots that are powered on or off as a unit. As of this release, there are no systems that support more than 1 interface card slot in a single power domain. An OL* action using pdweb will not be allowed to take place for a card if any member of its power domain is a critical resource. Some PCI cards may provide more than one function. These multi-port cards have separate hardware paths for each port, as well as separate drivers bound at each hardware path. An OL* action will not be allowed to take place for a card if any port is a critical resource. Some driver designs create “virtual” ports that do not directly correspond to any physical hardware. Virtual ports can normally be identified by the driver that controls them. For example, HP Fibrechannel Mass Storage card drivers create virtual ports with drivers named fcp, fcpdev, fcparray, and fcpmux to control different aspects of the fibrechannel mass storage network to which they are attached. The pdweb GUI does not explicitly list virtual ports when discussing topics that affect physical ports, however both types of ports are suspended and resumed as appropriate. Since virtual ports are reported by ioscan, they will appear with the same slot ID as their corresponding physical port. For those wishing to use OL*, your system may need to update its firmware. For additional details, please refer to the Read Before Installing or Updating to HP-UX 11i document provided with your HP product. Slots which share the same PCI or PCI-X bus are considered shared slots. The behavior of an OL* operation on a shared slot will depend on the state of the bus which depends on whether cards are already on the other shared slots of the bus.
The following example would fail.
Table 1-2 Frequency Matching Scenarios for Shared Slots
The card must also operate at the slot’s bus frequency. A PCI card can run at a frequency lower than its maximum capability. A card added that has a higher frequency than the slot will run at the slower slot speed. Cards with a slower frequency may not be able to be installed in a slot with a higher frequency. The pdweb tool provides information about the bus frequency and power available as well as other slot-related data. The following table shows the consequences of installing a card into a slot with different frequencies. Table 1-3 Installing Card into a Slot with a Different Frequency
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