
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 |
| 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 |
| 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 |
| card cannot require more power than there is available. |
Chapter 3 | 57 |