HP CommonIO Products Manual do Utilizador descarregar pdf (Página 101)

OLA/R Overview and Concepts

Planning and Preparation

Chapter 4 101

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.

• During the replacement process, the original driver instance runs in

a suspended state. I/O to the card is either queued or failed while the

card is suspended. When the replacement card is brought on-line, the

driver instance resumes normal operation. The driver instance must

be capable of resuming and controlling the replacement card.

• If the necessary driver is not present and the driver is a dynamically

loadable kernel module (DLKM), you can load it manually.

• If the driver is static and not configured in the kernel, then the card

cannot be On-line Added. The card could be physically inserted

on-line, but no driver would claim it.

Critical Resources

Replacing a card that is still operating can have extensive ramifications.

Since power to the slot must be off when the old card is removed and the

new card is inserted, the effects of shutting down the card’s functions

must be considered.

This is particularly important if there is no on-line failover or backup

card to pick up those functions. For example:

• Which mass storage devices will be temporarily disconnected when

the card is shut down?

• Will a critical networking connection be lost?

A critical resource is one that would cause a system crash or prevent the

operation from successfully completing if the resource were temporarily

suspended or disconnected. For example, if the SCSI adapter to be

replaced connects to the unmirrored root disk or swap space, the system

will crash when the card is shut down.

During an OLA/R 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 SMH performs a thorough critical resource analysis

automatically, and presents options to you based on it’s findings. If you

determine that critical resources will be affected by the procedure, you

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HP CommonIO Products Manual do Utilizador Página 101