Compaq External RAID Controller & Subsystem Manual do Utilizador descarregar pdf (Página 223)

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Table 10 - 1 ID Mapping Status (Normal Operation)

Channel ID Status Target Chip

(Primary ID)

Active Pri. Controller

channel 0

(Secondary ID)

Standby Sec. Controller

channel 0

(Secondary ID)

Active Sec. Controller

channel 1

(Primary ID)

Standby Pri. Controller

channel 1

In the event of controller failure (say, the Primary controller fails), the

once inactive ID (chip) will become active:

Table 10 - 2 ID Mapping Status (Controller Failed)

Channel ID Status Target Chip

(Primary ID)

Active

Pri. Controller

channel 0

– Failed!

(Secondary ID)

Standby- becomes

Active!

Sec. Controller

channel 0

(Secondary ID)

Active Sec. Controller

channel 1

(Primary ID)

Standby

Pri. Controller

channel 1-

Failed!

Figure 10 - 8 Controller Failover

For every channel that is actively serving I/Os, there is another on the

alternate controller that stays idle and will inherit the task should its

counterpart fail.

An exception to this is that active IDs may co-exist on single or

multiple host channels. As long as I/O bandwidth is not of the

concern, then standby chips may not be necessary.

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