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External RAID Controller Operation Overview

4-56 GAM Client v3.00 and WSAM User’s Manual

External RAID Controller Operation Overview

External RAID Controllers use their host ports to connect to one or more

Host Bus Adapters in one or more host computer systems.

Depending on the model and configuration of the controller, there may be

from one to four host ports. Each configured logical drive consumes a

particular bus-target ID-LUN on the host system. Multiple sets of disk drives

are connected to the controller via its drive channels. There may be as many

as six drive channels, depending on the controller model and configuration.

In duplex, or Active/Active mode, two identical External RAID Controllers

are connected to the same hosts via their host ports, to the same drives via

their drive channels, and to each other via a special hardware link for

heartbeat sensing. This forms a redundant controller system. The two

controllers work together handling data traffic and mirror their write data in

each other’s cache memory. If one of the controllers fails or otherwise

becomes non-operational, the surviving controller takes over its

responsibilities with no loss of data.

☛ Note

This section presents only a brief introduction to

External RAID Controller operation. For additional

details, consult the hardware installation guide for the

particular controller of interest.

Two schemes for LUN Mapping exist depending on the version of the

External RAID Controller firmware in use:

• External Firmware 5.x and below uses a basic LUN Mapping system.

• External Firmware 6.x and above uses an advanced “Host-to-LUN

Mapping” system.

Refer to the appropriate section(s) to follow.

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Mylex eXtremeRAID Guia de Instalação Página 106