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Installing the A6828A Adapter

Specifying SCSI Parameters

Chapter 2 27

Maximum Data Transfer Rate

The ﬁrmware suggested default for the A6828A adapter’s maximum data

transfer rate is the adapter’s maximum speed (160 MB/s). The A6828A

can communicate with all LVD or SE devices that have speeds up to 160

MB/s. This includes the following speeds (synchronous communication

over a Wide bus):

• Fast (20 MB/s)

• Ultra (40 MB/s)

• Ultra2 (80 MB/s)

• Ultra160 (160 MB/s)

The actual transfer rate between the adapter and a SCSI device depends

on the transfer rate that was negotiated between the adapter and the

SCSI device. However, the actual rate will never be greater than the

maximum data transfer rate set for the adapter.

For example, if you set the A6828A’s maximum data transfer rate to

NOLIMIT (which is same as 160 MB/s, in this case), and then connect a

disk drive that has a maximum data transfer rate of Ultra2 (80 MB/s),

the actual transfer rate will be 80 MB/s.

TIP HP recommends that you always set the A6828A’s maximum data

transfer rate to MAX or NOLIMIT (whichever is applicable to the system),

unless you are trying to debug a communication problem between the

adapter and a speciﬁc SCSI device. Using MAX or NOLIMIT allows the

adapter’s maximum transfer rate (160 MB/s) to be used.

You can set the A6828A’s maximum data transfer rate in two ways, as

shown in Table 2-2 on page 22.

To set the maximum data transfer rate for A6828A HBA installed in

PA-RISC based system, see “Setting Maximum Data Transfer Rate for

A6828A Host Bus Adapter Installed in PA-RISC Based System” on

page 28.

To set the maximum data transfer rate for A6828A HBA installed in

Itanium-based system, see “Setting Maximum Data Transfer Rate for

A6828A Host Bus Adapter Installed in Itanium‚-Based System” on

page 32.

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HP A6828A Manual do Utilizador Página 43