HP A4800A User Manual download pdf (Page 28)

Installing the A4800A Adapter

Terminating the A4800A Adapter

Chapter 228

Terminating the A4800A Adapter

The A4800A has no auto-termination setting. Termination must be

provided by a physical terminator. When the HBA is at the end of the

SCSI bus, the terminator should be installed and secured at either the

internal or external connector (whichever does not have a cable attached)

as shown in Figure 1-1 on page 8.

When the adapter is used in High-Availability (HA) applications (such as

MC/ServiceGuard) and it is required to be in the middle of the bus, the

adapter’s terminator must be removed.

The SCSI bus must be properly terminated. Terminators may be ordered

separately if needed (When ordered with the HBA, the part number is

A4800A option 2. When ordered separately, the part number is C2905A).

The ﬁrst and last physical SCSI devices connected on the ends of the

SCSI bus must have terminators attached. All other SCSI devices on the

SCSI bus must have their terminators removed or disabled. Note that

the host bus adapter is also on the bus.

IMPORTANT The A4800A does not provide automatic termination.

NOTE When the adapter is used in HA applications that use two SCSI host bus

adapters (such as MC/ServiceGuard) and it is required to be in the

middle of the bus, the adapter’s SCSI ID will need to be changed (for

example, from 7 to 6). Each device on the bus must have a unique ID.

Refer to “The SCSI Command” on page 37.

To disable the adapter’s termination, you need to physically remove the

terminator from the HBA connector. Termination for this bus must now

be provided by some other SCSI device (e.g. disk, disk array, or other

HBA, as required).

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HP A4800A User Manual Page 28