Seagate ST3300007LW Guía de usuario descargar pdf (Pagina 34)

SCSI Bus Termination with SCSI Hammer™

Working with SCSI devices requires the use of SCSI bus termination to ensure the integrity

of data signals being sent along the SCSI bus. Improper termination of the SCSI chain may

result in unpredictable responses from SCSI Hammer™ including scan bus timeouts and

misreading of hard drive information. This overview of SCSI bus termination with SCSI

Hammer™ is not meant to be an exhaustive representation of SCSI termination, but rather

a quick guide for properly terminating with SCSI Hammer™ and tips and warnings about

problematic termination situations.

A SCSI chain is defined as a series of SCSI devices connected to a SCSI bus usually through

a SCSI cable or a SCSI hard drive enclosure.

SCSI Hammer™ Users Guide

Page 34 of 89

SCSI Hammer™ is capable of controlling two separate

SCSI chains simultaneously, one on each ‘Side’ of the

device. It is important to note that the 50 pin connector

and 68 pin connector on each ‘Side’ are a part of the same

SCSI chain.

Hard drives may be connected to ‘Side A’ using the 50 pin

connector while connecting other hard drives to the 68 pin

connector on ‘Side B’ (or vice versa) since they are using separate chains. It is a good

practice to only have one SCSI cable attached per side.

SCSI Hammer™ Tips:

Avoid connecting hard drives to

both the 50 pin connector and

the 68 pin connector on the same

side (same SCSI chain)

simultaneously.

Since a SCSI chain is comprised of a series of SCSI devices along the bus, SCSI

specifications require a terminator on each end of the SCSI chain.

SCSI Hammer™ will always be on one end of the SCSI chain and it comes with built in

termination. To ensure predictable and consistent behavior, users of SCSI Hammer™ must

ensure that the other end of the SCSI chain has been properly terminated.

SCSI Hammer™ ships with:

• Two (2) 68 Pin SCSI Cables

• Two (2) 50 Pin SCSI Cables

• Two (2) 68 Pin Terminators

• Two (2) 50 Pin Terminators

Properly terminating the SCSI chain usually means making sure a SCSI cable has a

terminator at the last possible connector on the SCSI cable. More precisely, one end of a

cable should be connected to SCSI Hammer™ which will terminate the ‘near’ end of the

SCSI chain; the intermediate connectors should be connected to SCSI hard drives, with the

final connector (‘far end’) attached to a terminator. There are at least two likely exceptions

to this general rule.

SCSI Hammer™ Tips:

It is usually simpler for the

system (the cable) to handle the

termination, as this requires less

attention to the order of the

drives connected.

1. Some SCSI hard drives can be set, using

jumpers, to terminate the SCSI Chain. If this is

done properly, a separate terminator is not

required. In this case, the drive which is last in

the chain (‘far side’) should be set to terminate

the chain.

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 88 89

Comentarios a estos manuales

Sin comentarios

Seagate ST3300007LW Guía de usuario Pagina 34

Comentarios a estos manuales

Relacionado con productos y manuales para Las licencias de software / actualizaciones Seagate ST3300007LW