Data General AViiON 4600 Series, Customer Documentation

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Adding or Replacing Internal Mass–Storage Devices
7-7
014–002091
If you removed a failed drive, insert it in an antistatic bag and return it to Data
General. Contact Data General, as described in the Preface, for information on
returning the faulty part.
To install a replacement drive, go to the next section, Configuring New or
Replacement Drives "
Configuring New or Replacement Drives
Before you install a new or replacement drive in your system, you must configure the
drive to cooperate with your other system components. In particular, you need to set
the operating parameters for your SCSI drives to function properly with other devices
on the SCSI bus. Once you have confirmed (after referring to Chapters 6 and 4 in this
manual) that your new drive adheres to the SCSI and power rules for your entire
system, you must set the appropriate jumpers and/or switches on the new or
replacement drives as described in this section.
NOTE: For information on how to access the SCSI jumpers/switches and the
terminator resistors, refer to the manual on installing the drive listed in
Guide to AViiON

and DG/UX

Systems Documentation .
Configure the new or replacement drive as follows:
• On the disks, set the spindle control option jumpers or switches for sequential drive
motor start. The drive will then delay starting up its spindle motor a number of
seconds (a multiple of the SCSI ID number) when you power up your system.
• Set the appropriate jumpers or switches for the SCSI bus (host system) to provide
terminator power rather than the drive itself. Some devices specify this option as
SCSI pin 26 ON," or power from interface cable pin 26."
• Set the jumpers or switches to enable parity checking and arbitration if the drive
offers these options.
•
Make sure the bus termination is correct on the new drive. In an AViiON 530 or
4600 series computer,
all the internal drives and SCSI adapter boards must have
their SCSI bus terminator resistors removed .
•
Set the SCSI ID jumpers or switches on the new drive or SCSI adapter board to the
device ID you assigned it when you planned your SCSI bus. Table 7Ć2 reviews the
device identification sequence we recommend; Figure 7Ć7 shows an example of a
valid SCSI bus configuration.
NOTE: You should review or complete the SCSI Bus Configuration Worksheet in
Chapter 4 to see if any external SCSI drive or SCSI adapter board on the first
(connector A") bus has the same SCSI ID as the internal drive or SCSI
adapter board you intend to add. If any external device on the bus has the
same SCSI ID as an internal drive or SCSI adapter board, you must reassign
your SCSI IDs for one of the devices.