S e r v i c e I n f o r m a t i o n
4-38 OWNER’S HANDBOOK
Jumper Settings for the Removable Media SCSI Interface Board
Each module backplane contains a removable media SCSI interface board,
positioned at the top of the module. However, only one of the boards, the
one in module B, is ever attached to the removable media SCSI cable.
There are two jumpers on the interface board, as shown in the following
diagram:
ENABLE
DISABLE
2
1
4
3
Figure 4-37 Removable Media SCSI Interface Board
1.
SCSI Connector
3.
Jumper J1
2
Interface Board
4.
Jumper J2
Both jumpers, J1 and J2, must be in the correct positions for the system to
work properly, according to the following instructions:
♦
J1 determines whether a
delayed spinup
occurs in this module.
Delayed spinup means that the installed drives will not start
spinning simultaneously after you switch the server on. Instead, the
drives start one at a time with a specific number of seconds between
each one. This delay prevents the excessive power drain that would
otherwise occur if all drives started at the same instant. Therefore,
this jumper should always be in the
enabled
position.
♦
J2 determines where the SCSI bus terminates. If the removable
media drive SCSI cable is connected to this interface board, set this
jumper to the
enabled
position. Otherwise, set it to the disabled
position.
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