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S e r v i c e I n f o r m a t i o n
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:
1
2
3
Figure 4-37 Removable Media SCSI Interface Board
1.
SCSI Connector
2
Interface Board
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.
4-38 OWNER'S HANDBOOK
ENABLE
3.
Jumper J1
4.
Jumper J2
DISABLE
4
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