Mylex AcceleRAID 170, Installation Manual

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Installation
Manual No. 775064 2-13
2.
Termination - Both Internal and External Devices
Check that the drive channel is properly terminated according to the
drawing below.
If the controller is in the middle of the SCSI bus, it automatically
disables on-board termination. If some SCSI devices on the channel are
connected to the internal connector, and some are connected to the
external connector, on the same channel, the two ends of the SCSI bus
farthest from the controller must each be terminated.
See Figure 2-11 for an example of a combined internal and external
drive configuration. Notice that they are on the same channel.
☛
Note
It is better to terminate the ends of the SCSI bus itself
than it is to terminate the end devices on the bus. This
allows hot swap devices to be added or removed from
the SCSI bus without affecting termination.
☛
Note
The only devices controlled by the RAID
configuration are the ones physically
connected to the AcceleRAID 170 controller.
Figure 2-11. Termination with Internal and External Drive Configuration
3. Remove or set disk drive termination jumpers to the disabled position
(if needed). Refer to the documentation furnished with your disk drives
to determine if your termination jumpers need to be adjusted.