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MegaRUM PCI Motherboard User’s Guide40
Step 11 Connect SCSI I/O, Continued
SCSI Termination Possibilities
SCSI
terminator
Termination on controller
disabled
Termination on controller
enabled
SCSI devices
(termination disabled on both)
Setup using one connector for one channel
Setup using two connectors for one channel
SCSI devices
(termination disabled on both)
SCSI devices
(termination disabled on both)
SCSI
terminator
SCSI
terminator
Termination on
motherboard
enabled.
Termination on
motherboard
disabled.
If the MegaRUM is at one end of a cable, it sets termination automatically at
that end. Otherwise, MegaRUM disables its own termination and you must set
termination at the cable ends. If another connector on MegaRUM is also used
for the same channel, the termination on MegaRUM is disabled automatically
and termination should be set on the device at the farthest end of the cable.
For a disk array, set SCSI bus termination so that removing or adding a SCSI
device does not disturb termination. An easy way to do this is to connect
MegaRUM at one end of the SCSI cable for each channel and to connect an
external terminator module at the other end of each cable. The connectors
between the two ends can connect SCSI devices. Disable termination on the
SCSI devices. See the manual for each SCSI device to disable termination.
Selecting a SCSI Terminator Use ALT-2 type external SCSI terminators on SCSI channels
operating at 10 MBs or higher synchronous data transfer.
Cont’d