Infortrend RAID Controller Manual

12-10
F. Considerations with Redundant Controllers
� SCSI Termination:
For the SentinelRAID series in redundant mode, the on-board
terminators should be hardware-enabled by jumper switches.
Integrators may apply external terminators at both ends of a
SCSI bus or choose to enable the on-board terminators on the
controller I/O backplane. The precaution is that, terminators
must be "hardware-enabled" via jumper switches rather than
"firmware-enabled." Although terminators can be activated via
firmware settings, firmware control is lost when a controller
fails. Settings via firmware will result in SCSI bus failure
because every channel is connected between controllers.
For the 3101 and 3102 series, external terminators should be
applied instead. Please refer to the Hardware Manual for details.
� Connection:
The channels of the two controllers that are connected together
must be the same. For example, if controller 1 uses channel 2 to
connect a group of drives, controller 2 must also use channel 2
to connect to the drive group.
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