To configure the expansion unit as a cluster when using the
Netfinity Fiber Channel RAID Controller:
1. Configure each bus independently.
2. Configure the expansion unit as a single 10-drive SCSI
channel.
Cable Restrictions
SCSI-3 compliant controllers (default to Low Voltage Differential
(LVD) signaling), can use any external cable length offered by IBM
in any clustered or nonclustered application. These adapters
include IBM ServeRAID 3 and Netfinity Fibre Channel RAID
Controller. SCSI-2 compliant controllers (Ultra SCSI or Fast SCSI
speeds using single ended (SE) signaling) are limited to less than or
equal to 2 meters of cable to operate at Ultra SCSI speeds (20 MHz
or 40 MB/sec), and less than 6 meters of cable to operate at Fast
SCSI speeds (10 MHz or 20 MB/sec). The speed setting is a setup
operation for a SCSI controller. Refer to your SCSI controller
documentation to set the appropriate speed.
Note: A SCSI channel from a SCSI controller must be dedicated to
the IBM Netfinity EXP15. This means that the corresponding
internal SCSI connector must be left unused.
Clustering Considerations
If IBM ServeRAID Controllers are used in a cluster configuration,
the term power LED on the rear of the expansion unit is useful
when servicing the cluster. The ServeRAID controller provides the
term power signal. If a term power LED is not on, it indicates that
a particular EXP15 expansion unit is not attached to a powered-on
controller. It is useful to know which external EXP15 expansion
unit is attached to which server when the hardware is being
serviced.
48
IBM Netfinity EXP15 Installation and User's Handbook
Summary of Contents for EXP15
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