Installation guide

Chapter 2. Hardware Installation and Operating System Configuration 17
Hardware Quantity Description Required
External
disk storage
enclosure
At least one Use Fibre Channel or single-initiator
parallel SCSI to connect the cluster nodes
to a single or dual-controller RAID array.
To use single-initiator buses, a RAID
controller must have multiple host ports
and provide simultaneous access to all
the logical units on the host ports. To use
a dual-controller RAID array, a logical
unit must fail over from one controller to
the other in a way that is transparent to
the operating system.
SCSI RAID arrays that provide
simultaneous access to all logical units on
the host ports are recommended.
To ensure symmetry of device IDs and
LUNs, many RAID arrays with dual
redundant controllers must be configured
in an active/passive mode.
Refer to
Appendix A Supplementary Hardware Information
for more information.
Yes
SCSI cable One per
node
SCSI cables with 68 pins connect each
host bus adapter to a storage enclosure
port. Cables have either HD68 or VHDCI
connectors. Cables vary based on adapter
type.
Only for
parallel
SCSI config-
urations
SCSI
terminator
As required
by hardware
configura-
tion
For a RAID storage enclosure that uses
"out" ports (such as FlashDisk RAID Disk
Array) and is connected to single-initiator
SCSI buses, connect terminators to the
"out" ports to terminate the buses.
Only for
parallel
SCSI config-
urations and
only as
necessary
for
termination
Fibre
Channel hub
or switch
One or two A Fibre Channel hub or switch may be
required.
Only for
some Fibre
Channel
configura-
tions