Daisy Chaining Scsi Devices; Ultrascsi; Fast Wide Or Narrow Scsi Buses - Sun Microsystems StorEdge MultiPack Series User Manual

Daisy Chaining SCSI Devices

More than one six-drive Sun StorEdge MultiPack enclosure can be connected to a
single wide SCSI bus, provided enough target addresses remain for use. If two six-
disk enclosures are chained on one wide SCSI bus, one must be set for the 9-14
addresses and the other for the 1-6 addresses.
Caution – Chaining more than one Sun StorEdge MultiPack enclosure on a single
bus causes both units to operate at less than UltraSCSCI speeds.
Refer to the Sun StorEdge MultiPack Installation instructions for illustrations and more
information about chaining.

UltraSCSI

One Sun StorEdge MultiPack six-drive unit may be attached to the host port of a
host interface or to a host adapter. If you connect your Sun StorEdge MultiPack
enclosure to the on-board host port of your computer, you can use only a .8 meter
cable. You can use a 2-meter cable if you connect it to a host adapter. Do not use an
external terminator.
Caution – Chaining other external SCSI devices at any point in the chain with the
Sun StorEdge MultiPack enclosure causes the Sun StorEdge MultiPack to operate at
less than UltraSCSI speed.

Fast Wide or Narrow SCSI Buses

You can daisy-chain the Sun StorEdge MultiPack unit with tape or CD-ROM devices
if you do not exceed the number of host ID addresses available. Narrow SCSI hosts
have only seven SCSI ID addresses available and must include internal disks.
Caution – Be sure you have no conflicting SCSI ID addresses. See the Solaris
Handbook for SMCC Peripherals for more information about determining addresses.
Chapter 1 Installation Considerations 23