Product specifications

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Understanding SCSI Hardware
This section provides background information about the hardware
used to connect storage drives to the system. Information on hardware
preparation is included.
See ÒConnecting Storage DrivesÓ on page 151 for step-by-step
storage drive installation instructions.
Drive Configurations
Up to seven SCSI devices can be connected to a SiliconExpress IV
single-ended board. You can connect one MRS enclosure containing
four drives and a second MRS enclosure containing three additional
drives. The drives have SCSI IDs ranging from 0 to 6. Procedures are
provided later in this chapter.
Storage Expander Configurations
Storage expanders provide additional drive connections using
SiliconExpress 4D boards. Although each storage expander can be
linked to as many as seven drives, the system considers each storage
expander to be a single SCSI device. For example, chain two storage
expanders together and link them to a SiliconExpress 4D board, then
connect seven drives to each storage expander for a total of 14 drives.
Systems that include storage expanders require both differential and
single-ended SCSI hardware. Differential hardware links the storage
expanders to a SiliconExpress 4D board. Single-ended hardware links
the storage drives to each storage expander.