Dot Hill Systems SANnet II 200, Инструкция по установке, эксплуатации и обслуживанию

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4-10 SANnet II 200 SCSI Array Installation, Operation, and Service Manual • June 2005
4.6 Single-Bus and Split-Bus Configurations
The drive-bus configuration determines how drives and drive IDs are assigned to drive
channels on the controller.
A single-bus configuration assigns all disk drive IDs in a controller to one channel
(typically CH 0 for the RAID array and CH 2 for an expansion unit).
A split-bus configuration assigns half the disk drive IDs to CH 0 and the other half to
CH 2 in the RAID array, and then typically adds more disk drive IDs to both CH 0 and
CH 2 when it is connected to an expansion unit.
Each drive channel can have up to 16 IDs (0 to 15); ID 6 and ID 7 are reserved for
internal connections.
On the back panel of each RAID array on the I/O module, the SB icon is displayed
next to the CH 0 port and the SCSI SNGL BUS CONF port to indicate where to
connect the SCSI jumper cable for a single-bus configuration.
Similarly, the DB icon is displayed next to the CH 2 port and the split-bus CONF port
to indicate where to connect the SCSI jumper cable for a split-bus configuration.
Figure 4-7 Single-Bus and Split-Bus Icons
On the back panel of each expansion unit, the SB icon indicates where to connect the
jumper cable for a single-bus configuration.
The physical drive IDs are also displayed on the lower inside-front edge of the chassis.
These IDs are automatically assigned and appear in the RAID controller status tables.
Figure 4-8 Disk Drive IDs Displayed Inside the Lower Edge of the Chassis
= Single-bus configuration
= Split-bus configuration (formerly known as dual-bus)