Dot Hill Systems SANnet II 200, Installation, Operation And Service Manual

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4-22 SANnet II 200 SCSI Array Installation, Operation, and Service Manual • June 2005
Figure 4-26 Split-Bus Configuration With One Host and One Expansion Unit
4.10.2 Cabling to Two Expansion Units
The following figures are examples of configurations that have a RAID array
connected to two expansion units.
Caution –
A maximum of 16 drive IDs is allowed per channel. Therefore, in a 12-
drive array, do not connect a split-bus channel 0 or channel 2 (6 IDs) to a single-bus
expansion unit (12 IDs).
Note –
When you configure a host channel as a drive channel, the primary ID (PID) is
set to 8 and the secondary ID (SID) is set to 9. To avoid SCSI ID conflicts, change the
newly assigned drive channel PID to 6 and the SID to 7 using the firmware
application. For details, refer to the
SANnet II Family RAID Firmware User’s Guide .
Bus cable
Expansion cable
Host cable
Expansion unit
RAID array
Host server