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

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4-14 SANnet II 200 SCSI Array Installation, Operation, and Service Manual • June 2005
Figure 4-13 Expansion Unit: Single-Bus Configuration, Default IDs
The IDs are also displayed on the lower inside-front edge of the chassis. These IDs are
automatically assigned and appear in RAID controller status tables.
4. Connect your RAID array (SCSI channel 1 and 3 ports) to one or two host servers with
SCSI cables.
SCSI ports for channels 1 and 3 are assigned as host channels by default.
4.8 Connecting Cables for a Split-Bus
Configuration
A split-bus configuration assigns half the disk drives to one channel and the other to
the second channel. This configuration can be helpful when you want to use one set of
drives to mirror the second set with drives configured as RAID 1 drives.
1. To create a split-bus configuration on a RAID array, use the SCSI jumper cable to
connect the CH 2 port to the split-bus (formerly known as the dual-bus) CONF port.
Tighten the cable jack screws with six full clockwise turns to ensure proper connection
and operation.
Six IDs are assigned to CH 0, and six IDs are assigned to CH 2 in a 12-drive array.
Figure 4-14 RAID Split-Bus Configuration
In the split-bus expansion unit configuration, no jumper cable is required.
Disk 0 - CH2 - ID0
Disk 1 - CH2 - ID1
Disk 2 - CH2 - ID2
Disk 3 - CH2 - ID3
Disk 4 - CH2 - ID4
Disk 5 - CH2 - ID5
Disk 6 - CH2 - ID8
Disk 7 - CH2 - ID9
Disk 8 - CH2 - ID10
Disk 9 - CH2 - ID11
Disk 10 - CH2 - ID12
Disk 11 - CH2 - ID13