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

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B-8 SANnet II 200 SCSI Array Installation, Operation, and Service Manual • June 2005
Figure B-4 Dual-Host, Split-Bus Multi-Initiator JBOD Configuration
In this configuration, the split-bus, multi-initiator mode creates physical drive IDs 0 to
5 on each channel as shown in Table B-4.
To connect a split-bus JBOD to two hosts, perform the following steps.
1. Stop any I/O on the host bus that will have a cable installed on the bus.
2. Connect each JBOD port to a host as shown in Figure B-4.
The lower input ports of the JBOD must have a host connection or external terminator
to maintain SCSI bus integrity.
Note –
Before you disconnect a cable from the array, the host bus on that cable must
be inactive.
Caution –
Physical drive IDs are set based on the cabling on the array when it is
powered up. If you are switching from single-bus mode to split-bus mode or from
split-bus mode to single-bus mode, the physical drive IDs change after you power off,
change the cabling, and then power on. If you change physical drive IDs on the array,
ensure that your application points to the correct IDs.
Table B-4 Physical Drive IDs for a Split-Bus JBOD in Multi-Initiator Mode
Channel A ID 0 Channel A ID 3 Channel B ID 0 Channel B ID 3
Channel A ID 1 Channel A ID 4 Channel B ID 1 Channel B ID 4
Channel A ID 2 Channel A ID 5 Channel B ID 2 Channel B ID 5
Host B Host A
IDs: 0-5 IDs: 0-5