Chapter 2 - Topologies and Operating Modes
Daisy-Chain JBOD Enclosures
34
Daisy-Chain JBOD Enclosures
Single Bus Dual-Loop Mode
The IRF-BOD enclosure is used as the daisy-chain enclosures to expand the
number of drives available to the imageRAID systems up to the limit of 96 disk
drives. The JBOD enclosure is configured as a Single Bus Dual-Loop system, where
the drive plane is a continuous 12 (twelve) drive single bus dual-loop FC-AL
configuration. The jumper, (JP3) on the Disk I/O card, should be offset (default
position) or installed on one pin only which enables this option. When enabled,
it also activates the internal hubs and provides the continuous FC loop.
Single Bus Dual-Loop JBOD Logical View - Daisy Chain Enclosures
Disk I/O Card
(Upper - Drive Loop 0)
Disk I/O Card
(Lower - Drive Loop 1)
P1
P2
P1
P2
PBC
PBC
PBC
PBC
Drive Slots 1 - 6
Drive Slots 7 - 12
Loop 0
Loop 1
Loop 0
Loop 1
imageRAID.book Page 34 Tuesday, September 23, 2003 4:08 PM
Summary of Contents for IRF-1D series
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