Daisy-Chain Jbod Enclosures; Single Bus Dual-Loop Mode - NexStor 4900F Series User Manual

Chapter 2 - Topologies and Operating Modes

Daisy-Chain JBOD Enclosures

Single Bus Dual-Loop Mode

The NexStor 4000F JBOD enclosure is used as the daisy-chain enclosures to
expand the number of drives available to the NexStor 4900F Series Storage 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.
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Daisy-Chain JBOD Enclosures
Disk I/O Card
(Upper - Drive Loop 0)
P1 PBC
P2 PBC
P1 PBC
P2 PBC
Disk I/O Card
(Lower - Drive Loop 1)
Single Bus Dual-Loop JBOD Logical View - Daisy Chain Enclosures
Drive Slots 7 - 12
Drive Slots 1 - 6
Loop 0
Loop 1
Loop 0
Loop 1