Sas Expansion Links; Type I Jbod Sas Expansion Configuration - Infortrend S12 Series Hardware Manual

SAS Expansion Links

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Depending on your RAID system, there are two types of JBOD SAS expansion
configurations.
RAID system using Type I expansion
For type I JBOD SAS expansion, please follow the instructions given in the following
section. For type II JBOD SAS expansion, please see instructions given here.

Type I JBOD SAS Expansion Configuration

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The SAS expansion port connects to expansion JBOD enclosures. For
dual-controller systems, each expansion port connects a RAID controller to a
corresponding JBOD controller making fault-tolerant links to different SAS domains.
There are two principles with the combinations of RAID and JBOD:

Dual-controller RAID connects to dual-controller JBODs; Single-controller
RAID connects to single-controller JBODs.

A maximum of 6 JBODs can be connected.

A longer cable is available for making expansion links with a dual-controller
configuration. A longer cable is required if connections to JBODs are made
from two opposite directions. Routing through two different connections can
avoid loss of data links if one enclosure fails in between.
EonStor / EonStor DS S12/S16/S24 Series
104
RAID system using Type II expansion