Configuration Rules - Infortrend EonStor GS 3000 Series Hardware Manual

Configuration Rules

How to connect SAS interfaces across RAID and JBOD enclosures:

Fault-tolerant links in a Dual-Controller combinations: Corresponding to SAS
drives' dual-ported interface, two physical links are available from each disk
drive, routed across the backplane board, each through a SAS expander,
and then interfaced through a 4x wide external SAS port.

With data paths through separate SAS domains, access to disk drives can
be continued in the event of a cable link or SAS JBOD controller failure.
Designation
1
2
3
4

Fault-tolerant Links to SAS disk Drives

SAS expansion cables will be available with the JBODs. Note that if many
JBODs are connected, a longer SAS external cable (e.g., a 120cm cable)
may be necessary for connecting a JBOD from the opposite direction
offering high redundancy.
Description
RAID controller A
RAID controller B
JBOD controller A
JBOD controller B
76
Designation Description
Dual-ported SAS drives
5
6 Expander
7 To another JBOD