EonStor DS S48 Series Hardware Manual
3.4.2
Configuration Rules
Following are the rules for connecting 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
Description
Designation
Description
1
RAID controller A
5
Dual-ported SAS drives
2
RAID controller B
6
Expander
3
JBOD controller A
7
To another JBOD
4
JBOD controller B
SAS hard drives feature dual port fault-tolerant links (the dual port
fault-tolerant capability is only viable in dual controller models).
SAS expansion cables will be available with Infortrend’s JBODs. Note
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