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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
• 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
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