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SC417J Chassis Manual
E-6
Figure E-8: External Cables for Connecting Head Units to JBODs
Figure E-9: Using a RAID/HBA Card and Expander to Connect Downstream
SMCI confidential document 7 Whitepaper
The RAID card in the head unit can cascade to the JBOD chassis either thru its own
expanders or thru its own external SFF 8088 connector. SMCI’s AOC-SAS2LP-H4iR has
one external connector for this purpose (i.e. Section 3.2 ). Block diagrams of the head
unit to JBOD chassis connectivity combinations are in sections 3.1 and 3.2 below but
there are many combinations which you could connect a head unit to downstream JBODs
however I have covered the popular ones.
Section 3.1 – Using RAID/HBA card to connect downstream
Below is block diagram of how a head unit could be cascaded to a downstream JBOD
chassis which in our case is SC847E16. Here each of the backplanes in the JBOD unit is
connected to separate connectors on the RAID card in the head unit.
Section 3.2
– Using RAID/HBA card and expander to connect downstream
Picture of two external connectors from
host’s HBA/RAID to JBOD – Parallel
Figure 8
External cables used to connect Head
units and JBODs to each other
Figure 7
Head unit
DA Backplane
RAID card
SC847E16 JBOD chassis
SFF 8088 by four
CBL-0166
CBL-0166
Downstream
The RAID card in the head unit can cascade to the JBOD chassis either through
its own expanders or through its own external CBL-0386L connector. Supermicro’s
AOC-SAS2LP-H4iR has one external connector for this purpose. See the Using a
RAID/HBA Card to Connect Downstream section below. Block diagrams of the head
unit to JBOD chassis connectivity combinations are in this section and in the follow-
ing section titled, Using a RAID/HBA Card and Expander to Connect Downstream.
Of the many possible combinations to connect a head unit to downstream JBODs,
these two are the most popular.
Using a RAID/HBA Card To Connect Downstream
Below is block diagram of how a head unit may be cascaded to a SC417J E16 JBOD
chassis downstream. In this example, each of the backplanes in the JBOD unit are
connected to separate connectors on the RAID card in the head unit.