EonStor DS B12/B24 Series
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Expansion Links
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.
An alternate lengthier 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.
Please contact your vendor for details.
JBODs and Corresponding RAID Systems
RAID Models
JBOD
Configuration
B12x-G1xxx series
B12S-J1000-S
B12x-G2xxx series
B12S-J2000-G
B24x-G2xxx series
S12F-G2850 & S12E-G2251
B24S-J2000-S
Single-controller; single path
B12x-R1xxx series
B12S-J1000-R
B12x-R2xxx series
B12S-J2000-R
B24x-R2xxx series
S12F-R2850 & S12E-R2251
B24S-J2000-R
Dual-controller; fault-tolerant paths
There is a rotary ID switch on every expansion enclosure that is manually configured
using a flat blade screwdriver.
NOTE:
The highlighted columns above are systems described in another manual. Please
refer to their respective manuals for details as only their JBOD related connections
will be described here.
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