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Intel® Storage Server System JBOD 2000 Family Hardware Guide JBOD 2000 External SAS Connection Mode Overview
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7.6.3 Dual-domain SAS for Two-node Cluster
This configuration is also known as a failover cluster or high-availability cluster. A failover cluster
is a set of independent computers that work together to increase the availability of services and
applications. If one of the nodes fails, another node begins to provide service through a process
known as failover. A shared storage is needed in cluster configuration. In all clustered servers,
all elements of the storage stack should be identical.
In Figure 47, the connectors of the SAS controller in the first server connect to “A PRI” and “A
SEC” port on JBOD 2000 with two mini-SAS cables, and the connectors of the SAS controller in
the second server connect to “B PRI” and “B SEC” port on JBOD 2000 with other two mini-SAS
cables. The cluster interconnect provides redundancy in the event of HBA or cable failure. Dual-
domain SAS requires active/active configurations that permit both controllers to process IO
transfers. Either controller can act as a standby. To use the dual-ports for redundant pathways,
all drives must be SAS drives, not SATA drives.
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Figure 47. Dual-domain SAS for a Two-node Cluster
Figure 48 shows an example of external connection mode of two cascaded JBOD 2000 for a
failover cluster. Each server connects to two JBOD, which ensures the system can tolerate the
most HW failure in critical status.