Intel JBOD 2000 Family, Руководство по оборудованию

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JBOD 2000 External SAS Connection Mode Overview Intel® Storage Server System JBOD 2000 Family Hardware Guide
Revision 1.42 48
7.5.3 Dual-path Connection
Dual-path means a host has redundant pathways to the storage device. When any part of the
data pathway to a SAS domain fails, data transfer will not stop. This is one advantage of dual-
path connection. Dual-path implementations cost less than dual-domain SAS implementations
but do not provide the full redundancy like a dual-domain SAS solution.
Figure 42 shows the dual external mini-SAS connectors of the SAS HBA or RAID adapter
connecting to JBOD 2000 with two mini-SAS cables. Each single controller port incorporates
four SAS lanes for a total maximum throughput of 2400MB/s with SAS 2.0 technology. SATA or
SAS hard drive can be supported. The SAS HBA or RAID adapter can handle either mini-SAS
cable disconnection and maintain the data transfer between the host and JBOD 2000.
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Figure 42. Dual-path Connection
7.5.4 Dual-path with Cascaded JBOD 2000
Dual-path to a single-domain provides tolerance of cable failure. Two single-port JBOD 2000
systems are cascaded with a mini-SAS cable between each “B PRI” SAS port, and a controller
connects to each “A PRI” SAS port with two mini-SAS cables. Any mini-SAS cable failure will
not stop the data transfer between the host and two JBOD 2000. Both SAS and SATA drives
support this configuration.
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Figure 43. Dual-path with Cascaded JBOD 2000