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Chapter 4: Connection and Operation
Chapter 4
System Connection and Operation
This chapter introduces sample topologies, configuration options and server
connections for the EonStor subsystems and discusses both the power on and power
off procedures.
4.1 SCSI Connection Overview
The EonStor A12U and A08U subsystems support 2 SCSI host channels and 2 dual-
stack connectors featuring support for SCSI-320 protocol (also known as Ultra-320),
the latest iteration of the SCSI drive interface standard. The SCSI-320 enables
maximum data transfer rates up to 320MB/second per channel from host computers
to the subsystems or expansion systems. This is twice the bandwidth as the Ultra160
standard, allowing you optimal performance and flexibility with configuring storage
applications.
4.1.1 SCSI Cables
One SCSI cable (IFT-9270UJBODCab) is provided with each subsystem for host
connection. If you wish to connect the second host channel, a second cable must be
separately purchased. Purchase only high quality SCSI-320 cables from a reputable
manufacturer. To ensure optimum performance, it is necessary to use proper, high
quality SCSI-320 compatible cables. Failure to do so will result in downgraded
performance.
4.1.2 SCSI Port on the Controller Rear Panel
The SATA-based subsystems are equipped with two dual-stack VHDCI connectors
on the back of the enclosure. (See Figure 4- 1) Each 68-pin VHDCI connector is
specified as “Channel # In” or “Channel # Out” port.
SCSI Connection Overview
4-1