Scsi Bus Topology - HP Surestore Disk Array 12h - And FC60 Service Manual

Hp surestore e disk array 12h user's and service manual (c5445-90901, september 1999)
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Concepts and Management
Disk Array Hardware

SCSI Bus Topology

The array controller communicates externally with the host over a fast-wide, differential SCSI bus. Each
array controller is addressed by the host as a separate SCSI target; therefore, they must each have different
addresses if they are connected to the same SCSI bus. The array controller SCSI address and all other SCSI
operating parameters are set programmatically from the control panel on the disk array enclosure, or using
the host software utility. There are no hardware jumpers on the array controller.
Internally, the array controller communicates with the disks over four separate single-ended (SE) SCSI
buses. Disk SCSI addresses and all other operating parameters are set internally by the disk array
controller. There are no hardware jumpers on the disk modules.
To ensure optimum performance, the disk modules should be distributed equally across the internal SCSI
busses. This is accomplished by simply making sure the disk modules are installed in the enclosure in the
correct order—left-to-right, top-to-bottom. Overloading one or two of the internal SCSI busses can impact
throughput and decrease performance.
Figure 24. SCSI Bus Details
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