HP Surestore Disk Array 12h - And FC60 Service Manual page 191

using full-bus configuration, the even-numbered slots are assigned SCSI IDs 0 - 4, and
the odd-numbered slots are assigned IDs 8 - 12. (The gap in addresses is necessary for
internal management of enclosure components.) If the disk enclosure is configured for
split-bus operation, the both the even-numbered slots and the odd-numbered slots are
assigned IDs of 0 - 4.
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When viewing status information for the disk array, you may also see the disk
enclosure number and slot number displayed. These parameters identify the
physical location of the disk module within the disk array.
The disk enclosure number is assigned during installation using the disk enclosure ID
switches located on the rear of the enclosure. Each disk enclosure in the disk array must
have a unique enclosure ID number. Disk enclosures should be numbered from the top
down, with the enclosure mounted highest in the rack being 0.
The slot number indicates the physical enclosure slot in which the disk module is
installed. This number is related to, but is not the same as the disk SCSI ID. Slots are
assigned SCSI IDs differently depending on whether the disk enclosure is configured for
full or split bus operation as described above.
Figure 72 illustrates the four components involved in disk module addressing.
Managing Disk Array Capacity
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