Disk Slot Numbers; Scsi Connections - Sun Microsystems StorEdge D2 Array Installation, Operation And Service Manual

TABLE 1-6
the number of ESMs, and the SCSI IDs for the disk in both single-bus and split-bus
configurations.
TABLE 1-6
Switch 1 Configuration
Up Single-bus, single ESM (in
position 0)
Down Split-bus, two ESMs (in
position 0 and position 1)
1.7.1.2

Disk Slot Numbers

The disk slot numbers are used by the SAF-TE commands to communicate with the
disks. In single-bus configuration, the disk slot numbers are 0 through 5 and 8
through 13. In split-bus configuration, the disk slot numbers are 0 through 5 for ESM
0 and 0 through 5 for ESM 1 because each ESM can only communicate with the six
drives associated with that ESM.
1.7.1.3

SCSI Connections

Each ESM has two independent Ultra3 SCSI bus connectors. Each ESM must be
connected by at least one SCSI cable to at least one host.
The number and configuration of the host-to-array connections depends on your
site's storage needs. See "Supported Configurations" on page 1-19.
If the cables needed for your configuration were not ordered with the Sun StorEdge
D2 Array, contact your Sun sales representative. See the Sun StorEdge D2 Array
Release Notes for the list of supported cables.
The ESM has internal terminators for each SCSI bus connector. No external
terminators are required. Daisy-chaining from one ESM to another is not supported.
Only point-to-point SCSI connections from the host to the ESM are allowed.
The maximum SCSI bus length is 12 meters. Besides the length of the cables you use
when connecting to the host, take into account the bus length of .051 meters within
the ESM.
summarizes the relationship between the setting of switch 1 on the ESM,
Summary of Switch 1 Settings and Disk SCSI IDs
Left Disk Bank SCSI ID Numbers
0, 1, 2, 3, 4, 5
8, 9, 10, 11, 12, 13
Controlled by ESM 0
Right Disk Bank SCSI ID Numbers
8, 9, 10, 11, 12, 13
8, 9, 10, 11, 12, 13
Controlled by ESM 1
Chapter 1 Sun StorEdge D2 Array Overview 1-15