Hardware Overview - Sun Microsystems StorEdge D2 Array Best Practices Manual

d. MESSAGE REJECT Message (07h)
e. NO OPERATION Message (08h)
f. MESSAGE PARITY ERROR Message (09H)
g. BUS DEVICE RESET Message (0Ch)
h. IDENTIFY (80h -FFh)
3. SAF-TE Read Buffer Commands
a. READ ENCLOSURE CONFIGURATION (00h)
b. READ ENCLOSURE STATUS (01h)
c. READ DEVICE SLOT STATUS (04h)
4. SAF-TE Write buffer Commands
a. WRITE DEVICE SLOT STATUS (10h)
b. PERFORM SLOT OPERATION (12h)
c. SEND GLOBAL COMMAND (15h)
1.4

Hardware Overview

Refer to
The Sun StorEdge D2 ESM has two host Ultra3 SCSI connections (host 1 and host 2)
and two back-end drive Ultra3 SCSI connections (array 1 and array 2). A single
53C040 on the Sun StorEdge D2 ESM reports enclosure status and controls indicators
through the SAF-TE command interface. The D2 enclosure supports one or two D2
ESMs (the "0" and "1" ESM, described in Chapter 2).
In single bus mode (and with the ESM in the "0" slot), both host connections
communicate with both back-end drive connections. Array 1 maps to SCSI IDs 0-5
and Array 2 maps to SCSI IDs 8-13. In split-bus mode, the connection to Array 2 is
disabled for the ESM in the "0" slot and the connection to Array 1 is disabled for the
ESM in the "1" slot. Thus the host 1 and host 2 connections on ESM 0 communicate
with Array 1 (mapped to SCSI IDs 8-13) and the host 1 and host 2 connections on
ESM 1 communicate with Array 2 (mapped to SCSI IDs 8-13).
1-4 Sun StorEdge D2 Array Best Practices Guide • January 2002
, ESM Block Diagram.
FIGURE 1-1