Digital Equipment EK-SFXXS-SG-003, Руководство по обслуживанию

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1–6 Introduction
1.2 Storage Enclosure Overview
The SF-series storage enclosures are available in two series; the SF3x
enclosure, which contains up to twelve half-height, 3 1/2-inch ISEs, and
the SF7x enclosure which contains up to four full-height, 5 1/4-inch ISEs.
Each disk ISE within an SF-series enclosure is independently controlled
from the OCP on the front of the enclosure. A power supply in the
enclosure provides the dc power and cooling for all disk ISEs installed in
the enclosure.
The SF3x storage enclosure (Figure 1–2) holds up to twelve RF3x series
ISEs. There are six slots in the front of the enclosure and six slots
in the rear. Disk ISEs installed in these slots plug directly into a
backplane, which is cabled to a connector tray on the top rear of the
storage enclosure.
The SF3x enclosure can be configured in through-bus or split-bus mode.
In through-bus mode, the six ISEs in the front of the SF3x enclosure are
connected to a single DSSI bus, and the six ISEs on the rear of the SF3x
enclosure are connected to a second DSSI bus. In split-bus mode, each end
of the enclosure (front and rear) is further divided into left-side ISEs and
right-side ISEs, each connected to a separate DSSI bus. Thus, in split-bus
mode there are four DSSI buses, each with three drives connected to it.
The SF7x series storage enclosure (Figure 1–3) holds either two or four
RF7x series ISEs. The ISEs in the SF7x storage enclosure can also be
configured in split-bus or through-bus mode. In through-bus mode, all
four disk ISEs are connected to a single DSSI bus. In split-bus mode, the
left-side ISEs are connected to one DSSI bus, while the right-side ISEs
are connected to a second DSSI bus.
Both SF-series storage enclosures have the following features:
• It can operate in through-bus or split-bus mode.
• Each disk ISE has its own set of switches and indicators on the OCP.
• The enclosure power supply provides operating power to all disk ISEs
and other subassemblies in the enclosure.
• The drive dc power switches for the disk ISEs are on the front panel
of the storage enclosure.
Specifications for the SF3x series storage enclosure are shown in
Table 1–3. Specifications for the SF7x series storage enclosure are shown
in Table 1–4.