Installation guide

Introduction

1.2 Storage Enclosure Overview

The SF-series storage enclosures come in two series: the SF3x enclosure that

contains up to 12 half-height, 3 1/2-inch ISEs, and the SF7x enclosure that

contains up to 4 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 12 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 mode 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 one of two modes: through-bus or split-bus.

• 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,

and Table 1–4 shows the speciﬁcations for the SF7x series storage enclosure.

1–6 Introduction