2 supported optional features, 1 internal disk drives, 2 internal tape drives – IBM RS/6000 User Manual

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2.4.2 Supported Optional Features

In this section, we consider as “optional features” the internal optional devices,
external adapters and external subsystems that can be configured on the RS/6000
Model E20.

2.4.2.1 Internal Disk Drives

Six internal SCSI-2 disk drives can be accommodated in the internal bays of the
system. The disk drives that can be installed and configured are described in
Table 2.

Only disk drives with a 1-inch height (half-height) are supported for internal use.
Disk drives with 1.6-inch height are not supported as they may result in overheating
of the system.

Table 2. Optional Disk Drives on Model E20

Formatted Capacity

1080 MB

1.1 GB

2.2 GB

Feature Number

# 2397

# 3032

# 3033

SCSI Bus Rate MB/sec

Average Seek Time ms

12.0

8.5

RPM

5400

7200

Average Latency ms

5.6

4.17

Interface

SCSI-2

F/W

SCSI-2

F/W

Data Width

8-bit

16-bit

Note: Maximum Internal Disk Drives: 6

2.4.2.2 Internal Tape Drives

Currently, the only tape drive that can be installed in an internal bay of the system
is the 4GB/8GB 4mm Internal Tape Drive.

A maximum of two internal tape drives can be installed. Due to overheating
problems that could lead to data errors, they have to be mounted in bay number 6
and 8, leaving bay number 7 empty. If one tape drive has to be installed, we
suggest mounting it in bay number 8.

Table 3. Optional Tape Drives on Model E20

Tape Capacity

4.0 GB

8.0 GB

Feature Number

# 6142

Cartridge

IBM 4mm DDS

Data Compression

Yes

Max Effective Transfer Rate

400 KB/sec

800 KB/sec

Interface

SCSI-2 (8 bit)

Bays

1 half-height

Note: Maximum Internal Tape Drives: 2

Chapter 2. PCI-Based RS/6000 Server Hardware