AIX Storage Management

A.2.1.1 SCSI Drives

3.5

″

Drives:

The following drives are available. They are SCSI-2 single-ended

unless otherwise specified.

•

#2490 - 200MB, supported on 200, 300 series

•

#2560 - 400MB (SCSI), supported on 200, 300 series

•

#2390 - 540MB, supported on 200, 300 series

•

#2555 - 1.0GB, supported on 200, 300, 500, 900 series

•

#2565 - 1.0GB (differential), supported on 9334

•

#2580 - 2.0GB, supported on 200, 300, 500, 900 series

•

#2585 - 2.0GB (differential), supported on 9334

5.25

″

Drives:

The following drives are available:

•

#2570 - 1.37GB (SCSI), supported on 500 series and 9334

•

#2590 - 2.4GB (SCSI-2), supported on 500 series and 9334

A.2.1.2 Serial Drives

The following drives are available:

•

#3100 - 857MB (5.25″), supported on 9333

•

#3110 - 1.07GB (5.25″), supported on 9333

•

#3120 - 2.0GB (3.5″), supported on 9333

A.2.2 Disk Subsystems

The following disk subsystems can be attached to the RS/6000.

A.2.2.1 IBM 7203 and 7204 External Disk Drives

The 7203 provides an external disk drive supporting a removable disk pack of

either 355MB or 1.0GB. This is useful for environments where security is an

issue, as the disk pack can be removed and stored in a secure place. Disk packs

can also be moved between machines, allowing easy sharing of information. The

7203 supports a standard SCSI interface, and is attachable to all systems.

The 7204 is an external disk unit supporting the following capacities:

•

Model 320 - 320MB, SCSI-2 interface, supported on 200, 300, 500, 900 series

•

Model 001 - 1.0GB, SCSI-2 interface, supported on 200, 300, 500, 900 series

•

Model 010 - 1.0GB, SCSI-2 interface, supported on 200, 300, 500, 900 series,

this unit has faster access times

•

Model 215 - 2.0GB, SCSI-2 differential interface, supported on 300, 500, 900

series

A.2.2.2 IBM 9334 SCSI Expansion Unit

The 9334 SCSI Expansion Unit provides support for up to four SCSI disk drives

per unit. There are four models:

•

Model 010 (SCSI-2), rack mounted, supported by the 900 series

•

Model 011 (SCSI-2 differential), rack mounted, supported by the 900 series

•

Model 500 (SCSI-2), desk side, supported by the 200, 300, 500 series

Appendix A. Overview of Hardware Components 327

•

Model 501 (SCSI-2 differential), desk side, supported by the 300, 500 series

A.2.2.3 IBM 9333 High Performance Disk Drive Subsystem

The 9333 High Performance Disk Drive Subsystem attaches to a port on the High

Performance Disk Drive Subsystem adapter, and supports up to four serial disks.

The 9333 is designed to provide the fastest response time when an application

makes large numbers of requests for short blocks of data.

The 9333 also supports multiple paths from its controller to the processor,

allowing a 9333 to attach simultaneously to up to eight hosts processors. This is

useful for high availability environments or data sharing. Independent electrical

paths are provided to each host, so bandwidth is not shared, nor will electrical

failure in one path affect the others.

There are four models of the 9333:

•

Model 010 - rack mounted, supported by the 900 series (4.3GB max)

•

Model 011 - rack mounted, supported by the 900 series (8.0GB max)

•

Model 500 - desk side, supported by 34H, 360, 370, and 500 series (4.3 GB

max)

•

Model 501 - desk side, supported by 34H, 360, 370, and 500 series (8.0 GB

max)

A.2.2.4 IBM 7134 High Density SCSI Disk Subsystem

The 7134 High Density SCSI Disk Subsystem can hold 16 3.5″ 2.0GB SCSI disk

drives. These drives are split into two banks of eight drives, each on a separate

internal (to the 7134) SCSI adapter. The 7134 itself requires a SCSI-2 differential

fast/wide adapter to attach to the system. The subsystem can be connected to

two hosts for availability reasons, and in this case, only six drives are supported

in each bank.

There is one model of the 7134:

•

Model 010 - rack mounted, supported by the 300, 500, 900, and R series

A.2.2.5 IBM 7135 RAIDiant Array

The 7135 RAIDiant Array provides high data availability and/or performance

using RAID technology (RAID is explained in 2.2.2.2, “Selecting the Correct Disk

Storage Devices” on page 27); RAID levels 0, 1, 3, and 5 are supported.

Essentially any combination of RAID levels are concurrently supported on the

7135, with the

Logical Unit

, or LUN of disks supporting each defined RAID level

appearing as a single SCSI disk drive to the operating system.

The 7135 is connected to the host system via either a SCSI-2 differential adapter,

or a SCSI-2 fast/wide differential adapter. The disks are connected internally to

five SCSI-2 buses, giving a maximum number of 30 disks; either 2.0GB, or 1.3GB

3.5″ disks are supported.

The 7135 has an internal controller that manages the RAID functions, and a

second controller may be added operating in either standby mode (taking over in

the event of failure of the first), or in active mode (providing enhanced

performance as well as availability). In addition, redundant power supplies and

cooling are standard, and maintenance is supported concurrently on any failing

hardware.

328 AIX Storage Management