A.2.1.1 SCSI 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
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
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
Model 501 - desk side, supported by 34H, 360, 370, and 500 series (8.0 GB
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 184.108.40.206, “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
, 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
328 AIX Storage Management