Specifications

2.6 RA9x Disk Drive
The RA90 and RA92 disk drives are physically identical, but have different
capacities, as follows.
• The RA90 has a capacity of 1.22 GB (1.62 GB unformatted).
• The RA92 has a storage capacity of 1.51 GB (1.99 GB unformatted).
See the RA90/RA92 Disk Drive User Guide for more information.
2.7 ESE50 Solid State Disk
The ESE50 solid state disk (SSD) is a member of the DIGITAL Storage
Architecture/Standard Disk Interconnect (DSA/SDI™) family and is, therefore,
completely compatible with all DSA/SDI controllers.
The ESE50 SSD is a random-access, low-latency storage device that uses dynamic
random-access memory (DRAM) technology. It is contained in a half-rack
enclosure identical to the RA9x disk drive. The ESE50 SSD has its own power
and data retention capabilities. It connects to and operates on the SDI bus and
may be used with controllers implementing this bus. The SSD operator control
panel (OCP) is the same as the RA9x OCP.
See the ESE50 SSD User Guide for more information.
2.8 TA8x7-Series Storage Subsystems
The TA8x7-series storage subsystems consists of a magazine tape system and an
SCSI/SDI adapter-interface.
Note
A maximum of three TA8x7 series storage subsystems can be installed in
an SA900 storage array.
2.8.1 TZ857-Series Magazine Tape Subsystem
The TZ857 magazine tape subsystem is an electromechanical device that uses
from one to seven CompacTape III cartridges to store from 2.6 GB to 18.2 GB of
data.
The TZ857 magazine tape subsystem can load and unload tape cartridges to
and from a tape drive for unattended backup, as well as performing single
cartridge operations. The TZ857 subsystem performs automatic, sequential tape
operations.
In addition, the TZ857 subsystem executes operating system commands,
qualifiers, and parameters to store data from user disk areas to the tape drive.
See the Tx857 Series Magazine Tape Subsystem Owner’s Manual for more
information.
2–2 Storage Array Descriptions