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The 3490-A01 is a 18-track, 1 Control Unit component for an IBM 3490
tape subsystem. The Model A01 supports the 3490 Models B02 and B04 Tape
Drive Units. The Model A01 can be field upgraded to either a Model A02
or Model A10, providing granularity from a minimum 1x2 (A01 x B02-18 track)
configuration to a maximum 2x8 (A10 x four B20-36 track) configuration.
Included as standard in the Model A01 is Improved Data Recording Capability
(IDRC).
The 3490 Model A01 Control Unit contains one 18 track control unit function
and one power supply. Components are serviced from the rear to minimize
operational interference.
The Model A01 will attach up to two Model B04 drive units, four Model
B02 drive units or one Model B04 and up to 2 Model B02 drive units, (B02
drive units must be last in configuration). Up to four channel attachments
can be specified.
The 3490 supports 1.5, 2.0, 3.0, and 4.5 Mb/Sec channel data rates. The
cable distance of the 3490 A01 can be extended using the IBM 3044 Fiber-Optic
Channel Extender Link Model C02 and D02 with the Enhanced Tape Attachment
Feature (#6053), see ESCON Adapter section for details.
Improved Data Recording Capability (IDRC), which is standard, can increase
effective cartridge capacity by up to five times and in conjunction with
4.5 Mb/Sec. channels, can improve subsystem performance by up to 70 percent
when compared to 3480 attached to 3.0 Mb/Sec channels. The 3490 A01 can
read and write 3480 recording format providing complete data interchange
with the 3480.
The single control unit function Model A01 is field upgradeable to the
dual control unit function Model A02 as well as to the single control
unit function Model A10 which is capable of supporting up to eight 36
track drive units.
Business Solutions
The 3490 Model A01 is a multiple microprocessor-driven control unit with
a 2Mb dynamic data buffer per logical control unit and a flexible number
of channel features.
The IBM 3490 Control Unit Model A01 provides connection of up to eight
drives and can be upgraded to a 3490 Control Unit Model A02 or Model A10.
The IBM 3490 requires no scheduled preventive maintenance. IBM customer
engineers use a microprocessor-based maintenance device to perform diagnostics
and repairs. Service is accomplished from the rear of the Model A01, improving
user operations and drive availability.
User Productivity
IBM technology, featuring thin film heads, improved error correction
capability, and enclosed tape cartridges, offers high availability. This
technology is included in all IBM 3490 product family members. The proven
IBM error correction capability has been implemented through error recovery
programs in the control unit's microcode.
The Improved Data Recording Capability (IDRC) is standard on the Model
A01. When utilizing IDRC, fewer cartridges may be required to store the
same amount of data, resulting in fewer mounts and demounts, shorter rewind
times, and fewer cleaning cycles. IDRC also provides up to 70 percent
tape performance improvement compared to 3480 tape drives operating with
3Mb/sec channels without the IDRC feature.
The 2Mb buffer in the control unit allows data to be transferred between
the buffer and the channel at channel data transfer rates, since the host
processor doesn't have to wait for the physical drive to respond to read
and write commands.
During read operations, the buffer permits the control unit to respond
rapidly to host read commands by prereading multiple data records from
drives into the buffer. Similarly, during write mode operations, multiple
data records can be transferred from a host to a control unit's buffer
at channel speeds.
Growth Enablement
The 3490 Model A01 is upgradeable to the Model A02 by the addition of
another logical control unit. The 3490 Model A01 is also upgradeable to
the Model A10. The Model A10 has a single control unit function capable
of supporting up to eight 36 track drive units of Models B20 or B40.
The 3490 Model A01 is upgradeable to the Model A10. The Model A10 supports
the 18 track drive units Models B02 and B04.
The 3490 Models A01 may be attached to any of the following hosts processors.
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