
Summary of Motion and Reconnect Thresholds
Table 3-6 provides summary information about the motion and
reconnect thresholds.
Default
value
What it
controls...
What it represents
during a write
operation...
What it represents
during a read
operation...
Motion
Threshold
80h in
4-KByte
increments
(512 KBytes)
During start/stop
operations, the starting
and stopping of tape
motion (buffer/tape
transfers)
Minimum amount of
data that must be in
the buffer before
tape motion starts
and data is written
to the tape
Minimum amount of
space that must be
available in the
buffer before tape
motion starts and
data is read from
the tape
Reconnect
Threshold
80h in
3-KByte
increments
(384 KBytes)
During streaming
operations, the
disconnects and
reconnects between
the CTS and the
initiator (initiator/buffer
transfers)
Minimum amount of
space that must be
available in the
buffer before the
CTS reconnects to
the initiator and
accepts more data
Minimum amount of
data that must be in
the buffer before
the CTS reconnects
to the initiator and
transfers more data
If you feel that data transfers between a particular host and CTS need
to be fine-tuned, use the following rule-of-thumb to adjust the motion
or reconnect threshold:
If the data transfer rate is fast, raise the reconnect threshold.
If the data transfer rate is slow, raise the motion threshold.
Table 3-6 Motion threshold and reconnect threshold summary
3-22
EXB-8205 and EXB-8505
(Standard and XL)
510503
3 Implementing CTS Operations
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