Disconnect/Re-Connect - Tandberg Data SLR7-140 PROGRAMMER Manual

Write Mode SCSI-
bus Threshold
Read Mode SCSI-
bus Threshold
Tandberg Data
This is the threshold used when moving data from the
SCSI-bus into the
threshold is controlled by the Write Buffer Empty Ratio.
The Write Buffer
connect/reconnect frequency on the SCSI-bus during DATA
OUT phases. See the Disconnect/Reconnect Page of the
MODE SELECT command for details.
This is the threshold used when moving data from the
data buffer to the SCSI-bus in read mode. This threshold
is controlled by the Read Buffer Full Ratio. The Read
Buffer Full Ratio may affect the disconnect/reconnect
frequency on the SCSI-bus during DATA IN phases. See the
Disconnect/Reconnect Page of the MODE SELECT command for
details.
2.7.7.

Disconnect/Re-connect

When the Drive
transfer will be initiated until the data buffer can
accept the amount of data set up by the current write
bus threshold. Instead the Drive disconnects from the
SCSI-bus freeing the bus for use by other devices. As
soon as the data buffer can accept the data, the Drive
reconnects and transfers a burst of data. The size of
the burst is upwards limited by either available buffer
space or the Maximum Burst Size, whichever is smaller.
The Maximum Burst Size is specified by the host by means
of the Mode Select
requested for transfer,
again. A reconnect later will transfer another burst and
the whole process repeats until all requested data have
been transferred.
When the Drive
transfer will be initiated until the data buffer has
ready the amount of data set up by the current read bus
threshold. Instead
enough data to become ready. When this happens the Drive
reconnects and transfers a burst of data. The Drive will
also reconnect
exception has occurred. The size of the burst is limited
by the Maximum
requested for transfer the Drive disconnects again. A
reconnect later
whole process repeats until all requested data have been
transferred.
2-27 Tandberg SLR Product Line SCSI Functional Specifications
data buffer
Empty Ratio
is operating in
command. If
the Drive
is operating in
the Drive disconnects
if a tapemark
Burst Size. If
will transfer another
About Tape Streamers
in write mode.
may affect the
write mode no
still more data
then disconnects
read mode no
waiting
is pending or
still more data
burst and
This
dis-
data
is
data
for
if an
is
the