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8
Configuring FICON Extension
8-27
Configuring a 1x1 Ethernet Wide Area Network
• Enable Tape Write Pipelining - Check this box if Tape Pipelining
should be enabled on this interface. If a data path is mapped for
this interface, UltraNet ConfigManager ensures that the Tape
Write Pipelining option is also enabled on the peer interface.
• Max Write - In this field, enter the number of channel commands
that may be outstanding at a given time during write pipelining.
Too small of a value will result in poor performance. The value
should be chosen carefully based upon the typical tape channel
program that requires optimum performance. For Peer to Peer
VTS connections the default value is 69. For other applications,
the default value is 32.
• Max ECBs - In this field, enter the maximum number of devices
which may be write pipelining on a path. Pipelining does not
increase performance if there are many devices active on one
path, and can actually slow performance if there are too many
active devices. The default value is 8.
• Write Timer (ms) - In this field, enter a time limit for pipelined
write chains. This value must be specified in milliseconds (ms).
If a pipelined write chain takes longer than this value to complete,
the ending status for the next write chain will be withheld from
the channel. This limits processing to what the network and
device can support. Too small of a value will limit pipelining
performance. Too large of a value will result in too much data
being accepted for one device on a path. The default value is 300
milliseconds (ms).
• Back - Click Back to return to the previous dialog.
• Next - Click Next to proceed to the next dialog.
• Cancel - Click Cancel to exit the FICON Global Settings Wizard.
• Help - Click Help, or press F1, to view the help information for
the dialog.
Select FICON Tape
Read Pipelining I/Fs
This dialog displays all FICON interfaces that support Tape Read
Pipelining in the network. Additionally, this dialog displays the
current Tape Read Pipelining configuration information for the
FICON interface. Use this dialog to select interfaces that you want to
configure.
• Select All - Click Select All to select all FICON Tape Read
Pipelining interfaces.