Brocade OS Command Reference Manual Supporting Fabric OS v6.0.0 (53-1000599-01, October 2007)

430 Fabric OS Command Reference
53-1000599-01
portCfg
2
-r 1|0 Enables or disables Tape Read Pipelining. This feature improves performance
for certain applications when reading from FICON tape over extended
distances. 1 is enabled, O is disabled.
-t 1|0 Enables or disables TIN/TIR emulation. This feature enhances recovery when
a TIN/TIR exchange occurs as part of a channel recovery operation during
tape emulation. 1 is enabled, O is disabled.
-l 1|0 Enables or disables Device Level Acknowledgement emulation. This feature is
applicable to both FICON Disk and Tape configurations. The feature removes
one network round trip for exchanges that end with a Device Level
Acknowledgement frame from the device. 1 is enabled, O is disabled.
-i 1|0 Enables or disables FICON Tape Read Block ID. This feature permits FICON
write channel programs containing embedded read block ID commands
(Cadres) with a byte count of exactly four bytes to be processed as emulated
commands during write emulation processes. 1 is enabled, O is disabled.
The following optional parameter specific arguments are supported with the config and delete
options.
-a |--wrtMaxPipe value
‘ Defines the maximum number of tape write channel commands (CCWs) that
can enter the write pipeline for a single device whether all the CCWs are
bundled in a single channel program or in multiple channel programs. The
setting has significance only for host (channel) initiated operations at this
side and will not affect tape write operations initiated by hosts (channels)
attached at the opposite side. Too small of a value will result in poor
performance. The value should be chosen based upon the typical tape
channel program that requires optimum performance. The default value is
32. the range is 1-100.
-b |--rdMaxPipe value
Defines the maximum number of tape read channel commands (CCWs) that
can enter the read pipeline for a single device whether all the CCWs are
bundled in a single channel program or in multiple channel programs. The
setting has significance only for host (channel) initiated operations at this
side and will not affect tape write operations initiated by hosts (channels)
attached at the opposite side. Too small of a value will result in poor
performance. The value should be chosen based upon the typical tape
channel program that requires optimum performance. The default value is
32. The range is 1-100.
-c |--wrtMaxDevs value
Defines the maximum number of concurrent emulated tape write operations.
As concurrency increases, the value of emulation decreases. Excessive
concurrency has the potential to oversubscribe packet data memory. The
setting has significance only for host (channel) initiated operations at this
side and will not affect tape write operations initiated by hosts (channels)
attached The default value is 16.The range is 1-32.
-g |--rdMaxDevs value