Brocade Communications Systems 1606 Command Reference Manual page 613

Fabric OS Command Reference
53-1001337-01
--ficon-read-blk 0|1
Enables (1) or disables (0) FICON read Tape Read Block ID emulation.
This feature permits FICON write channel programs containing
embedded read block ID commands (CCWs) with a byte count of exactly
four bytes to be processed as emulated commands during write
emulation processes.
--max-read-pipe 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.
--max-write-pipe 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.
--max-read-devs value
Defines the maximum number of concurrent emulated tape read
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 read operations initiated
by hosts (channels) attached at the opposite side. The default value is
16. The range is 1-32.
--max-write-devs 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.
--write-timer 0|1
Defines a time limit for pipelined write chains. This value is 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 a value limits pipelining performance. Too large a
value results in too much data being accepted for one device on a path.
The default value is 300 milliseconds (ms). The range is 100-1500.
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portCfg
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