Deployment Guide

710 Fabric OS Command Reference
53-1003131-01
portCfg
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--ficon-read-blk [disable | enable]
Enables or disables 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.
--ficon-print [disable | enable]
Enables or disables FICON printer emulation on the specified FCIP tunnel.
This command is valid only with the modify option.
--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 (recommended
setting). The range is 1 to 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 (recommended
setting). The range is 1 to 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 to 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 to 32.
--write-timer value
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 to 1500.
--write-chain value
Defines the maximum amount of data that can be contained in a single CCW
chain. If this value is exceeded, emulation is suspended. The default value is
3.2 MB (3200000 bytes) The range is 1 MB to 5 MB.