HP Brocade 8/24c Brocade Fabric OS Command Reference Manual Supporting Fabric - Page 645

Enables 1 or disables 0 FICON read Tape Read Block ID emulation. This, ficon-tape-read, ficon-tin-tir

Page 645 highlights

22 portCfg --ficon-tape-read [0|1] Enables (1) or disables (0) FICON Tape Read Pipelining. This feature improves performance for certain applications when reading from FICON tape over extended distances. --ficon-tin-tir [0|1] Enables (1) or disables (0) FICON TIN/TIR emulation. This feature enhances recovery when a TIN/TIR exchange occurs as part of a channel recovery operation during tape emulation. This feature is enabled by default (recommended setting). --ficon-dvcack [0|1] Enables (1) or disables (0) FICON 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. This feature is enabled by default (recommended setting). --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 (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. Fabric OS Command Reference 611 53-1001764-01

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Fabric OS Command Reference
611
53-1001764-01
portCfg
22
--ficon-tape-read
[0|1]
Enables (1) or disables (0) FICON Tape Read Pipelining. This feature
improves performance for certain applications when reading from FICON
tape over extended distances.
--ficon-tin-tir
[0|1]
Enables (1) or disables (0) FICON TIN/TIR emulation. This feature enhances
recovery when a TIN/TIR exchange occurs as part of a channel recovery
operation during tape emulation. This feature is enabled by default
(recommended setting).
--ficon-dvcack
[0|1]
Enables (1) or disables (0) FICON 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. This
feature is enabled by default (recommended setting).
--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 (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.