Brocade Fabric OS Command Reference Guide v6.1.0 (53-1000599-02, June 2008)

Fabric OS Command Reference 437
53-1000599-02
portCfg
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by hosts (channels) attached at the opposite side. Too small of a value
results 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 does not affect tape write operations initiated
by hosts (channels) attached at the opposite side. Too small of a value
results 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 does not affect tape write operations initiated
by hosts (channels) attached. The default value is 16. The range is 1-32.
-g |--rdMaxDevs 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 does not affect tape read operations initiated
by hosts (channels) attached at the opposite side. The default value is
16. The range is 1-32.
-e |--wrtTimer value
Defines a time limit for pipeline write chains. This value is specified in
milliseconds (ms). If a pipeline write chain takes longer than this value to
complete, the ending status for the next write chain is 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.
-n |--wrtMaxChains 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 (3000000 bytes) The range is 1 Mb-5 Mb.
-o |--oxidBase value
Defines the base value of an entry pool of 256 OXIDs supplied to
emulation-generated exchanges. It should fall outside the range used by
FICO channels and devices to avoid conflicts. The default value is
0x1000. The range is 0x0000 to 0xF000.