S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m
26-4
Cisco MDS 9000 Family Command Reference
OL-18089-01, Cisco MDS NX-OS Release 4.x
Chapter 26 W Commands
write-accelerator
write-accelerator
To enable write acceleration and tape acceleration for the FCIP interface, use the
write-accelerator
command
in configuration mode
. To disable this feature or revert to the default values, use the
no
form
of the command.
write-accelerator
[
tape-accelerator
[
flow-control-butter-size
bytes
]]
no write-accelerator
[
tape-accelerator
[
flow-control-butter-size
]]
Syntax Description
Defaults
Disabled.
The default flow control buffer size is 256 bytes.
Command Modes
Configuration mode.
Command History
Usage Guidelines
The write acceleration feature is disabled by default and must be enabled on both sides of the FCIP link.
If it is only enabled on one side of the FCIP tunnel, then the tunnel will not initialize.
In Cisco MDS SAN-OS Release 3.x, the
write-accelerator
command enables read acceleration if both
ends of an FCIP tunnel are running SAN-OS Release 3.x.
If one end of an FCIP tunnel is running SAN-OS Release 3.x, and the other end is running SAN-OS
Release 2.x, the
write-accelerator
command enables write acceleration only.
Tip
FCIP Tape acceleration does not work if the FCIP port is part of a PortChannel or if there are multiple
paths between the initiator and the target port. Such a configuration might cause SCSI discovery failure
or broken write or read operations.
Examples
The following command enables write acceleration on the specified FCIP interface.
switch#
config terminal
switch(config)#
interface fcip 51
switch(config-if)#
write-accelerator
The following command enables write acceleration and tape acceleration on the specified FCIP
interface.
tape-accelerator
Enables tape acceleration.
flow-control-butter-size
bytes
Specifies the flow control buffer size.
Release
Modification
1.3(1)
This command was introduced.
2.0(x)
Added
tape-accelerator
and
flow-control-butter-size
options.