HP Cisco MDS 9124 Cisco MDS 9000 Family Command Reference - Cisco MDS SAN-OS R - Page 1518

write-accelerator Chapter 26 W Commands Send documentation comments to [email protected] 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 tape-accelerator flow-control-butter-size bytes Enables tape acceleration. Specifies the flow control buffer size. Defaults Disabled. The default flow control buffer size is 256 bytes. Command Modes Configuration mode. Command History Release 1.3(1) 2.0(x) Modification This command was introduced. Added tape-accelerator and flow-control-butter-size options. 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. 26-4 Cisco MDS 9000 Family Command Reference OL-16217-01, Cisco MDS SAN-OS Release 3.x