Cisco AP775A - Nexus Converged Network Switch 5010 User Manual

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48-34
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 48 Configuring FCIP
Using the FCIP Wizard
Figure 48-26 FCIP Link Tape Acceleration for Read Operations
The Cisco NX-OS provides reliable data delivery to the restore application using TCP/IP over the WAN.
While tape media errors during the read operation are returned to the restore server for error handling,
the Cisco NX-OS software recovers from any other errors.
Note The FCIP tape 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, the tape acceleration feature is turned
operationally off.
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 either SCSI discovery
failure or broken write or read operations.
Caution When tape acceleration is enabled in an FCIP interface, a FICON VSAN cannot be enabled in that
interface. Likewise, if an FCIP interface is up in a FICON VSAN, tape acceleration cannot be enabled
on that interface.
Note When you enable the tape acceleration feature for an FCIP tunnel, the tunnel is reinitialized and the write
and read acceleration feature is also automatically enabled.
In tape acceleration for writes, after a certain amount of data has been buffered at the remote Cisco MDS
switch, the write operations from the host are flow controlled by the local Cisco MDS switch by not
proxying the Transfer Ready. On completion of a write operation when some data buffers are freed, the
local Cisco MDS switch resumes the proxying. Likewise, in tape acceleration for reads, after a certain
FCFC
Restore
Server
MDS with
IPS
MDS with
IPS
Tape
Drive
WAN
144886
Read data N
Read data N+1
Status N
Status N+1
Read command N
Read command N
Read command N+1
Read command N+1
Read command N+2
Read data N
Read data N
Status N
Status N
Status N+1
Status N+1

Cisco AP775A - Nexus Converged Network Switch 5010 Specifications

General

Brand	Cisco
Model	AP775A - Nexus Converged Network Switch 5010
Category	Switch
Language	English