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19-12
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-6965-03, Cisco MDS SAN-OS Release 2.x
Chapter 19 FCIP Configuration
FCIP Tape Acceleration
Figure 19-9 FCIP Link Tape Acceleration
Note The 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 tunnel is not initialized.
Tip FCIP tape acceleration does not work if the FCIP port is part of a PortChannel or if there are multiple
paths with equal weight 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 a FCIP interface is up in a FICON VSAN, write acceleration cannot be enabled
on that interface.
When you enable the tape acceleration feature, you are automatically enabling the write acceleration
feature. When you enable tape acceleration for an FCIP tunnel, the tunnel is reinitialized.
The flow control buffer size specifies the maximum amount of write data that an MDS switch buffers for
an FCIP tunnel before it stops the tape acceleration proxying process. The default buffer size is 256 KB
and the maximum buffer size is 32 MB.
FCFC
Backup
Server
MDS with
IPS
MDS with
IPS
Tape
Drive
Write Command 1
Write Command 1
Write Command 1
Write Command N
Write Command N
Write Command N
Status 1 Status 1
Status N
Status N
WAN
WRITE FILEMARKS status
WRITE FILEMARKS operation
WRITE FILEMARKS operation
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