Options For Enhancing Tape Write I/O Performance; Fcip Fastwrite And Tape Pipelining; Using Fcip Fastwrite And Tape Pipelining - HP A7533A - Brocade 4Gb SAN Switch Base Administrator's Manual

• IPSec can only be configured on IP V4 based tunnels. Secure tunnels can not be created on a 400
Multi-protocol Router or FR4- 1 8i blade if any IP V6 addresses are defined on either ge0 or ge1.
• Secure Tunnels cannot be defined with VLAN Tagged connections.

Options for enhancing tape write I/O performance

There are two options available for enhancing open systems SCSI tape write I/O performance.
•

FCIP fastwrite and tape pipelining.

• FC fastwrite.
FCIP fastwrite and tape pipelining are implemented together. FC fastwrite is an FC-FC routing alternative
that disables the local Ethernet ports (ge0 and ge1), making it impossible to configure FCIP fastwrite and
tape pipelining and FC fastwrite on the same 400 Multi-protocol Router or FR4- 1 8i blade. Refer to
fastwrite concepts" on page 461 for information about FC fastwrite.
FC fastwrite flows may be routed to another 400 Multi-protocol Router or FR4- 1 8i blade on the FC network.
This 400 Multi-protocol Router or FR4- 1 8i blade may have active FCIP tunnels over an IP network. FC
fastwrite flows may be passed through the FCIP tunnel, but only if the FCIP fastwrite option is disabled on
the tunnel.
FCIP fastwrite and tape pipelining
When the FCIP link is the slowest part of the network, consider using FCIP fastwrite and tape write tape
pipelining. Supported only in Fabric OS 5.2.x and later, FCIP fastwrite and tape pipelining are two
features that provide accelerated speeds for write I/O over FCIP tunnels in some configurations:
• FCIP fastwrite accelerates the SCSI write I/Os over FCIP.
• Tape pipelining accelerates SCSI write I/Os to sequential devices (such as tape drives) over FCIP, which
reduces the number of round-trip times needed to complete the I/O over the IP network and speeds up
the process. To use tape pipelining, you must also enable fastwrite.
• Both sides of an FCIP tunnel must have matching configurations for these features to work.
FCIP fastwrite and tape pipelining are enabled by turning them on during the tunnel configuration process.
They are enabled on a per-FCIP tunnel basis.
Constraints for FCIP fastwrite and tape pipelining
Consider the constraints described in
Table 88

Using FCIP fastwrite and tape pipelining

FCIP fastwrite
Each GbE port supports up to 2048
simultaneous accelerated exchanges, which
means a total of 2048 simultaneous
exchanges combined for fastwrite and tape
pipelining.
Does not affect FICON traffic
FCIP fastwrite and FC fastwrite are mutually
exclusive.
Does not support multiple equal-cost path
configurations (see
pipelining configurations" on page 382).
See"Configuring FCIP
Table 88
"FCIP fastwrite/tape
tunnels" on page 394 for details.
when configuring tunnels to use either of these features.
Tape pipelining
Each GbE port supports up to 2048
simultaneous accelerated exchanges, which
means a total of 2048 simultaneous
exchanges combined for fastwrite and tape
pipelining.
Does not affect FICON traffic
Tape pipelining uses FCIP fastwrite, not FC
fastwrite.
Does not support multiple equal-cost path
configurations or multiple non-equal-cost path
configurations (see "FCIP fastwrite/tape
pipelining configurations" on page 382).
Fabric OS 6.1.x administrator guide 381
"FC