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

Table 96 IPSec terminology (continued)
Term
HMAC
SA
The following limitations apply to using IPSec:
• IPv6, NAT, and AH are not supported.
• You can only create a single secure tunnel on a port; you cannot create a nonsecure tunnel on the same
port as a secure tunnel.
• IPSec-specific statistics are not supported.
• To change the configuration of a secure tunnel, you must delete the tunnel and recreate it.
• Jumbo frames are not supported for IPSec.
• There is no RAS message support for IPSec.
• Only a single route is supported on an interface with a secure tunnel.
• 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 457 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.
Definition
A stronger MAC because it is a keyed hash inside a keyed hash.
Security Association is the collection of security parameters and authenticated
keys that are negotiated between IPSec peers.
See"Configuring FCIP tunnels" on page 434 for details.
Fabric OS 6.x administrator guide 421
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