HP StorageWorks Enterprise File Services WAN Accelerator 2.1.7 Command-Line Interface Reference Manual (392361-004, June 2006)
162 4 - CONFIGURATION-MODE COMMANDS
You need to carefully evaluate whether HSTCP will benefit your network
environment. To enable HSTCP you must disable the Lempel-Ziv (LZ) compression
and Scalable Data Referencing (SDR). With SDR your throughput will bottleneck
between 100 and 150 Mbps, which cancels out the benefit of HSTCP.
For someone with an Optical Carrier-3 line or faster, turning off SDR makes sense and
allows HSTCP reach its full potential. For a 2 Mbps link regardless of the amount of
latency, it is better to keep SDR enabled, because the HSTCP mechanism is typically
not triggered until you reach beyond 100 Mbps of WAN throughput.
NOTE: If you want to delete the license for HSTCP, you must first disable the feature.
Syntax tcp highspeed enable
Parameters None
Usage To configure HSTCP you must:
have a valid license for HSTCP.
enable HSTCP.
if your WAN link capacity is 100 Mbps, disable the Lempel-Ziv (LZ)
compression and Scalable Data Referencing (SDR) in the optimization policies.
For detailed information, see “in-path rule auto-discover” on page 100.
enable in-path support. For detailed information, see “in-path enable” on page 94.
increase the WAN buffers to 2 Bandwidth Delay Product (BDP) or 10 MB. You
can calculate the BDP WAN buffer size. For a link of 155 Mbps and 100 ms
round-trip delay, the WAN buffers should be set to:
2 * 155 Mbps * 100 ms = 1937500 bytes
increase the LAN buffers to 1 MB.
For example:
minna (config) # tcp highspeed enable
minna (config) # in-path rule auto-discover srcaddr 0.0.0.0/0 dstaddr
0.0.0.0/0 dstport 0 optimization none vlan -1 neural-mode always rulenum
1
minna (config) # in-path enable
minna (config) # protocol connection lan receive buf-size 1000000
minna (config) # protocol connection lan send buf-size 1000000
minna (config) # protocol connection wan receive def-buf-size 3875000
minna (config) # protocol connection wan send def-buf-size 3875000
Example minna (config) # tcp highspeed enable
minna (config) #
terminal
Description Configures the terminal display settings. The no command option disables the
terminal settings.