HP Enterprise File Services WAN Accelerator Enabling Hstcp Protocol Options, ControlDescription

ControlDescription

Add New Volume Configuration FSID. Specify the file system identification number (ID) to add a new NFS volume.

Policy. Select one of the following options from the drop-down list to configure the policy for NFS volumes:

•Global Read-Write. Specifies a policy that provides a trade-off of performance for data consistency. All of the data can be accessed from any client, including LAN based NFS clients (which do not go through the HP EFS WAN Accelerators) and clients using other file protocols like CIFS. This option severely restricts the optimizations that can be applied without introducing consistency problems. This is the default configuration.

•Custom. Enables you to turn on or off the root squash feature for NFS volumes from this server.

•Home Directory. All accesses to each directory are by a single user. This policy allows aggressive caching of data and metadata.

Enable Root Squash. Select this option to enable root squashing.

Add Volume. Click Add Volume to add the NFS volume to the list.

Remove Selected Volumes. To remove an entry, click the check box next to the name and click Remove Selected Volumes.

Enabling

HSTCP Protocol

Options

5.Click Save to save your settings permanently or click Reset to return the settings to their previous values.

You enable the High Speed Transmission Control Protocol (HSTCP) in the Optimization Service - Protocol: HSTCP page.

HSTCP provides acceleration and high throughput for high bandwidth networks where the WAN pipe is large but latency is high. HSTCP is activated for all connections that have a Bandwidth-Delay Product (BDP) larger than 100 packets. HSTCP is available only on the Series 5000.

To configure HSTCP you must perform the following tasks.

Task	Description
Enable HSTCP support.	For detailed information, see “To enable HSTCP protocol support” on page 43.
Increase the WAN buffers.	Increase the WAN buffers to 2 Bandwidth Delay Product (BDP) or 10 MB. For
	detailed information, see “To enable HSTCP protocol support” on page 43.
	You can calculate the BDP WAN buffer size. For example, for a link of 155
	Mbps and 100 ms round-trip delay, the WAN buffers should be set to:
	2 * 155 Mbps * 100 ms = 3875000 bytes
Increase the LAN buffers.	Increase the LAN buffers to 1 MB. For detailed information, see “To enable
	HSTCP protocol support” on page 43.

42 CONFIGURING THE HP EFS WAN ACCELERATOR