You can set properties to configure the packet size of UDT packets and the buffer size for UDT in source or destination clouds.

You may need to configure UDT in some scenarios. For example, in low bandwidth networks, if you copy a large object from a private cloud to a public cloud using the UDT protocol, copy might fail. In this case, configure a smaller UDT packet size and update the buffer size accordingly.

You can set the following properties.

UDT Properties

Property

Description

Default Value

Recommended Value

udt_pkt_size

Packet size of UDT packets

1048576 KB

For low bandwidth networks:

1024-1048576 (1KB to 1MB)

udt_snd_buf_size

Buffer size of UDT at the source

10485760 KB

Approximately 10 times udt_pkt_size

The value must be greater than udt_pkt_size.

udt_rcv_buf_size

Buffer size of UDT at the destination

10485760 KB

Approximately 10 times udt_pkt_size

The value must be greater than udt_pkt_size.

Set the properties in the source and destination vCloud Connector nodes.

1

Log in to the node console as admin.

The default password is vmware.

2

Change directories to /usr/local/tcserver/vfabric-tc-server-standard/agent/webapps/agent/WEB-INF/spring/appServlet.

3

Open the management.xml file in a text editor.

4

Search for property name="udtProperties".

5

Edit the properties.

6

Save and close the file.