A Configuring Hafm Through A Firewall; Polling Mode; Decreasing Login Time; Forcing A Client To Polling Mode - HP 316095-B21 - StorageWorks Edge Switch 2/24 User Manual

A Configuring HAFM through a firewall
Networks can use a virtual private network (VPN) or firewall to prohibit communication between
servers and clients. This appendix provides optional procedures for configuring HAFM client and
server applications to function across remote networks through a firewall.
This appendix describes the following topics:
• Polling mode, page 169
• TCP port numbers, page 171

Polling mode

Generally, the server calls the client when it has new data. If the client uses firewall technology, the
server may be unable to reach the client. In this case, the HAFM application automatically detects
the network configuration and runs the client in polling mode.
When the client is running in polling mode, the server queues up the data and the client
periodically (approximately every 5 or 10 seconds) checks in and retrieves the data. The original
two-way communication is transformed into one-way client-controlled communication, allowing
passage through firewalls.

Decreasing login time

When a client attempts to log in to a server, the server typically calls back to verify communication.
In a firewall situation, this call fails and the server then treats the client as a polling client. It may
take up to 45 seconds for this call-back to fail. You can configure a polling parameter in client and
server batch files to identify the client as a polling client. This causes the server to skip the call-back
step and shortens the login time.

Forcing a client to polling mode

To force a client to be a polling client, add the -Dsmp.callback.passive parameter to the
following files in the HAFM 8.x\bin directory (typically in c:\Program Files\HAFM
8.x\bin):
• Client portion of the HAFM_sc.bat file
• HAFM_c.bat file
The HAFM_sc.bat file starts both the client and server and is installed on a computers with the
HAFM appliance software. The HAFM_c.bat file starts the client only and is installed with the
client software.
Example:
This example shows the edited files with the additional parameter in bold. This parameter only
affects the specified client.
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