Configuring hafm through a firewall, Polling mode, Decreasing login time – HP StorageWorks 2.32 Edge Switch User Manual
Page 199: Forcing a client to polling mode, A configuring hafm through a firewall
HA-Fabric Manager user guide 199
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
Generally, the server calls the client when it has new data. If the client uses firewall technology, the
server can 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 can 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. The 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.
The following example shows the edited files with the additional parameter in bold. This parameter
only affects the specified client.