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checking the heartbeat of the online user

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Old 10-11-2002
Question checking the heartbeat of the online user

Can anyone please tell me how can i check the availability of the online user in a client-server environtment.
This is for a program where lakhs of client are connected to the server and the server has to check the availability of the every client in every minute.
So polling every client is not a good option.
Can anyone help me for the solution.

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ocfs2_hb_ctl(8) 						OCFS2 Manual Pages						   ocfs2_hb_ctl(8)

ocfs2_hb_ctl - Starts and stops the OCFS2 heartbeat on a given device. SYNOPSIS
ocfs2_hb_ctl -S -d device service ocfs2_hb_ctl -S -u uuid service ocfs2_hb_ctl -K -d device service ocfs2_hb_ctl -K -u uuid service ocfs2_hb_ctl -I -d device ocfs2_hb_ctl -I -u uuid ocfs2_hb_ctl -P -d device [-n io_priority] ocfs2_hb_ctl -P -u uuid [-n io_priority] ocfs2_hb_ctl -h DESCRIPTION
ocfs2_hb_ctl starts and stops the heartbeat on a OCFS2 device. Users are strongly urged not to use this tool directly. It is automatically invoked by mount.ocfs2 and other tools that require heartbeat notifications. The tools accepts devices to be specified by its name or its uuid. Service denotes the application that is requesting the heartbeat notifi- cation. OPTIONS
-S Starts the heartbeat. -K Stops the heartbeat. -I Prints the heartbeat reference counts for that heartbeat region. -d Specify region by device name. -u Specify region by device uuid. -n Adjust IO priority for the heartbeat thread. This option calls the ionice tool to set its IO scheduling class to realtime with scheduling class data as provided. This option is usable only with the O2CB cluster stack. -h Displays help and exit. SEE ALSO
mkfs.ocfs2(8) fsck.ocfs2(8) tunefs.ocfs2(8) mounted.ocfs2(8) ocfs2console(8) debugfs.ocfs2(8) AUTHORS
Oracle Corporation COPYRIGHT
Copyright (C) 2004, 2010 Oracle. All rights reserved. Version 1.4.3 February 2010 ocfs2_hb_ctl(8)

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