08-22-2012
Good advice by zaxxon. Of course it could be a myriad of other reasons: network congestion, switch(router,hub, ....) bottleneck, broadcast storms, or even the temporary drop of bandwidth in a line.
Many years ago, i had a Laser-link as part of my network infrastructure, which mysteriously dropped in bandwidth every day at around 10:30 only to get back to speed at about 14:30 again. Turned out there was a cantina beneath the line of sight, which started to cook at this time and their exhaust air along with the steam from the cooking disturbed the connection, which throttled the bandwidth. It took about 2 months to find this one out, because everybody was busy looking at their network analyzers and nobody looked out the window.
In problems like this the only way is to meticulously describe the "chain of events" (or participating parts) and start to falsify every part of this until one hits the problematic one. And - see above - sometimes it helps to get some fresh air. ;-))
I hope this helps.
bakunin
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ocf_pacemaker_ping
OCF_PACEMAKER_PING(7) Pacemaker Configuration OCF_PACEMAKER_PING(7)
NAME
ocf_pacemaker_ping - node connectivity
SYNOPSIS
[OCF_RESKEY_pidfile=string] [OCF_RESKEY_dampen=integer] [OCF_RESKEY_name=string] [OCF_RESKEY_multiplier=integer]
[OCF_RESKEY_host_list=string] [OCF_RESKEY_attempts=integer] [OCF_RESKEY_timeout=integer] [OCF_RESKEY_options=string]
[OCF_RESKEY_failure_score=integer] [OCF_RESKEY_debug=string] ping [start | stop | reload | monitor | meta-data | validate-all]
DESCRIPTION
Every time the monitor action is run, this resource agent records (in the CIB) the current number of ping nodes the host can connect to. It
is essentially the same as pingd except that it uses the system ping tool to obtain the results.
SUPPORTED PARAMETERS
OCF_RESKEY_pidfile = string [/ping-]
PID file
OCF_RESKEY_dampen = integer [5s]
Dampening interval
The time to wait (dampening) further changes occur
OCF_RESKEY_name = string [pingd]
Attribute name
The name of the attributes to set. This is the name to be used in the constraints.
OCF_RESKEY_multiplier = integer []
Value multiplier
The number by which to multiply the number of connected ping nodes by
OCF_RESKEY_host_list = string []
Host list
The list of ping nodes to count.
OCF_RESKEY_attempts = integer [2]
no. of ping attempts
Number of ping attempts, per host, before declaring it dead
OCF_RESKEY_timeout = integer [2]
ping timeout in seconds
How long, in seconds, to wait before declaring a ping lost
OCF_RESKEY_options = string []
Extra Options
A catch all for any other options that need to be passed to ping.
OCF_RESKEY_failure_score = integer []
failure_score
Resource is failed if the score is less than failure_score. Default never fails.
OCF_RESKEY_debug = string [false]
Verbose logging
Enables to use default attrd_updater verbose logging on every call.
AUTHOR
Andrew Beekhof <andrew@beekhof.net>
Author.
Pacemaker Configuration 06/10/2014 OCF_PACEMAKER_PING(7)