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Operating Systems AIX Question about HACMP for active-active mode Post 302366680 by qiulang on Friday 30th of October 2009 05:44:19 AM
Old 10-30-2009
Thanks for the answer.

Actually what I did not understand before was what was the value of running 2 instances of the same application on one node during the failover? If the resource group contains the same application on both nodes, why not just make takeover not happen here ? Because from the client point of view, the service still exists while running two same instances on one node may make the node overloaded.

As zxmaus pointed out that two same instances can server different purposes(say, database 1 is used for trading, database 2 for reporting). I think that makes sense. But if two instances serve the same purpose I still don't see the value in it.
 

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passenger-status(8)					      Adminstration Commands					       passenger-status(8)

NAME
passenger-status - inspect Phusion Passenger's internal status SYNOPSIS
passenger-status [pid] DESCRIPTION
passenger-status looks at the current status of a Phusion Passenger installation. It will locate Phusion Passenger automatically if it is running and will give you a list of instances if there is more than one Phusion Passenger instance running. You can then select the instance by specifying the relevant PID on the command line. The general information section shows the following details: max The maximum number of application instances that Phusion Passenger will spawn. This equals the value given for PassengerMaxPoolSize in the configuration. count The number of application instances that are currently alive. This value is always less than or equal to max. active The number of application instances that are currently processing requests. This value is always less than or equal to count. inactive The number of application instances that are currently not processing requests, i.e. are idle. Idle application instances will be shutdown after a while, as can be specified with PassengerPoolIdleTime in the configuration. The value of inactive equals count - active. The applications section shows each application instance, which directory it belongs to. The sessions field shows how many HTTP client are currently being processed by that application instance. OPTIONS
pid The process ID of the Phusion Passenger instance you want to look at SEE ALSO
passenger-memory-stats(8), ps(1), top(1) User guide at http://www.modrails.com/documentation.html AUTHOR
Phusion Passenger is written by Phusion (http://www.phusion.nl) "Phusion" and "Phusion Passenger" are trademarks of Hongli Lai & Ninh Bui. This manual page was written by Neil Wilson <neil@brightbox.co.uk> for the Ubuntu project (but may be used by others). Phusion Passenger 2.0 passenger-status(8)
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