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MQSeries.net Forum Index » IBM MQ Installation/Configuration Support » Impact of setting KeepAlive to a low value?

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beernink
PostPosted: Tue Mar 12, 2002 4:26 pm    Post subject: Reply with quote

Newbie

Joined: 15 Jan 2002
Posts: 8
Location: NZ Post
Anyone who can tell me what impact there is from changing the TCP/IP KeepAlive value down to say 1 minute or 30 seconds? Under Windows it defaults to 2 hours, which is not much use if you have told MQ to use KeepAlive to detect a missing in action remote server.

Info on KeepAlive can be found at http://support.microsoft.com/default.aspx?scid=kb;EN-US;Q120642 (how to change the KeepAlive value in the Registry) and http://www-4.ibm.com/software/ts/mqseries/support/tandts/keepaliv.html (MQ discussion on the benefit of using KeepAlive).

The above info does not give an idea however what performance penalties there are from lowering the KeepAlive value.


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kolban
PostPosted: Tue Mar 12, 2002 5:26 pm    Post subject: Reply with quote

Grand Master

Joined: 22 May 2001
Posts: 1072
Location: Fort Worth, TX, USA
Have you considered using the heartbeat attributes of the MQSeries channel definitions? These are basically an MQSeries level hearbeat mechanism and may be specified on a per channel basis.

By using this attribute, if nothing has been heard over the channel in a configurable period of time, the queue managers attempt to send a "hello, are you there?" very small message. If after a few attempts and still no response, the channel is considered lost and the connection broken and/or re-attempted to create.
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