topic Re: CSS11500 - keepalive timeout in Application Networking

CSS11500 - keepalive timeout

sthon-dbsys — Fri, 08 Oct 2004 09:46:12 GMT

1. what is the default value of the keepalive timeout. (after which time the service goes dying, if the keepalive packet is not responded)

2. Can I change the keepalive timeout by configuration ?

thanks in advance

sascha

Re: CSS11500 - keepalive timeout

Gilles Dufour — Mon, 11 Oct 2004 10:48:00 GMT

The timeout is the frequency minus 2 seconds.

If you change the frequency it will adjust the timeout.

Gilles.

Re: CSS11500 - keepalive timeout

sthon-dbsys — Mon, 11 Oct 2004 11:25:18 GMT

I am wondering about this implementation. To my better understanding.

If I configure "keepalive frequency 15".

The timeout value is 13 sec.

So the CSS send it´s keepalive and is waiting 13 sec for the keepalive answer packet ? If the keepalive is not answered after 13 sec the service went to dying ?

It think this value ist very high.

sascha

Re: CSS11500 - keepalive timeout

Gilles Dufour — Tue, 12 Oct 2004 10:33:03 GMT

If you select a frequency of 15, it means clearly you can allow 15 seconds before detecting a service is down.

So why only wait 3 seconds or 5 or 7 for the response ?

We wait until frequency - 2.

That does not impact the frequency of keepalive.

That is, if we sent a kal at time T and we do not get a response at T+13 seconds,

we will mark the service dying

But the next keepalive is not sent at T + 13 + 15, it is still sent at T + 15.

If you have a kal retries of 3, it really takes 3 x 15 = 45 seconds to mark the service down.

If this is too much for you, just adjust the frequency.

Regards,

Gilles.

Re: CSS11500 - keepalive timeout

sthon-dbsys — Tue, 12 Oct 2004 11:35:19 GMT

thanks for the info.

all clear now