Server cluster and availability indexes
Tags :Technical
OK, this used to make sense and actually have
some value. But right now it seems to be working against me in 6.5.3
at a customer site. Now we have to include the expansion
factor into the equation.
These two together only measure the response time, the client could
see more. So how is it beneficial? So they are saying the indexes
help decide which server for load, but the client could see worse. Well
I was seeing both of the indexes go up and down like stocks before and
after a merger.
You can adjust the indexes and expansion factor as you wish, but they were
not high enough to begin with. So we started that morning with an
unstable 6.5.1 server cluster, with availability somewhere in the 40/14
range with the 40 being the internal server. After the upgrade to
6.5.3 we saw the availability jump to 75/30 on normal load. This
tells me there was some improvements along the way in stability and scaling.
Yes, they do use iNotes very sparingly on the outside server. Most
load is the clients accessing mail and applications.
What is the point to all this? Well
the expansion factor stayed low on the outside server, around 7-8 but jumped
to as high as 60 when it was the only server and we were upgrading the
internal one.
My guess is that the outside server was
sending traffic randomly between the internal NIC and external NIC to talk
to the same server. But wait, you say! Chris, you said one
was internal and one was external. Due to their architecture, you can get
to the outside server from inside to let them have some sort of cluster.
But, since the connection records use DNS, it reads the external
IP address and tries to go out through the proxy and Internet to connect
to the server. The organization does not run internal DNS and relies
on the ISP.
I verified they did not have any ini parameters
to adjust the availability and help regulate load. They did not and
were allowing Domino to decide the factor on the fly for them at each polling.
To make this shorter, we decided to let it sit this weekend and get a better
range of availability with a couple days of usage instead of relying on
the few hours after the upgrades.
More on Monday or Tuesday on this topic
then.
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On Saturday, February 26th, 2005 by Chris Miller
