Coyote Point Systems Equalizer GX Series, Administration Manual

Page: 467 / 866

To avoid interrupting user sessions, make sure that a server to be shut down or deleted from a
cluster no longer has any active connections. When a server’s initial weight is zero, Equalizer will
not send new requests to that server. Connections that are already established continue to exist
until the client and server application end them or they time out because they are idle.
To shut down servers in a generic TCP or UDP (L4) cluster, you can set the server’s weight to zero
and wait for the existing connections to terminate. However, you need to quiesce servers in HTTP
and HTTPS (L7) clusters to enable servers to finish processing requests for clients that have a
persistent session with the server.
When you quiesce a server, Equalizer does not route new connections from new clients to the
server, but will still send requests from clients with a persistent session to the quiescing server.
Once all the persistent sessions on the server have expired, you can set the server’s initial weight
to zero; then Equalizer will not send additional requests to the server.
Note that while a server instance is quiescing, it will still receive new requests if all of the other
server instances in a server pool are unavailable . This behavior prevents any new requests from
being refused, but may lengthen the time needed to terminate all active persistent connections.
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Equalizer Administration Guide