How to increase Client Session Info Cache

I have configured 3 nodes in clustering with openfire using hazlecast. I have used the <awsenabled="true"> option

The problme is that session page is crashing on all three nodes and the problem seems to be with "Client Session Info Cache" which is at 1400%.

My question is how can I increase the amount of Client Session Info Cache, whats is the relevant system property?

Thanks

Atif