Solaris

We are having a server running zfs root with 64G RAM and the system has 3 zones running oracle fusion app and zfs cache is using 40G memory as per

kstat zfs:0:arcstats:size. and system shows only 5G of memory is free rest is taken by kernel and 2 remaining zones.

Now my problem is that fusion guys are getting not enough memory message while starting their application due to top and vmstat shows 5G as free memory. But i read ZFS cache releases memory as required by the application so why fusion application is not starting up. Is there some we can do to decrease the ARC Cache usage on the fly without rebooting the global zone ?

is the zone capped with memory? is it a new problem or was this the problem all the time? did anyone change settings on the server?

No nothing has been changed on the server .. The host is up and running since 250 days and we are not using rcapd for memory capping though we have enabled max-shm and max-locked memory for other zones but not for this ( problematic) zone. We did remove the resource capping on this zone