Solaris memory usage
Installed Solaris 11.1 and created/booted a single zone. prstat -Z shows the global using about 400 mb of memory and the zone using about 60 mb. Yet top shows that 50% of the 8 gig of available ram used. Is it safe to assume that the remainder is used up by the file system cache? I've read that ZFS implements an aggressive caching algorithm but this seems a tad excessive on an idling system.
Since my goal is really to use the zones as a playground for Oracle databases on ASM would it be advisable to limit the filesystem cache to a really small amount, such as 0.5 gig?
I have read several ZFS tuning guides available on the Internet but most of them deal with tuning ZFS to store the database files on the filesystem and little if any when using ASM.