Cache Hit Ration on SAN

We recently moved a database to the SAN and it is not performing so well. Watching performance logs I have noticed that the Cache hit ratio is only around 60%. I checked memory right away and that seems to be fine. Plenty of physical memory available and only about 40% is committed to use.

The SAN is currently configured to have 200 mg of Read Cache, I would imagine that is a little low, but not sure.

This is the first time we have ever put a database on the SAN so our knowledge of optimization is lacking. Any ideas on how to improve performance would be helpful.

Thanks muchWhat do you mean "plenty" and what edition of OS and SQL are you running?|||By pleanty I mean 650000 K. We are running Windows 2000 and SQL 2000.

Thanks much.|||650MB is plenty? OK then. And I know that you were running some sort of Windows (SQL doesn't run on anything else) with some version of SQL. The question was: "...what edition of OS and SQL?"|||Try this link for some performance testing info (http://www.devarticles.com/c/a/SQL-Server/How-to-Perform-a-SQL-Server-Performance-Audit/1/)|||i screwed up
get more ram|||I don't think Ram is the problem. We have a totol of 2GB, with 650MB remaining when the server is running slow. Wouldn't remaining RAM drop lower than that if we needed more? If I watch Pages/sec it rarely goes above 1. Watching SQL Memory, the target memory is always equal to the total memory. I think this is a problem with IO on the SAN.

Thanks much