I wish there was a simple answer, but there isn't.   It depends on your workload.  Each IO type and the IO size is going to make a big difference in the maximum IOPs each component can achieve.

Watching your response times, and utilizations is probably the best way to determine storage health.

Have you tried talking to your Account Representative from EMC? EMC did help us in putting together a bundle of performance reports/charts (almost 200+ pages of PDF Doc) for our Array when we had a performance  related issue, recently.  The charts were self explanatory. We provided the start date and end date for them to analyze and we compared it with the suspected time window to see how things looked. It did take around a week for EMC to collect all the logs from our site and put this report together.

[Its good to have something which looks as sophisticated and colorful as the one that they created. After we presented it to the DBAs, APP Owners and System Administrators nobody from those teams came back to us with performance related issues. - at least not as frequently]

Well Quincy is right there isnt a simple answer but there are few things you can keep track of:

1) Anything red/orage in SPA dashboard is not good.

2) Anything above 50% is not a good sign.

3) I dont like to see pin pointed graphs, like to see smooth curves

regards,

SAurabh

i have a symmetrix and utilization is not red/orange and below 50% but I recieve alot of read misses on some storage groups, anything i should be worried about

thanks

There is nothing wrong with read misses, they are normal for some workloads.