Has anyone placed a SQL database on a filer and seen a significant performance increase of 10% or more or a performance decrease of 10% or more?

Our initial test of a source change management application using a SQL database on our filer showed a significant decrease in performance to the tune of 2-3 times slower than a local storage array. We understand ours wasn't an apples to apples comparison but we weren't expecting the difference to be this great.

Has anyone else experienced a similar story where they have seen negative/positive results they would like to share?

Our filer is a model F840.