integrating existing file server with EP6SP9

hello everyone

we are implementing EP6 SP9 portal for our SBU and we need to integrate our existing file server with portal in which we can upload documents and download existing documents.

do we need to use content management to access this file server using the file system repository manager or it can be done in some other way

If theres an alternate way to do this, kindly explain what needs to be done.

Kindly help

Thanking you

Anurag