what is the maximum size limit for a sharepoint content database when it configured with RBS . i mean max limit for content database .mdf file and rbs san / nas folder
No different than if you were not using RBS. RBS data 'counts' against database size.
Microsoft has defined some usage scenarios and put recommended limits behind:
- 200GB for general usage scenarios
- 4TB for all usage scenarios
- No explicit limit for document archive scenarios
It is important to understand that the requirements increase, as DB-size increases.
RBS does not increase the storage limits of content databases. All limitations still apply to RBS-enabled content databases. RBS is intended to lower storage costs by allowing you to store large read-intensive BLOBs on less expensive drives. For example, if you have 150 GB of RBS data and you have a content database that is 70 GB, this still exceeds the recommended limits of 200GB for a general usage scenario.
Reference: Deciding to use RBS in SharePoint Server