tenant subscribes to use one multi tenant application and the sla may be saved in the metadata of the tenant according to one embodiment data volume of the tenant folder may be set based on the sla according to one embodiment of the present invention a physical location where the tenant folder is located may be assigned based on the sla which location may be a physical medium shared with other tenants or a physical medium dedicated to the tenant for example a high speed diskette etc at step 403 a file in a multi tenant application folder is copied to the tenant folder it may copy a selected file for example an application level file a tenant specific file or a pre build file which may be modified by the tenant for example a customized configuration file according to one embodiment if the selected file is an application level file only a link directed to a file of a multi tenant application folder is established in the tenant folder at step 405 an access control list acl of the tenant folder is established wherein the acl prescribes access rights to the file for example it is prescribed in the acl that the tenant only performs read operation to an application level file of a link in the tenant folder fig5 schematically illustrates examples of some acls in the form of a list for example the tenant account of t 1 is u201c abc u201d which tenant.