SAN disadvantages
Regardless of many advantages being mentioned, there are also some limitations or disadvantages in SAN technology. Although the concept has been known for quite some time but the implementation still new to most of organizations. The main limitation is the lack of interoperability between SAN fiber networks from different vendors. Software tools or utilities that are distributed with SAN hardware are limited to managing a single vendor's SAN components. The idea of merging Fibre Channels switches from multiple vendors is not currently possible although current standard efforts; interoperability testing and multivendor development projects are produced to overcome these obstacles within the next 12 months.
That is why most 'corporate' SAN operations are limited to specific applications or functions such as LAN-free backup, serverless backup, disaster recovery, and storage consolidation or storage merging in Windows NT and UNIX environments.