What are some of the challenges of mixing mainframe storage and open systems storage?
First, the operating systems that run on mainframes are open, including OS/390, z/OS, Linux on S/390, z/VM and VSE. Few people realize that OS/390 is a UNIX-branded operating system, and complies with many of the open industry standards that other platforms comply with. IBM prefers the term distributed systems, relating to servers that have not yet been consolidated onto a mainframe. One challenge is that the Storage Area Network (SAN) technology that IBM invented in the early 1990’s is based on ESCON, and industry standard serial protocol. The SAN second generation is Fibre Channel Protocol (FCP), which is based on SCSI.