If you're running a mainframe (and many enterprises still are), then one of your biggest expenses will be the monthly licence charges (MLCs) imposed by IBM. Reducing those costs could make a considerable difference, but making those calculations can be tricky.
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In a blog post examining the recent release of an MLC cost reduction calculator from BMC, Forrester analyst Mark Batrick notes that while these tools can be useful, they don't always consider the specific configurations used within a business:
One word of caution; you will need to include your IT colleagues in reviewing the results as there may be some mitigating circumstances whereby you can't make the changes the tool suggests.
Modern mainframes are rarely isolated, and interdependencies with other systems need to be handled carefully.
Forrester Blogs [BMC]