"Linux is a key to the IBM mainframe new-workload strategy," said Charlie Burns, a vice president of Westport, Conn.-based Saugatuck Technology Inc.The strategy: Mainframe for everyone
The strategy is simple: Big Blue has set its sights on establishing the mainframe and Linux as the platform of choice for new workloads—predominantly with a series of deep discounts made possible by Linux, which is freely available, Burns said.
So far the approach has worked. According to Saugatuck's research, in 2007 approximately 25% of all System z capacity being shipped to customers is designated for Linux workloads. "These measures of demand are evidence of the growth in usage of mainframes for both traditional and new, nontraditional workloads," Burns said.
The price is right too. Cost could make the mainframe an attractive must-have alternative for IT managers who previously had not considered it, Burns said. When purchasing or upgrading a System z, for example, a customer can request one or more processors for exclusive use by workloads running on Linux. These Linux-only processors are priced approximately 90% lower than a processor for a traditional mainframe workload. The 90% number may seem unbelievable, but it is exactly what IBM offers for a line of specialized mainframe engines. There are also specialized database and Java application engines offered at a steep discount. "It is an interesting phenomenon that IBM would discount that much," Burns said, "but they are a company that is very interested in getting people to understand that they believe this is a great platform."The target for IBM's Linux-on-the-mainframe push: greater adoption of Linux among large data centers. If a company with 100 to 150 x86 servers is growing by 10 or more servers every month hasn't looked into mainframes yet, it should, Burns said. If a mainframe is already in-house, the 90% discount on a Linux engine means users are getting the additional Linux functionality for next to nothing. The benefits
Burns said that existing mainframe users should begin to evaluate a move for all non-mainframe workloads to their mainframe platforms. Customers without mainframes that meet the data center size and skill set criteria mentioned above should evaluate hardware costs and the benefits of migrating non-mainframe workloads to the mainframe (For more on this evaluation process, see the sidebar "An elementary mainframe roadmap.")
"The benefits of such migrations are improved workload management, performance, availability and security, coupled with reduced costs for electrical power, cooling, floor space and support staffs," he said.
Other benefits include the mainframe's ability to "upgrade in place," Burns said. For example, with System z, data center managers can install additional capacity and/or upgrade to a newer technology without adding another server. "For rapidly growing workloads like [Software as a Service], this can yield substantial savings, especially since capacity can be added dynamically and nondisruptively as the workload grows," he said.
Additionally, Saugatuck research has shown that mainframes provide higher levels of security. In 2003, System z was certified as Evaluation Assurance Level 5, the highest-level security certification of any server platform. The Evaluation Assurance Level (which ranges from EAL1 through EAL7) of an IT product or system is a numerical grade assigned upon completion of a Common Criteria security evaluation, an international standard created in 1999. IT managers can also opt to install more than one Linux processor and, with that configuration, have a production server, development server, backup server and database server all consolidated on the same box. "From an IT manager's perspective, that's heaven," he said.No turnkey migration
Still, IT shops have to have the skills in place for a smooth mainframe migration. "If they have Unix skills right now, then that is an easy move to Linux," Burns said. "If not, and they have only Windows servers, then they need to understand this is not an easy transition and there's work involved."
That's because many Windows applications will "operate" on a Linux platform, but once they are migrated over, the vendor that sold the application will no longer support it. If IT managers decide to migrate, they must weigh that risk, Burns said.
"If you are not currently using Linux then you have to convert to it," Burns said. "Converting workloads from Windows to Linux isn't impossible but it's a formidable task. As with any migration, you'll also have to make the transition with your support staff; what they're trained on, what tool they will use, how they'll back up the database, etc."
Despite these concerns, however, Linux is still widely viewed as a mission-critical platform and will control 50% of all mission-critical operations in the data center by 2011, according to a Saugatuck report published earlier this year.
"By adopting [the specialty-engine approach], the IBM mainframe platforms have succeeded in a key area where non-mainframes have failed. The approach enables non-mainframe workloads to benefit from many of the capabilities which had been exclusively experienced by traditional mainframe workloads," Burns said.
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