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| Tech Update
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IBM z/OS--when to migrate to 64-bit
Migration considerations
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By Rob Schafer
November 7, 2002
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Our research indicates IBM's current z/OS enhancements are largely targeted at this mainframe future dominated by large-scale users. Indeed, with 5,000 MIPS single systems a reality by 2007, we project users will increasingly configure applications to be contained in and optimize the simplicity and efficiency of large processor subsystems. Nonetheless, large applications will necessarily "touch" multiple logical partitions spread across several such systems, requiring tight application integration via robust intersystem communications. Indeed, z/OS R1.4's 64-bit support for workloads with large memory requirements, HiperSockets for improved inter-partition communications, and IRD (dynamic resource balancing) are examples of IBM setting the stage for the mainframe's growing sweet spot: very large-scale, high-volume, and high-availability computing.
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64-bit mode: not if, but when
The bottom-line question of z/OS migration revolves exclusively around its 64-bit capabilities. Thus, users should evaluate the costs associated with a full 64-bit deployment (e.g., more costly zSeries hardware and subsystem software) versus its benefits, which the user can/will exploit in the near term (i.e., within six months of deployment). Users should view the zSeries hardware platform as synonymous with 64-bit mode, because we see no reason to be on the platform and remain in 31-bit mode. In this context, we project that the rate of migration to z/OS will accelerate dramatically during the next 12 to 24 months. Specifically, we believe that, by the end of 2003, more than 80 percent of large system users that have already committed to zSeries hardware will migrate to 64-bit mode. Current G5/G6 users will be slower to migrate, as they face a more daunting business case to justify 64-bit z/OS. The good news is that there is no real rush for these trailing-edge users, as IBM will support OS/390 R2.10 through "at least" September 2004, by which time the old G5/G6 platform will be over seven years old and ready for the landfill.
Business impact
Better understanding of the business implications of server platform evolution will drive higher-quality, more business-oriented strategic planning and yield a more flexible, cost-effective infrastructure.
Bottom line
Large users already invested in zSeries hardware should move sooner than later to 64-bit z/OS. G5/G6 users should base the 64-bit z/OS (and prerequisite zSeries) migration on a solid, near-term business case for 64-bit mode.
IBM Mainframe: When to Bite the 64-Bit Bullet
Originally published October 31, 2002
By Rob Schafer
When will your company migrate to a 64-bit z/OS environment? TalkBack below or e-mail us with your thoughts.
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