Editing Antifeatures
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This was called a "screwdriver upgrade" -- on the IBM mainframes I saw upgraded the DIP switch was flicked in place and the customer was fully aware of the process. It depends upon the charging model as to if this was a anti-feature. For example, most IBM customers leased the mainframe per-MIPS. Upon requiring more MIPS they much preferred a screwdriver upgrade rather than the multi-year planning required for "forklift upgrade", where the entire machine had to be replaced and sometimes the software rebuilt (eg, the new mainframe hardware may have required a move from MVS/XA to MVS/ESA), with extended downtime and significant risk of deployment failure. Usually contracts for IBM-compatible mainframes explicitly requested the range of MIPS for the hardware, a mainframe with a lesser range being penalised as that implied a major upgrade would be required sooner. | This was called a "screwdriver upgrade" -- on the IBM mainframes I saw upgraded the DIP switch was flicked in place and the customer was fully aware of the process. It depends upon the charging model as to if this was a anti-feature. For example, most IBM customers leased the mainframe per-MIPS. Upon requiring more MIPS they much preferred a screwdriver upgrade rather than the multi-year planning required for "forklift upgrade", where the entire machine had to be replaced and sometimes the software rebuilt (eg, the new mainframe hardware may have required a move from MVS/XA to MVS/ESA), with extended downtime and significant risk of deployment failure. Usually contracts for IBM-compatible mainframes explicitly requested the range of MIPS for the hardware, a mainframe with a lesser range being penalised as that implied a major upgrade would be required sooner. | ||
Reading this makes my decisions easier than tanikg candy from a baby. | |||
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