VAXft series

The VAXft series (VAX fault tolerant) were a series of fault tolerant VAX computers produced by DEC. They used redundancy to produce reliable operation: units contained dual CPUs and other components, mounted in separate backplanes in the cabinet, with a 'crosslink cable' running between the CPUs. The cable allowed hardware in the two CPUs to check, on an instruction-by-instruction basis, that they were producing identical results.

Some of the VAXft's fault tolerance features are implemented in software, the VAXft System Services software, which is needed to support those features.

VAXft models included:

• VAXft Model 110
• VAXft Model 310
• VAXft Model 410
• VAXft Models 610 and 612
• VAXft Model 810

Further reading

• VAXft Systems System Technical Description (EK-VXFT1-TD; not online)
• VAXft Systems Guide to VAX Fault Tolerant Systems
• William F. Bruckert, Carlos Alonso, James M. Melvin, Verification of the First Fault-tolerant VAX System, Digital Technical Journal, Volume 3, Number 1, Winter 1991 (pp. 81-87 of the PDF)

External links

• VAXft Systems Owner's Manual (EK-VXFT1-OM.004)
• VAXft Systems Configuration Guide (EK-VXFTB-PG-002)
• VAXft Systems Mini-Reference Guide (EK-VXFT1-HR.003)