Hitachi announced the 730FT and 750FT fault-tolerant UNIX servers in January 1995 as part of its 3500 series. The models began shipping in July 1995. The servers’ fault-tolerant functionality was derived from a quad processor redundancy (QPR) architecture, which had two redundant-processor systems (for a total of four processors).
The 730FT and 750FT permitted system expansion and component swapping without system interruptions. They also maintained API and ABI compatibility with 3500 series/3050RX group models.
| 730FT | 750FT | ||
|---|---|---|---|
| Processors | PA-7100 80MHz×4 | PA-7100 100MHz×4 | |
| Cache memory | 512KB/processor×4 | 2MB/processor×4 | |
| Main memory capacity | 64MB-1024MB×2 | ||
| Disk capacity | 2.1GB-567GB×2 | ||
| Standard equipment | Ethernet | 1 | |
| RS-232C | 4 | ||
| DAT | 2 | ||
| Expandable I/O slots | 4 x 2 (standard) or 7 x 2 (optional) | ||
