Here is our hands-on look at why this "vintage" architecture is finding a second life in high-security and mainframe modernization projects. At its core, the 620 is a mid-range enterprise storage controller. It bridges the old world (ECKD, CKD tracking, FICON channels) with the new world (Fibre Channel, SCSI, and even limited S3 object staging).
But if you need storage that will survive a solar flare, a power surge, and a junior admin dropping a coffee on the controller—while still talking to a mainframe from 1985—nothing else comes close. dasd 620
April 14, 2026 Topic: Legacy Storage Architecture Here is our hands-on look at why this
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The 620 supports up to 16 channel paths. In our benchmark, we yanked a live Fibre Channel cable during a batch job. The system didn't stutter. The secondary path took over within one I/O cycle. For banks processing end-of-day settlements, this is the difference between a footnote and a lawsuit. But if you need storage that will survive