134: The Clunky NVMe Interface
One PHP Apocalypse later, here’s OpenZFS Mastery on NVMe.
The slowest, most complicated, and most error-prone part of an SSD is the Flash Translation Layer. Pretending to be as stupid as a 1980s spinning disk is hard labor. Non-Volatile Memory Express (NVMe) uses very similar hardware but drops this clumsy pretense, instead offering an interface designed for fast flash memory. NVMe itself is a physical interface specification like SATA or SCSI/SAS, but designed for extremely fast access.
Where spindles and SSDs have one queue per disk, NVMe allows 65,536 queues per device, of 65,536 commands…
The skinny
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