[devttyeu]

I don't think most people grasp how abstractly high even 1 DWPD is compared to enterprise HDDs. On the enterprise side you'll often read that a hard drive is rated for maybe 550TB/year, translating to 0.05~0.1 DRWPD [1] (yes, combined read AND write) and you have to be fine with that. (..yeah admittedly the workloads for each are quite different, you can realistically achieve >1 DWPD on an nvme with e.g. a large LSM database).

What makes NVMe endurance ratings even better (though not for warranty purposes) is when your workload has sequential writes you can expect much higher effective endurance as most DWPD metrics are calculated for random 4k write, which is just about the worst case for flash with multi-megabyte erase blocks. It's my understanding that it's also in large part why there is some push for Zoned (hm-smr like) NVMe, where you can declare much higher DWPD.

* [1] https://documents.westerndigital.com/content/dam/doc-library...

[zozbot234]

I assume that flash translation layers use LSM-like patterns underneath to cope with small random writes. The best case for flash with a good translation layer is data that can be erased/discarded in bulk, since this minimizes write amplification. This is close enough to the "large sequential writes" case but not necessarily equivalent.