[cm2187]

Would be curious of whether this is before or after the cache. My understanding is that, for instance, newer Samsung QLC SSDs are slower but they include a very fast SLC cache, and in practice you spend your time in the cache unless you are copying >15GB files.

[derefr]

> unless you are copying >15GB files.

Or, presumably, using them in a miltitenant SAN or DBMS where the SSD’s pipeline is full of concurrent random IOPS to more than 15GB of hot data.

[wtallis]

SLC caching is only used on consumer SSDs, and on most drives it is largely or exclusively a write cache. Consumer QLC drives are pretty much the only ones that prefer to retain data in the SLC cache to accelerate read performance, rather than flushing it during idle times to prepare for the next burst of writes.