Apple's custom NVMes are amazingly fast – if you don't care about data integrity

Re:Apple's custom NVMes are amazingly fast – if you don't ca... by marcan_42 on Thursday February 17, 2022 @04:51AM (#30371329)

On this NVMe, flushing is slower than on some spinning disks, so it apparently matters.

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Re:Apple's custom NVMes are amazingly fast – if you don't ca... by shellac on Thursday February 17, 2022 @05:22AM (#30371547)

Yes, I would have skipped the fsync thing, which carries a lot of baggage, and concentrate on this.

Btw, are you sure those spinning disks are actually flushing to rust? Caches all the way down... ;-)

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Re:Apple's custom NVMes are amazingly fast – if you don't ca... by marcan_42 on Thursday February 17, 2022 @05:47AM (#30371705)

I mean, typical seek time on rust is O(10ms) and these controllers are spending 20ms flushing a few sectors. Obviously rust would do worse if you have the cache full of random writes, though. The problem here is the huge base cost.

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