The question is how low is the latency. Is it lower than Intel Optane 900p/905p? Maybe I'm upgrading from 3x 900p 480GB, if it's actual faster.

At the latencies nand and xpoint actually are, you aren't seeing anything related to them in realworld performance usage.

Astyanax:

At the latencies nand and xpoint actually are, you aren't seeing anything related to them in realworld performance usage.

And if latency is that important to you, use a RAM disk.

Astyanax:

At the latencies nand and xpoint actually are, you aren't seeing anything related to them in realworld performance usage.

You know this for all application and scenarios in the world? If so, you're a GOD 😀

schmidtbag:

And if latency is that important to you, use a RAM disk.

No

nizzen:

You know this for all application and scenarios in the world? If so, you're a GOD 😀

no, you're just overestimating the impact of latency at this degree.

Astyanax:

no, you're just overestimating the impact of latency at this degree.

No you are underestimating the impact of latency. It depends what you are using the storage for. For lurking on forums only, latency isn't that important 😉 Not everyone "need" low latency like Optane, but that doesn't mean that no one can take advantage of it 🙂

you're more likely to notice the latency between your brain and eyes than the latency on this drives.

nizzen:

No you are underestimating the impact of latency. It depends what you are using the storage for. For lurking on forums only, latency isn't that important 😉

Name 1 thing where shaving off a few nanoseconds on storage latency makes a noticeable impact on a real-world workload you personally do. Just 1. I noticed you mentioned you have 3 drives. Are these in RAID? Because that alone will absolutely butcher your latency.

schmidtbag:

Name 1 thing where shaving off a few nanoseconds on storage latency makes a noticeable impact on a real-world workload you personally do. Just 1. I noticed you mentioned you have 3 drives. Are these in RAID? Because that alone will absolutely butcher your latency.

https://www.diskusjon.no/uploads/monthly_12_2017/post-42975-0-19534400-1512572313_thumb.png Yeah, the latency is pretty bad with 3x Optane 900p ;) You must be an expert, that knew that 😛

nizzen:

https://www.diskusjon.no/uploads/monthly_12_2017/post-42975-0-19534400-1512572313_thumb.png Yeah, the latency is pretty bad with 3x Optane 900p ;) You must be an expert, that knew that 😛

Um.... read/write speed has little to no correlation to latency... Also, you didn't answer my question.

schmidtbag:

Um.... read/write speed has little to no correlation to latency... Also, you didn't answer my question.

Look @ 4k random read @ QD=1.... Then replay 😉

nizzen:

Look @ 4k random read @ QD=1.... Then replay 😉

Answer my question then reply. EDIT: BTW, the 900P 4K random read should go much faster than that.

schmidtbag:

Answer my question then reply.

If you don't know what it is, then you don't need it. 😉

schmidtbag:

Answer my question then reply. EDIT: BTW, the 900P 4K random read should go much faster than that.

No

nizzen:

If you don't know what it is, then you don't need it. 😉

Of course I don't know why you need it, that's why I'm asking. I'm well aware my personal needs don't need better latency; I'm asking why you need it. Why can't you just give me a straight answer? All I'm asking for is 1 example, and Crystal is not a real-world example. Considering how many times you work around the question, I'm beginning to think it is actually you who doesn't know what it is, which in turn means you too don't need it.

nizzen:

No

Yes: https://images.tweaktown.com/content/8/4/8423_25_intel-optane-ssd-900p-280gb-480gb-aic-nvme-pcie-review.png A single drive obviously will lose a substantial amount of speed for sequential read/write, but you can see how the randoms are significantly improved over a multi-drive setup. In this context, that is a result of latency. The added latency is caused at the software level, so, there's not much you can do to speed it up other than to just use fewer drives. Even if Micron's new Xpoint has better latency (which again, we're probably talking nanoseconds of difference here; that's not significant enough to care), putting the drives in RAID is going to negate the differences. But again... you haven't specified what it is you care so much about latency, so, does it even matter? Perhaps you benefit more from the faster sequential speeds, which I have a much easier time believing.

schmidtbag:

Of course I don't know why you need it, that's why I'm asking. I'm well aware my personal needs don't need better latency; I'm asking why you need it. Why can't you just give me a straight answer? All I'm asking for is 1 example, and Crystal is not a real-world example. Considering how many times you work around the question, I'm beginning to think it is actually you who doesn't know what it is, which in turn means you too don't need it. Yes: https://images.tweaktown.com/content/8/4/8423_25_intel-optane-ssd-900p-280gb-480gb-aic-nvme-pcie-review.png A single drive obviously will lose a substantial amount of speed for sequential read/write, but you can see how the randoms are significantly improved over a multi-drive setup. In this context, that is a result of latency. The added latency is caused at the software level, so, there's not much you can do to speed it up other than to just use fewer drives. Even if Micron's new Xpoint has better latency (which again, we're probably talking nanoseconds of difference here; that's not significant enough to care), putting the drives in RAID is going to negate the differences. But again... you haven't specified what it is you care so much about latency, so, does it even matter? Perhaps you benefit more from the faster sequential speeds, which I have a much easier time believing.

That picture are showing 314MB/s 4k random read @ QD=1 LOL

nizzen:

That picture are showing 314MB/s 4k random read @ QD=1 LOL

Considering how much you ostensibly "need" better latency, why is the QD1 performance all you care about? Surely, whatever this [non-existent] workload you have that needs all this performance would need to go to 4 or 32. Regardless, none of what I'm saying here is relevant if you're not actually doing any form of striped RAID (not sure if parity has any significant impact on latency). You haven't clarified if your drives are striped or not. None of this changes the fact you're still dodging my question, so, I'm going to assume you really don't need drives with better latency (which is fine; I'm not ridiculing).