3 ms·

It actually swaps much more than the older machine that I have, at 3% wear already. And the indicator isn't linear. (at 30TB written currently, 250TB and the ma

by my123 6y ago

It actually swaps much more than the older machine that I have, at 3% wear already. And the indicator isn't linear. (at 30TB written currently, 250TB and the machine risks failure when estimating from a machine which actually failed from this already) In those machines, Apple just uses TLC flash from Toshiba/Kioxia (off-the-shelf). There's already some pathological cases where the drive actually died from this: https://twitter.com/lunixbochs/status/1366209143824998405?s=21 https://twitter.com/lunixbochs/status/1366209143824998405?s=... For some reason, it goes crazy after about a week and a half of uptime in desktop use, after which it starts thrashing the SSD at a crazy rate. The 256GB model of the 980 Pro, a top-of-the-line TLC SSD is rated at just 150TBW.

deleted 6y ago
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ece 6y ago
True story: I bought a 256GB 960EVO ~4 years ago strictly for the performance, I've written 50TB, and it shows 100%. I think temperature might have something to do with the percentage. I replaced it with a 1TB Hynix P31 for the same price (~$100) recently. 1TB MLC/TLC drives were ~$400+ when I bought the 960EVO, so I'm not mad. If I couldn't replace it, I just might be. The TLC has improved this much between the two drives: 1200MB/s vs 1700MB/s sustained write, 1.5x random read IOPS, almost 2x TBW rating compared to 1TB 960EVO. The 960EVO hasn't started to slow down yet or use it's reserved space, so I imagine I can keep using it as an external drive until it does. edit: What I've said is indicative of an TLC/PCIE 3 NVMe upgrade path, what will a PCIE 4 NVMe (980PRO) upgrade look like in 4 years?
supermatt 6y ago
Like others, you are comparing to some dated, off the shelf, consumer SSD (980 pro). It is CLEARLY not regular consumer TLC given the figures reported. It will be using some pSLC type arrangement (iTLC?), otherwise percentage used would be considerably higher given TBW. From the horses mouth: https://blog-us.kioxia.com/post/2020/09/18/solving-a-designer-s-dilemma-which-slc-nand-is-right-for-you https://blog-us.kioxia.com/post/2020/09/18/solving-a-designe... More information: https://www.electronicdesign.com/industrial-automation/article/21140513/kioxa-pseudoslc-nand-improves-criticalapp-reliabilitywhile-cutting-costs#:~:text=Reducing%20the%20number%20of%20stored,effective%20alternative%20to%20SLC%20NAND https://www.electronicdesign.com/industrial-automation/artic....

by my123 6y ago

deleted 6y ago

[deleted]

ece 6y ago

True story: I bought a 256GB 960EVO ~4 years ago strictly for the performance, I've written 50TB, and it shows 100%. I think temperature might have something to do with the percentage. I replaced it with a 1TB Hynix P31 for the same price (~$100) recently. 1TB MLC/TLC drives were ~$400+ when I bought the 960EVO, so I'm not mad. If I couldn't replace it, I just might be. The TLC has improved this much between the two drives: 1200MB/s vs 1700MB/s sustained write, 1.5x random read IOPS, almost 2x TBW rating compared to 1TB 960EVO. The 960EVO hasn't started to slow down yet or use it's reserved space, so I imagine I can keep using it as an external drive until it does. edit: What I've said is indicative of an TLC/PCIE 3 NVMe upgrade path, what will a PCIE 4 NVMe (980PRO) upgrade look like in 4 years?

supermatt 6y ago

Like others, you are comparing to some dated, off the shelf, consumer SSD (980 pro). It is CLEARLY not regular consumer TLC given the figures reported. It will be using some pSLC type arrangement (iTLC?), otherwise percentage used would be considerably higher given TBW. From the horses mouth: https://blog-us.kioxia.com/post/2020/09/18/solving-a-designer-s-dilemma-which-slc-nand-is-right-for-you https://blog-us.kioxia.com/post/2020/09/18/solving-a-designe... More information: https://www.electronicdesign.com/industrial-automation/article/21140513/kioxa-pseudoslc-nand-improves-criticalapp-reliabilitywhile-cutting-costs#:~:text=Reducing%20the%20number%20of%20stored,effective%20alternative%20to%20SLC%20NAND https://www.electronicdesign.com/industrial-automation/artic....