Comment by throwaway2037

5 hours ago

I checked the specs here: https://www.micron.com/content/dam/micron/global/public/prod...

The interface looks equiv to 4x PCIe 5.0.

    > Sequential read (MB/s): 13,700
    > Sequential write (MB/s): 2,700

That is pretty awful write performance. Does anyone know more about this? I assume all of these hyperdense SSDs suffer from the same drawback. Also, I heard that the E3.L interface can support up to 16x lanes, but there are no practical commerical products at this point.

7 comments

throwaway2037

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sheepscreek  2 hours ago

A more convenient (and dare I say, faster) tape drive replacement for backups? They do make a good point, it would take 10*24TB drives working in the worst raid configuration to even come close to these speeds.

justsomehnguy  3 hours ago

Extremely dense QLC chips. Still it's 2700-3000MByte, ie ~3GByte/second.

What should worry way more is DWPD which is abysmal... on the first glance. But if you punch it in the calc it still would take ages to wear it out.

                    SSD #1    SSD #2     SSD #3
    Capacity (GB)   245000    245000     245000
    Warranty (yr.)  3         3          3
    DWPD            0.3       1          0.075
    TBW (TB)        80482     268275     20121
    TBW (PB)        80.483    268.275    20.121
    PBW             80.483    268.275    20.121
    GB/day          73500     245000     18375
                
    Time period Average host-side write data rate (MB/s) needed for reaching DWPD value within specified time period
    8 hr.           2552.08   8506.94    638.02
    12 hr.          1701.39   5671.30    425.35
    24 hr.           850.69   2835.65    212.67

https://wintelguy.com/dwpd-tbw-gbday-calc.pl

  • _zoltan_  24 minutes ago

    DWPD was the boogey man 10 years ago. everybody worried about it.

    now, nobody cares. I have over 500 NVMe drives in our deployment and the drive deaths are not due to wear.