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Re: Swap space choice on a SSD <- Current best practice on?

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David Christensen wrote: 
> On 2/13/19 6:11 AM, Dan Ritter wrote:
> > If you want maximum SSD longevity, increase the amount of space that
> > the SSD can use for remapping by never writing to some amount of
> > space. Easiest is to not fill the disk with partitions -- leave 5-10%
> > empty.
> 
> AFAIK over-provisioning has no effect on longevity -- longevity is
> proportional to total number of cells times rated erase/ write cycles
> per cell divided by write throughput.
> 
> 
> But, over-provisioning can improve write performance:
> 
> https://en.wikipedia.org/wiki/Write_amplification#Over-provisioning

Effective longevity depends on the number of times a block is
erased and written to. You can reduce that over the course of an
SSD's lifetime by limiting the space you think you have
available.

>From the article you cited:

"Over-provisioning often takes away from user capacity, either
temporarily or permanently, but it gives back reduced write
amplification, increased endurance, and increased performance."

Increased endurance is increased longevity.

-dsr-

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        Swap space choice on a SSD <- Current best practice on? deb <deb@rangingthoughts.org> - 2019-02-13 14:50 +0100
          Re: Swap space choice on a SSD <- Current best practice on? Michael Stone <mstone@debian.org> - 2019-02-13 14:50 +0100
            Re: Swap space choice on a SSD <- Current best practice on? deb <deb@rangingthoughts.org> - 2019-02-13 15:00 +0100
              Re: Swap space choice on a SSD <- Current best practice on? Dan Ritter <dsr@randomstring.org> - 2019-02-13 15:20 +0100
                Thanks Dan. Re: Swap space choice on a SSD <- Current best practice  on? deb <deb@rangingthoughts.org> - 2019-02-13 15:40 +0100
          Re: Swap space choice on a SSD <- Current best practice on? David Christensen <dpchrist@holgerdanske.com> - 2019-02-13 22:20 +0100
            Re: Swap space choice on a SSD <- Current best practice on? Dan Ritter <dsr@randomstring.org> - 2019-02-13 22:30 +0100
              Re: Swap space choice on a SSD <- Current best practice on? Andy Smith <andy@strugglers.net> - 2019-02-13 22:50 +0100
              Re: Swap space choice on a SSD <- Current best practice on? David Christensen <dpchrist@holgerdanske.com> - 2019-02-14 05:20 +0100
            Re: Swap space choice on a SSD <- Current best practice on? Andy Smith <andy@strugglers.net> - 2019-02-13 22:30 +0100
              Re: Swap space choice on a SSD <- Current best practice on? David Christensen <dpchrist@holgerdanske.com> - 2019-02-14 05:30 +0100
            Re: Swap space choice on a SSD <- Current best practice on? Michael Stone <mstone@debian.org> - 2019-02-13 22:30 +0100

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