Groups > linux.debian.user > #205318

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

From	Michael Stone <mstone@debian.org>
Newsgroups	linux.debian.user
Subject	Re: Swap space choice on a SSD <- Current best practice on?
Date	2019-02-13 22:30 +0100
Message-ID	<xragq-6nn-9@gated-at.bofh.it> (permalink)
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On Wed, Feb 13, 2019 at 01:14:36PM -0800, David Christensen wrote:
>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.

In the absence of trim, restricting the logical capacity of the drive 
ensures a larger pool of cells known to the drive to be unused and 
available for wear leveling. Otherwise, if you write to a cell the drive 
has to always preserve the data in that cell even if you later erase the 
file you wrote there (because the drive doesn't know it was erased).  
This is essentially what the drive manufacturers do: they build a drive 
with capacity N but sell it as N-S where S is the amount of spare 
capacity held in reserve for wear leveling and to allow for cells to be 
removed from service as they reach end of life. In general, the more 
expensive the drive, the more it is overprovisioned to increase the 
longevity of the device.

On modern SSDs in light duty the difference is probably negligeable, 
especially if you occasionally fstrim to communicate how much of the 
drive is actually unused.

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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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