Re: nvme SSD and poor performance
Anssi Saari <as@sci.fi> wrote:
> Jochen Spieker <ml@well-adjusted.de> writes:
>> Stay away from the "discard" option and do not worry about SSD life.
> What's the issue with the discard option? AFAIK, there may have been
> issues with it in the decade before last but again AFAIK, today some
> distros enable discard and some run fstrim on timer, both work.
> But please share.
This may be part cargo culting and part real problem.
In the past it was shown that many SSD needed to flush their whole queue
whenever a TRIM command was received and the Kernel was really zealos of
sending those for every block freed.
This basically neutered many SSD and even caused corruption issues on
some especially shoddy ones.
Some firmwares got fixed and newer drives don't suffer from the same
problems, but even now end then you can find some devices on the lower
end of the consumer spectrum behaving poorly when bombarded with TRIM
commands.
So in the end the consensous was to just play it safe and batch-TRIM
once a week or day, because TRIMming on demand hasn't been shown to be a
big win.
It is far easier to fall back on that option than trying to
good/bad-list specific drive or firmware versions and select the
appropriate TRIM method.
Grüße,
Sven.
--
Sigmentation fault. Core dumped.
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