[Bglug] [kwlug-disc] Installing onto an SSD

[Anthony Morassutti]

What is a "trim" command??

On 11/03/2021, LP <LPCC at pm.me> wrote:
> Thank you explains a lot
>
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> Sent from ProtonMail mobile
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>
>
> \-------- Original Message --------
> On Mar. 11, 2021, 9:15 a.m., Remi Gauvin < remi at georgianit.com> wrote:
>
>>
>>
>>
>> On 2021-03-10 9:23 p.m., Remi Gauvin wrote:
>>
>> >>
>> >
>> > Short version: The install should handle it for you.
>> >
>> > Somewhat longer version:
>>
>>
>> TL:DR: If you have a Samsung SSD and are having trouble with fstrim, or
>> just want to be safe and avoid a 'feature' that has a long history of
>> disastrous problems, add, libata.force=noncqtrim to your kernel options.
>>
>> For grubs, edit the /etc/default/grub file, find the
>> GRUB\_CMDLINE\_LINUX\_DEFAULT= and inert the parameter inside the quotes.
>> Save and run update-grub
>>
>> The Story:
>>
>> Soo.... this question prompted me to examine my system and find that my
>> install of Manjero linux did not, in fact, include a scheduled fstrim
>> (or much of anything, really.). I have been operating my new computer
>> for several months without the benefit of trim.
>>
>> As soon as tried running the command, however, I would freeze my
>> computer for for several (over 10) minutes. After much trial and error,
>> I concluded that this was the result of Queued Trim.
>>
>> History (paraphrased from memory, mistakes are expected:)
>>
>> Queued Trim is a feature that Some SSD's claim to support that allows
>> trim commands to be queued with the other write commands on SSD.
>> Withouy Queued Trim, any trim command will block the drive until the
>> command completes, potentially having very grave performance effects if
>> lots of small chunks of data are being deleted and trimmed. This is one
>> of the main reasons why almost all Linux distros used a scheduled batch
>> fstrim command instead of mounting ssd's with the 'discard' option.
>>
>> Linux was very quick to implement Queued Trim, but it's important to
>> note here: Neither Windows nor Macs use this feature, so linux users
>> were the first to find several implementation bugs with different models
>> of SSD's. The kernel quickly implemented a Blacklist that includes most
>> (at some point, I think all) Samsung SSD's.
>>
>> Unknown to me, at some point around 2018, Samsung reached out and
>> claimed Queued Trim was safe to use with their 860 EVO/Pro drives, so
>> those were excluded from the blacklist.
>> Even though people have been reporting problems with it ever since, the
>> problem reports remain too inconsistent, (depends on chipsets of the
>> Sata controller, firmware versions, etc maybe.) Even though Queued Trim
>> has no performance benefit for distros using the batch trim jobs (all of
>> them,) and has a history of exposing filesystem destroying bugs, the
>> kernel maintainer refuses to re-add these Samsung SSD's to the
>> blacklist. Personally, this is a feature I would rather disable across
>> the board.
>>
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