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From: Nikos Kastanas <zerotronic@gmail.com>
Date: Fri, 22 Jul 2016 22:14:49 +0300
Message-ID: <CAJPDrRvCW+PguYe0tAhXTEXMZ7_YgGxPy0Uwr6PwtBVoSZKk_g@mail.gmail.com>
Subject: Re: Re: ZFS, SSD and encryption
To: freebsd-fs@freebsd.org, Karl Denninger <karl@denninger.net>, 
 "Eric A. Borisch" <eborisch@gmail.com>
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>On Friday, July 22, 2016, Karl Denninger <karl@denninger.net> wrote:
>
>>
>> On 7/22/2016 07:48, Nikos Kastanas wrote:
>>> I have a Lenovo X220 laptop running FreeBSD 10.3-RELEASE with ZFS
>>> and encryption on a plain HDD. I am considering buying a Samsung Pro
>>> 850 SSD
>> to
>>> boost performance but I am not sure if TRIM and ZFS+Encryption work
>>> well together. After some research online, I found *this page*
>>> <https://www.freebsd.org/doc/faq/all-about-zfs.html>which states the
>>> following:
>>>
>>> *Note: *
>>> ZFS TRIM may not work with all configurations, such as a ZFS
>>> filesystem
>> on
>>> a GELI-backed device.
>>>
>>> From what I can understand from the above note, I should not use the
>>> encryption option when installing FreeBSD with ZFS on an SSD. TRIM
>>> will
>> not
>> > work correctly and therefore the SSD performace will be impacted.
>> Meh.  Simply not true.
>>
>
>It will not work on 10.3, but will work (as Karl demonstrates) on 11.x.
>Here's the commit to head enabling it:
>
>https://svnweb.freebsd.org/base?view=revision&revision=286444
>
>And here's what is in 10.3 (BIO_DELETE case returns EOPNOTSUPP):
>
>
https://svnweb.freebsd.org/base/releng/10.3/sys/geom/eli/g_eli.c?revision=296373&view=markup#l319
>
> -  Eric

Thank you for your answer and the clarification.