Date: Fri, 22 Jul 2016 14:02:37 -0500 From: "Eric A. Borisch" <eborisch@gmail.com> To: Karl Denninger <karl@denninger.net> Cc: "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org> Subject: Re: ZFS, SSD and encryption Message-ID: <CAASnNnpnST%2BD6fVT%2BFrH%2BomkwNQb4rG1NJk0T=O2AetzrXEThA@mail.gmail.com> In-Reply-To: <b8b000ff-289c-7348-8b63-00f3ac51accf@denninger.net> References: <CAJPDrRtLBNKr4BynSGMRfFGdAR0ZbDuwfcqkLupvk5HtgqrbQg@mail.gmail.com> <b8b000ff-289c-7348-8b63-00f3ac51accf@denninger.net>
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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
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