Date: Sun, 2 Dec 2018 00:43:31 -0700 From: Warner Losh <imp@bsdimp.com> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: RW <rwmaillists@googlemail.com>, "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> Subject: Re: How to use trim command ?,Re: How to use trim command ? Message-ID: <CANCZdfoz9HD7L-hjYeM%2BhQymhHGJGPQ40T7g-m6g9Ns0XFjr5A@mail.gmail.com> In-Reply-To: <60912.1543734235@critter.freebsd.dk> References: <7e69211c-6ffb-6155-b17a-a845c0b3586d@grosbein.net> <20181201.093153.893601099798031027.ish@amail.plala.or.jp> <1c7139bd-258c-e7d2-2572-052da3803b3b@freebsd.org> <20181201.202332.546134930481017424.ish@amail.plala.or.jp> <CANCZdfqsVo_mk4TqJy8pmp%2BDQvDSg-cgwxM03%2BxgT5_Y%2BVKvnA@mail.gmail.com> <12404.1543699424@critter.freebsd.dk> <20181201222424.0ae8abfd@gumby.homeunix.com> <1177.1543704042@critter.freebsd.dk> <CANCZdfrb0gWAhSUAVvs0pBjezWgh3c_kHjriknC02KZF%2BMVE9A@mail.gmail.com> <60912.1543734235@critter.freebsd.dk>
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On Sun, Dec 2, 2018 at 12:03 AM Poul-Henning Kamp <phk@phk.freebsd.dk> wrote: > -------- > In message < > CANCZdfrb0gWAhSUAVvs0pBjezWgh3c_kHjriknC02KZF+MVE9A@mail.gmail.com>, > Warner Losh writes: > > >Erase has become super expensive with QLC nand. And many SSDs are trying > to > >use simpler, smaller data structures to implement its LUTs. > > They may not have a choice, there are patent-issues in this space. > > Still, I would avoid any SSD which has issues in this space for normal > filesystem operations. > Good advice, if you can afford the more expensive NAND... Cost reduction efforts have lead me to try to make such NAND suck less. Warner
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