Date: Mon, 4 Jan 2016 21:40:20 -0600 From: Adam Vande More <amvandemore@gmail.com> To: Paul Kraus <paul@kraus-haus.org> Cc: FreeBSD Filesystems <freebsd-fs@freebsd.org>, "Mikhail T." <mi+thun@aldan.algebra.com> Subject: Re: NFS reads vs. writes Message-ID: <CA%2BtpaK06bbFat--1xYDnWnShNziV3z9F5X3kwiY1APQxB55G0Q@mail.gmail.com> In-Reply-To: <D0AC7351-25DC-478C-981E-E32B1F5E353F@kraus-haus.org> References: <8291bb85-bd01-4c8c-80f7-2adcf9947366@email.android.com> <5688D3C1.90301@aldan.algebra.com> <495055121.147587416.1451871433217.JavaMail.zimbra@uoguelph.ca> <568A047B.1010000@aldan.algebra.com> <CAGtEZUD28UZDYyHtHtzXgys%2Brpv_37u4fotwR%2BqZLc1%2BtK0dwA@mail.gmail.com> <D0AC7351-25DC-478C-981E-E32B1F5E353F@kraus-haus.org>
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On Mon, Jan 4, 2016 at 9:06 PM, Paul Kraus <paul@kraus-haus.org> wrote: > I have a file server that I am going through the task of optimizing for > NFS traffic (to store VM images). My first attempt, because I knew about > the need for an SSD based SLOG for the ZIL was using a pair of Intel 535 > series SSD=E2=80=99s. The performance with the SLOG/ZIL on the SSD was _w= orse_. > Turns out that those SSD=E2=80=99s have poor small block (8 KB) random wr= ite > performance (not well advertised). So I asked for advice for choosing a > _fast_ SSD on the OpenZFS list and had a number of people recommend the > Intel DC-Sxxxx series of SSDs. > > Based on the very thorough data sheets, I am going with a pair of DC-S371= 0 > 200 GB SSDs. Once I get them in and configured I=E2=80=99ll post results. > > Note that my zpool consists of 5 top level vdevs each made up of a 3-way > mirror. So I am striping writes across 5 columns. I am using 500 GB WD RE > series drives leaving the ZIL on the primary vdevs was _faster_ than addi= ng > the consumer SSD as SLOG for NFS writes Something like zeusram or ddrdrive is probably going to yield the most preformant solution for zfs sync writes. --=20 Adam
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