From owner-freebsd-fs@freebsd.org Tue Jan 5 03:42:27 2016 Return-Path: Delivered-To: freebsd-fs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id E8A6EA61851 for ; Tue, 5 Jan 2016 03:42:26 +0000 (UTC) (envelope-from paul@kraus-haus.org) Received: from mail-qg0-x233.google.com (mail-qg0-x233.google.com [IPv6:2607:f8b0:400d:c04::233]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id A013D10A9 for ; Tue, 5 Jan 2016 03:42:26 +0000 (UTC) (envelope-from paul@kraus-haus.org) Received: by mail-qg0-x233.google.com with SMTP id 6so191813710qgy.1 for ; Mon, 04 Jan 2016 19:42:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kraus-haus-org.20150623.gappssmtp.com; s=20150623; h=subject:mime-version:content-type:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=pVLHt0Bbuy6gH9A8uj+KQuITcGRIUmwMjZ6WnlkxYOc=; b=tmtYnHet5o1f2m/KZBoqEC8xqPgORw6SK+3s9Xmnn478MEXPNJvwYKNP25FjLhv5zs ne/Z6V/5uu+MG5Su/UIcO415YlYPk7B/+/dKsdVYgsKuXMa6dn1/Cc/yDwJysl8CshWi lRfECk0MWTAqWeoq5QWjKt4/5ZvZiigThfPjVr/sCVHrcTlfoS03nW1TPJiRYH33laDW mYicIdmQHGbO0tCngfvIKYmmHegUyYz7jXnZN5dL85DE4rLNL631WQzwU4EEKg2ff8YK eUxZW9E/B3IZVDaXqQKJSVJvQpLnjWsOc5LIyTivovMXH7C1VIWea06C+xBlQuhLx7km J7Nw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:subject:mime-version:content-type:from :in-reply-to:date:cc:content-transfer-encoding:message-id:references :to; bh=pVLHt0Bbuy6gH9A8uj+KQuITcGRIUmwMjZ6WnlkxYOc=; b=GIymIw03NxW292ib+58yz7oNBxiROP4jNp3uD1L5mL3wbNgSD28BCRBUqappGzoKI5 SIixhefPjnDJjtFSNJU6Garl3GpSy4zybAwsFEiFWLM4ApaSeL0vbXTYHH/b0T2iigGb jzRqXd7wvJuOh0HrGw3bzYuzct6ygYsudZ640NUjCUppm3J3+snoeM7bNE0xBokREiWY YwC9YlKfwlwMY1nBvAIS8wTrlZRHo8guYf3N9sQNrpP2AsQGqCJxTDwT82qKhR5fgN/h tWVkEvthqdZiaBWOqAktwOdEoQFuWRaAe931I6xB3y8OKrZZkidLRZkAi4UgYpIPjrGQ XrAQ== X-Gm-Message-State: ALoCoQmo3Zaf8FU9awb5/2F/uL4W4a/srUo9ovxYKRW1rSuOb8/2lCuD2KBylYQPwStTlQK1wOISIX8EzUCT9Y6RNcqfNXObWg== X-Received: by 10.141.5.136 with SMTP id h130mr125358014qhd.47.1451965345725; Mon, 04 Jan 2016 19:42:25 -0800 (PST) Received: from [192.168.2.138] (pool-100-4-199-226.albyny.fios.verizon.net. [100.4.199.226]) by smtp.gmail.com with ESMTPSA id m127sm31648480qhm.43.2016.01.04.19.42.24 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 04 Jan 2016 19:42:24 -0800 (PST) Subject: Re: NFS reads vs. writes Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.6\)) Content-Type: text/plain; charset=windows-1252 From: Paul Kraus In-Reply-To: Date: Mon, 4 Jan 2016 22:42:21 -0500 Cc: FreeBSD Filesystems , "Mikhail T." Content-Transfer-Encoding: quoted-printable Message-Id: <38A28FE6-5EE9-48B0-BC7C-6C02EB2C0700@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> To: Adam Vande More X-Mailer: Apple Mail (2.1878.6) X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 05 Jan 2016 03:42:27 -0000 On Jan 4, 2016, at 22:40, Adam Vande More wrote: > On Mon, Jan 4, 2016 at 9:06 PM, Paul Kraus = wrote: >=20 >> 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=92s. The performance with the SLOG/ZIL on the SSD was = _worse_. >> Turns out that those SSD=92s have poor small block (8 KB) random = write >> 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. > Something like zeusram or ddrdrive is probably going to yield the most > preformant solution for zfs sync writes. Agreed, but I don=92t have the budget for that :-( -- Paul Kraus paul@kraus-haus.org