From owner-freebsd-stable@freebsd.org Wed Feb 10 10:15:19 2016 Return-Path: Delivered-To: freebsd-stable@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 89264AA3E9B for ; Wed, 10 Feb 2016 10:15:19 +0000 (UTC) (envelope-from kraduk@gmail.com) Received: from mail-wm0-x232.google.com (mail-wm0-x232.google.com [IPv6:2a00:1450:400c:c09::232]) (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 20ECD1367 for ; Wed, 10 Feb 2016 10:15:19 +0000 (UTC) (envelope-from kraduk@gmail.com) Received: by mail-wm0-x232.google.com with SMTP id g62so19745843wme.0 for ; Wed, 10 Feb 2016 02:15:19 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=Sj42b1fluPg9zeOLMZLR4FHLnE3BSbrrKYtl1CNF++0=; b=lFfu7wNIp7kRKrM+NAQCdT4tro8DHSAe30ApYy2xl1Qk/KPm5VsEMEHD3Io4315rZ/ ztskvkD8qyWMN7pZnjNPK/oXhve2XlwXXBsYjVDUNbF2JyNYbgfQkr/0inJ2YVxIBG2e hgXeHgV2xEpWZ/cQneW8fAz90PzvTIpUnoa74k2Kxkt6+Zgy4iXTV8tU2eN72FV7Q/rm NUQ4LeJRfBc0rrCV8dCd1/41Py5IfJ+CrUSHVwePOLJDCbqjPcdOeYwhk1iqxuVw3wG/ hwVZD+amHZa1lkARsYDixkJt9hyX+hisCUPO9dfToqheFRPUmsfT5b1LBMYU36f2ym25 5gXA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=Sj42b1fluPg9zeOLMZLR4FHLnE3BSbrrKYtl1CNF++0=; b=bwopscGli7xuG+Xi4GiXmFOYa4jz+4/1cNymXAhpzdLPAsojSYcjaB8vDmAoxyFq3N 4kRHr2xyhWHdRXwQRhhZpOWzLKXwugGIkk9p1mtmBuXY5/a3ynUtvC6lv5l9mBEIwNc2 ZvWQ9H8zO31J+B5ioHdWPWE4tl8Z2D/qapCX3+KistA1ZBvnoUKRLRcDT5qM40rtzZlN dtVle3lXFjScka83rEZZu+Cl+G216LVxR/hvJnePDITqT91iT6Ng+VID93O9TIgsCEkG dWHE1N9yF/Dm3qWvn510SDcOreP4OXx0NPiIqUDYFdQ18BQ2Z1a9wLPDk08kwMW4EH2B ClvA== X-Gm-Message-State: AG10YOQ7wS1VHnKS8JqnQoldQfjmkiGCzDj03vwNHSUvzcHnS5gg0LH8Q3y7B7GLiBlAgYL9vT/V948R2V5DWg== MIME-Version: 1.0 X-Received: by 10.194.103.164 with SMTP id fx4mr39210889wjb.56.1455099317582; Wed, 10 Feb 2016 02:15:17 -0800 (PST) Received: by 10.28.31.77 with HTTP; Wed, 10 Feb 2016 02:15:17 -0800 (PST) In-Reply-To: <2D296837-3B06-4E72-B8B0-A33AE6CE48AE@punkt.de> References: <2D296837-3B06-4E72-B8B0-A33AE6CE48AE@punkt.de> Date: Wed, 10 Feb 2016 10:15:17 +0000 Message-ID: Subject: Re: Best practices for ZFS setup for a strictly SSD based system? From: krad To: "Patrick M. Hausen" Cc: freebsd-stable Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.20 X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Feb 2016 10:15:19 -0000 Dont forget alignment and ashift. You may also want to test compression as well. IF you have spare cpu cycles I would imagine the systems cpu will handle it faster than any onboard ssd compression. Benchmarking would be of use here though. On 9 February 2016 at 15:54, Patrick M. Hausen wrote: > Hi, all, > > while there is quite a bit of documentation on how to improve ZFS > performance > by using a combination of rotating disks and SSDs, I have not found much > about > an SSD only setup. > > We are planning to try a hosting server with 8 SATA SSDs with ZFS. Things > I am > not at all sure about: > > * Does the recommended limit of 6 disks for a RAIDZ2 still > hold? 2x 4 disks is quite a bit of overhead, could I use all 8 > in one vdev and get away with it? > (The maximum of 6 recommendation is in some old Sun doc) > > * Will e.g. MySQL still profit from residing on a mirror > instead of a RAIDZ2, even if all disks are SSDs? > > * Does a separate ZIL and/or ARC cache device still > make sense? > > Any pointers or direct help greatly appreciated. Or should I take this to > freebsd-fs@? > > Thanks and best regards, > Patrick > -- > punkt.de GmbH * Kaiserallee 13a * 76133 Karlsruhe > Tel. 0721 9109 0 * Fax 0721 9109 100 > info@punkt.de http://www.punkt.de > Gf: J=C3=BCrgen Egeling AG Mannheim 108285 > > _______________________________________________ > freebsd-stable@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org"