From owner-freebsd-questions@freebsd.org Mon Nov 6 19:35:28 2017 Return-Path: Delivered-To: freebsd-questions@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 E9F04E660BC for ; Mon, 6 Nov 2017 19:35:28 +0000 (UTC) (envelope-from kraduk@gmail.com) Received: from mail-qt0-x235.google.com (mail-qt0-x235.google.com [IPv6:2607:f8b0:400d:c0d::235]) (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 A369D806EB for ; Mon, 6 Nov 2017 19:35:28 +0000 (UTC) (envelope-from kraduk@gmail.com) Received: by mail-qt0-x235.google.com with SMTP id j58so12439366qtj.0 for ; Mon, 06 Nov 2017 11:35:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=oRdo8L4JIJIJ/TUu4GAQwIFdY0Ev453ZDyn8ewA5G8w=; b=i/9SI5RBJUusZxVkrgihBhPqwK5wChQ/IVB9O1MNS7CD8Dn0BKjNBHNIXPU3oV9DrS m9fQ9AjdSIVxvkP2ASnwuT6Czxu/9Hcsxu1Ey1R1NFc5+mSW7eCg/mLmgjCKnvdXLIwX 26NIccg6rkaEJ5LvyWUYm86Iiu7WXcR3+K8Mzu2GYcibjyDBP/Z3M5LNHUVhhRW6Gfgq r8kvw7e+Bb4ExRYeZ1sj9WtLfYQBv8ax6Tc8BCCuOsDldn834ShIB8cTHIExDbROP6fH iF3PBXnG8qazjvzVSUYKt47bPhE8bTVC+BHDqAeG4ERtso4rAbn32Hymp6bMk5cRD113 H/Rg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=oRdo8L4JIJIJ/TUu4GAQwIFdY0Ev453ZDyn8ewA5G8w=; b=HD7TZOGJ0mVWlEtd75nXCLqf4uZBc98+5D03YOZjt0K9vF7AXA2jQtVTpiM09/k5rt EUihgmzDnfjgz7RQCe4NJC5OpLe5kPfHOkjG+JqhcocdcjLGHoSreQT/V2klof+chICf vMtx4+jYslXFrr/TH0EKFPRjftwvR1SR44DYHGAEFUdVkxLhwfPfRQ1l82YNZ64bWZLW WJSvRLOdF7+L2M6B/+DoQlK0IbaWeN5B20yOvrdOoWwo/XNLlTCqpM9HINZbyWwErjQ0 fmS56glfSGYK5fcfIbKDOtXCWg6YuN5+jt+MIgti+FsRJ4Hyhlp5vc2ig+gDQbKMzFnK 4eFQ== X-Gm-Message-State: AMCzsaXhB6HoELCaVkouxDBenQKsTI0gURCcQzNHM/AnpfFF0QvRSyCI 814eZSIrebgKbkz8jmhHlgAD3H68eXS+wixiDs4= X-Google-Smtp-Source: ABhQp+SeUrAt2/MdDNq3TOwUNetZt8r/9ybxZxbdes/JRAszeXNei3yhFio8zmphhnBHHXdhX1Pc2GTTDap4cqPP2v4= X-Received: by 10.237.60.3 with SMTP id t3mr23359656qte.138.1509996927749; Mon, 06 Nov 2017 11:35:27 -0800 (PST) MIME-Version: 1.0 Received: by 10.140.20.65 with HTTP; Mon, 6 Nov 2017 11:35:27 -0800 (PST) In-Reply-To: References: <20171011130512.GE24374@apple.rat.burntout.org> From: krad Date: Mon, 6 Nov 2017 19:35:27 +0000 Message-ID: Subject: Re: FreeBSD ZFS file server with SSD HDD To: Warren Block Cc: Kate Dawson , FreeBSD Questions Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.23 X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 06 Nov 2017 19:35:29 -0000 you might also find the throughput on that many drives in that configuration is higher than the single ssd On 1 November 2017 at 15:23, Warren Block wrote: > On Wed, 11 Oct 2017, Kate Dawson wrote: > > Hi, >> >> Currently running a FreeBSD NFS server with a zpool comprising >> >> 12 x 1TB hard disk drives are arranged as pairs of mirrors in a strip set >> ( RAID 10 ) >> >> An additional 2x 960GB SSD added. These two SSD are partitioned with a >> small partition begin used for a ZIL log, and larger partion arranged for >> L2ARC cache. >> > > For FreeNAS, we recommend against using sharing an SSD like this. In > fact, we recommend against using one SSD for anything more than a single > SLOG for a single pool. To be effective, this needs to be a low-latency > SSD, and I/O contention with other shared partitions on the same device can > negate the performance benefit. > _______________________________________________ > freebsd-questions@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe > @freebsd.org" >