From owner-freebsd-fs@FreeBSD.ORG Thu Aug 29 22:03:52 2013 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTP id EBD248AE for ; Thu, 29 Aug 2013 22:03:52 +0000 (UTC) (envelope-from ericbrowning@skaggscatholiccenter.org) Received: from mail-pa0-f52.google.com (mail-pa0-f52.google.com [209.85.220.52]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id C12542DC3 for ; Thu, 29 Aug 2013 22:03:52 +0000 (UTC) Received: by mail-pa0-f52.google.com with SMTP id kq13so1473494pab.25 for ; Thu, 29 Aug 2013 15:03:46 -0700 (PDT) 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=/fYacKA+TVOK3XsaefkbQxy8BcLu5B4tvpeCeYNgkmY=; b=Djq2OvVUiSYSVd3tLkc3TE6MX9rIORj/2XHh7w9oRtsrL05Rf0SrFjmc9VfiX2udXt /FOgr77whzNqmZC36PC97Qso/de+85fwlwQXsa/nn0oHPQyxshs372o9A4/x1qS0JeSo wLwUk/H52/HtqLIyzVTDLUhtGfM/kcGWvT/8dvH19k9CeOO4qOLa02W0e078FSJQygQ/ 5t4ZvHO97vWmutn3eaCUCvDccCOECuHFkJb+ho+PewZpKmOCClFTBCJqb8z9xiIaqH4z uIzXugaxCIsg22B2IIQ52f35/FTvCIa256XSLRysKApe4eX4gwUfveXj6Z2tFuIgqFQX qSUA== X-Gm-Message-State: ALoCoQkBWWl90uazZnVjTLabdGP9nmhJHd5TacVQtbRTr+250ZL6BNlEkhlr5t2HibVwOQTpxNaR MIME-Version: 1.0 X-Received: by 10.68.236.168 with SMTP id uv8mr6076135pbc.124.1377813826143; Thu, 29 Aug 2013 15:03:46 -0700 (PDT) Received: by 10.70.26.4 with HTTP; Thu, 29 Aug 2013 15:03:46 -0700 (PDT) In-Reply-To: References: <1079189088.15197172.1377784177805.JavaMail.root@uoguelph.ca> <877gf4cj7o.wl%berend@pobox.com> Date: Thu, 29 Aug 2013 16:03:46 -0600 Message-ID: Subject: Re: NFS on ZFS pure SSD pool From: Eric Browning To: Freddie Cash Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.14 Cc: FreeBSD FS X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Aug 2013 22:03:53 -0000 Oops forgot to include the limit value sysctl vfs.zfs.arc_meta_limit vfs.zfs.arc_meta_limit: 14217216000 so using about 7 gig, limit is 14 gig. On Thu, Aug 29, 2013 at 3:58 PM, Freddie Cash wrote: > On Thu, Aug 29, 2013 at 2:55 PM, Eric Browning < > ericbrowning@skaggscatholiccenter.org> wrote: > >> sysctl vfs.zfs.arc_meta_used yeilds: >> >> vfs.zfs.arc_meta_used: 6916698888 >> >> There is 56GB of RAM dedicated to ARC >> > > So that's using the full 12.5% (one eighth) of the ARC. Depending on how > efficient your ARC is (high data hit rates, low data hit rates, low actual > memory usage, etc), you may want to test increasing this to see if it helps > with the NFS cache hit rates stuff. > > -- Eric Browning Systems Administrator 801-984-7623 Skaggs Catholic Center Juan Diego Catholic High School Saint John the Baptist Middle Saint John the Baptist Elementary