From owner-freebsd-fs@FreeBSD.ORG Mon Dec 2 02:32:33 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 ESMTPS id E9D8C139 for ; Mon, 2 Dec 2013 02:32:33 +0000 (UTC) Received: from mail-pb0-x235.google.com (mail-pb0-x235.google.com [IPv6:2607:f8b0:400e:c01::235]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id BFF4A16F3 for ; Mon, 2 Dec 2013 02:32:33 +0000 (UTC) Received: by mail-pb0-f53.google.com with SMTP id ma3so17713709pbc.26 for ; Sun, 01 Dec 2013 18:32:33 -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=XTgloElQKWAhPetguT9bn1fJG6uhj2eMdBrfiu19uqs=; b=HSn933XFw+98E057kEXth1xW48CwXmE77GCN576HKlRskeodgwwuwcSpXO33n+3msw oSVS/VdNEhuCDqgMoIUXA5VPJBTv4Ym+JokZjXeGX6CW/u+HUDB14I+fXlHqWFdKhBMn y2/qCBzNrlq9DRuA47AkuEBneLXHCCvekLn4U2+pEGN5pP0zZK8B1Q7HVASFGhx5F63e 1R/dQVQmxd5C+SeLFF5Dccv32+KoHKNpWcEOEwJDyoaEn7HDgq0edkcDYVFD8P6m86mO 5KTgTMhx9RIDKYvWxAdsB0X7k+xXX/0zIFoAiuG3WZjRFe8aPLyTsRXrwoNCIpLojQxU 7MsQ== MIME-Version: 1.0 X-Received: by 10.68.245.227 with SMTP id xr3mr305526pbc.182.1385951553464; Sun, 01 Dec 2013 18:32:33 -0800 (PST) Received: by 10.70.92.79 with HTTP; Sun, 1 Dec 2013 18:32:33 -0800 (PST) In-Reply-To: <1381005634317-5849247.post@n5.nabble.com> References: <1380880223590-5848720.post@n5.nabble.com> <524EEE40.5060208@gmail.com> <1381005634317-5849247.post@n5.nabble.com> Date: Sun, 1 Dec 2013 20:32:33 -0600 Message-ID: Subject: Re: Questions re swap-on-zfs From: Adam Vande More To: Beeblebrox Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.16 Cc: freebsd-fs X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.16 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 02 Dec 2013 02:32:34 -0000 On Sat, Oct 5, 2013 at 3:40 PM, Beeblebrox wrote: > > > want to minimise usage of swap-on-SSD > so as to prevent SSD fatigue for the swap area. > This is an invalid concern or at least an inadequately worded one. All modern SSD's use static wear leveling. This plus leaving approximately 10% of the drive unpartitioned/unused will ensure you'll get as close to the theoricial limit that one can reasonable achieve. Swap-on-ZFS is bad for all the reasons swap-on-UFS is and more. -- Adam