From owner-freebsd-questions@freebsd.org Tue Jan 2 20:17:00 2018 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 6FF3FEB71AA for ; Tue, 2 Jan 2018 20:17:00 +0000 (UTC) (envelope-from kent.kuriyama@gmail.com) Received: from mailman.ysv.freebsd.org (unknown [127.0.1.3]) by mx1.freebsd.org (Postfix) with ESMTP id 48F9470FD8 for ; Tue, 2 Jan 2018 20:17:00 +0000 (UTC) (envelope-from kent.kuriyama@gmail.com) Received: by mailman.ysv.freebsd.org (Postfix) id 457BBEB71A9; Tue, 2 Jan 2018 20:17:00 +0000 (UTC) Delivered-To: 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 451A7EB71A8 for ; Tue, 2 Jan 2018 20:17:00 +0000 (UTC) (envelope-from kent.kuriyama@gmail.com) Received: from mail-wm0-x229.google.com (mail-wm0-x229.google.com [IPv6:2a00:1450:400c:c09::229]) (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 DE97170FD5 for ; Tue, 2 Jan 2018 20:16:59 +0000 (UTC) (envelope-from kent.kuriyama@gmail.com) Received: by mail-wm0-x229.google.com with SMTP id i11so62609650wmf.4 for ; Tue, 02 Jan 2018 12:16:59 -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=/SU5kSWakS45XtlTa0Xsm0cvs6MvgQuq1ctjJQDNZX4=; b=hhkJTLRye/s+wiszsFdWsfCpc8i+b8UZXpNrFk3t1+5kHKGnEGrRN8U96BEnpg12XY GM9nM0cILcR/SZ3uO7sKap1DTCkIM795D0C9/95wsat9cnrysSSE02oQabK6RpsZU81b MdE+iiRIYc5A3IhxV+NGxS/54ZIvkuT1i4OB0V3JFnX+ID/1PkPVBqskXWUXk+LdCCte nNnWyXyy5iHQC1mxdJAjssGkRCdQsZ2CbWJ5/VmCM17qb8JU1w7mxDbbva5B5UcEDj5h 1vW1nW2LrxUzo1inILL3stuBZsv3l51q8wYRPOoXN8X3n5KuLuZG3/zOaR0XRjVPjrhz cVQA== 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=/SU5kSWakS45XtlTa0Xsm0cvs6MvgQuq1ctjJQDNZX4=; b=tN3cxuMHC7hTKxwGaMbjI2xFjKaS3WkllYI6Ku/bQh2sx5kR+81CkIhrpo7EKvgVX8 Et1eWVmi1BnKeLGNtCLfsKCuqNbUlvbJrw2odgT1EG/RSMk0qn13S1HyW4UBDUmbimgY 67acnuAqvzUEGreyrQRMV9NhL5wcDmNqXBU9V3HQOEsgoMrIgX0HxoVCnXy3TCkJF9R1 Jio/M1MXNKfqq+UeRnfu7pLWDYxe0T4W6Pr6SjvCBYUtN6kMnCvY+Nn8g00noHcxVWdo m/OTxh/BNH+KNC2/F7/T/Z3GGwz5uIU2T9FToHfe/CZXB7/ZAEHoUdHQyp9Mfcrq3BUd 1Kgg== X-Gm-Message-State: AKGB3mK5del67GUHqBIcOVvOgFy+RQHkf3LmQhllSxTt5Z6cVrW3N+Hq 3UhXht6TDvmP3EVv2M8KcmvPplR72yw0D40DcQA= X-Google-Smtp-Source: ACJfBos9rZrDyymKXvMJy0c4UoPkw6cQ0sJdmeCEd6qTEwhM5xTF5dRBLa0Oa6qgK3hr2FjJJcXU8fJA+xuBljFi/CI= X-Received: by 10.28.136.15 with SMTP id k15mr35639895wmd.147.1514924217847; Tue, 02 Jan 2018 12:16:57 -0800 (PST) MIME-Version: 1.0 Received: by 10.28.170.2 with HTTP; Tue, 2 Jan 2018 12:16:57 -0800 (PST) In-Reply-To: References: From: Kent Kuriyama Date: Tue, 2 Jan 2018 10:16:57 -1000 Message-ID: Subject: Re: zpool fragmentation To: Adam Vande More Cc: pete wright , freebsd-questions Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.25 X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 02 Jan 2018 20:17:00 -0000 This article explains the meaning of that column. https://utcc.utoronto.ca/~cks/space/blog/solaris/ZFSZpoolFragmentationMeaning On Tue, Jan 2, 2018 at 9:52 AM, Adam Vande More wrote: > On Tue, Jan 2, 2018 at 12:40 PM, pete wright wrote: > > > Hi there, > > I was wondering how others here on the list deal with zpool > > fragmentation. My general purpose laptop uses zroot, and I've noticed > > over time fragmentation of my pool has grown to %42: > > > > $ zpool list > > NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH > ALTROOT > > zroot 230G 87.3G 143G - 42% 37% 1.00x ONLINE - > > $ > > > > I guess I have two questions: > > 1) is fragmentation generally bad, or just a fact of life for a system > > with lots of churn? > > > > Yes but impact also depends on pool config. > > > > 2) if it is bad, are there any coping mechanisms people use to reduce > > fragmentation? > > > > Keep lots of free space. > > -- > Adam > _______________________________________________ > 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" > -- Kent, kent.kuriyama@gmail.com