From owner-freebsd-current@freebsd.org Thu Dec 14 14:46:58 2017 Return-Path: <owner-freebsd-current@freebsd.org> Delivered-To: freebsd-current@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 50F88E82D5C for <freebsd-current@mailman.ysv.freebsd.org>; Thu, 14 Dec 2017 14:46:58 +0000 (UTC) (envelope-from dim@FreeBSD.org) Received: from tensor.andric.com (tensor.andric.com [87.251.56.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "tensor.andric.com", Issuer "COMODO RSA Domain Validation Secure Server CA" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 0C90766E57 for <freebsd-current@freebsd.org>; Thu, 14 Dec 2017 14:46:57 +0000 (UTC) (envelope-from dim@FreeBSD.org) Received: from coleburn.avinity.tv (unknown [77.95.97.98]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by tensor.andric.com (Postfix) with ESMTPSA id CD94DDC24; Thu, 14 Dec 2017 15:46:16 +0100 (CET) From: Dimitry Andric <dim@FreeBSD.org> Message-Id: <B02D080F-96B1-4456-8D19-21F89821E2C0@FreeBSD.org> Content-Type: multipart/signed; boundary="Apple-Mail=_0B389644-E165-49B5-B164-D2414AC648AA"; protocol="application/pgp-signature"; micalg=pgp-sha1 Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\)) Subject: Re: ZFS RAIDZ1: resilvering at <17.3M/s => abyssal slow ... Date: Thu, 14 Dec 2017 15:46:17 +0100 In-Reply-To: <20171214144351.24a81faa@thor.intern.walstatt.dynvpn.de> Cc: Daniel Nebdal <dnebdal@gmail.com>, FreeBSD CURRENT <freebsd-current@freebsd.org> To: "O. Hartmann" <ohartmann@walstatt.org> References: <20171214124900.64211bd9@thor.intern.walstatt.dynvpn.de> <CA+t49PJuznLxGnLERwAhVW2CjETJYWO6rKcWo3qOo5bZLQkqYA@mail.gmail.com> <20171214144351.24a81faa@thor.intern.walstatt.dynvpn.de> X-Mailer: Apple Mail (2.3273) X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: Discussions about the use of FreeBSD-current <freebsd-current.freebsd.org> List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-current>, <mailto:freebsd-current-request@freebsd.org?subject=unsubscribe> List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current/> List-Post: <mailto:freebsd-current@freebsd.org> List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help> List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-current>, <mailto:freebsd-current-request@freebsd.org?subject=subscribe> X-List-Received-Date: Thu, 14 Dec 2017 14:46:58 -0000 --Apple-Mail=_0B389644-E165-49B5-B164-D2414AC648AA Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii On 14 Dec 2017, at 14:43, O. Hartmann <ohartmann@walstatt.org> wrote: >=20 > Am Thu, 14 Dec 2017 14:09:39 +0100 > Daniel Nebdal <dnebdal@gmail.com> schrieb: >> On Thu, Dec 14, 2017 at 12:48 PM, O. Hartmann = <ohartmann@walstatt.org> wrote: >>> I just started the rebuild/resilvering process and watch the pool = crwaling at ~ 18 >>> MB/s. At the moment, there is no load on the array, the host is a = IvyBridge XEON with >>> 4 core/8 threads and 3,4 GHz and 16 GB of RAM. The HDDs are attached = to a on-board >>> SATA II (300 MB/s max) Intel chip - this just for the record. >>>=20 >>> Recently, I switch on the "sync" attribute on most of the defined = pools's zfs >>> filesystems >>> - I also use a SSD for ZIL/L2ARC caching, but it seems to be unused = recently in >>> FreeBSD CURRENT's ZFS - this from a observers perspective only. >>>=20 >>> When scrubbing, I see recently also reduced performance on the pool, = so I'm wondering >>> about the low throughput at the very moment when resilvering is in = progress. >>>=20 >>> If the "perspective" of "zpool status" is correct, then I have to = wait after two hours >>> for another 100 hours - ~ 4 days? Ups ... I think there is something = badly >>> misconfigured or missing. ... >> This is kind of to be expected - for whatever reason, resilvers seem >> to go super slow at first and then speed up significantly. Just don't >> ask me how long "at first" is - I'd give it several (more) hours. Hopefully this will get better in the future, please read: http://open-zfs.org/wiki/Scrub/Resilver_Performance -Dimitry --Apple-Mail=_0B389644-E165-49B5-B164-D2414AC648AA Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.2 iF0EARECAB0WIQR6tGLSzjX8bUI5T82wXqMKLiCWowUCWjKOuQAKCRCwXqMKLiCW o4v2AJ4gJHlALMaEYIrmfkOEuLLTT9napACgy7miWUltzHHT7tor9utycJLTb2w= =cokX -----END PGP SIGNATURE----- --Apple-Mail=_0B389644-E165-49B5-B164-D2414AC648AA--