Date: Thu, 14 Dec 2017 15:52:27 +0100 From: "O. Hartmann" <ohartmann@walstatt.org> To: Dimitry Andric <dim@FreeBSD.org> Cc: "O. Hartmann" <ohartmann@walstatt.org>, Daniel Nebdal <dnebdal@gmail.com>, FreeBSD CURRENT <freebsd-current@freebsd.org> Subject: Re: ZFS RAIDZ1: resilvering at <17.3M/s => abyssal slow ... Message-ID: <20171214155254.4736ebe5@thor.intern.walstatt.dynvpn.de> In-Reply-To: <B02D080F-96B1-4456-8D19-21F89821E2C0@FreeBSD.org> References: <20171214124900.64211bd9@thor.intern.walstatt.dynvpn.de> <CA%2Bt49PJuznLxGnLERwAhVW2CjETJYWO6rKcWo3qOo5bZLQkqYA@mail.gmail.com> <20171214144351.24a81faa@thor.intern.walstatt.dynvpn.de> <B02D080F-96B1-4456-8D19-21F89821E2C0@FreeBSD.org>
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--Sig_/hyN6twzUHfYMOSMxkitjlQ_ Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Am Thu, 14 Dec 2017 15:46:17 +0100 Dimitry Andric <dim@FreeBSD.org> schrieb: > 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: =20 > >> On Thu, Dec 14, 2017 at 12:48 PM, O. Hartmann <ohartmann@walstatt.org>= wrote: =20 > >>> I just started the rebuild/resilvering process and watch the pool crw= aling at ~ 18 > >>> MB/s. At the moment, there is no load on the array, the host is a Ivy= Bridge XEON > >>> with 4 core/8 threads and 3,4 GHz and 16 GB of RAM. The HDDs are atta= ched 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 poo= ls's zfs > >>> filesystems > >>> - I also use a SSD for ZIL/L2ARC caching, but it seems to be unused r= ecently 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 resilverin= g is in > >>> progress. > >>>=20 > >>> If the "perspective" of "zpool status" is correct, then I have to wai= t after two > >>> hours for another 100 hours - ~ 4 days? Ups ... I think there is some= thing badly > >>> misconfigured or missing. =20 > ... > >> 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. =20 >=20 > Hopefully this will get better in the future, please read: >=20 > http://open-zfs.org/wiki/Scrub/Resilver_Performance >=20 > -Dimitry >=20 It has already been started to become better ;-) After a while now, the throughput is at 128 MBytes/s and the estimated time= decreased to ~ 8 h now - that is much more appreciable than 4 days ;-) Kind regards, Oliver --=20 O. Hartmann Ich widerspreche der Nutzung oder =C3=9Cbermittlung meiner Daten f=C3=BCr Werbezwecke oder f=C3=BCr die Markt- oder Meinungsforschung (=C2=A7 28 Abs.= 4 BDSG). --Sig_/hyN6twzUHfYMOSMxkitjlQ_ Content-Type: application/pgp-signature Content-Description: OpenPGP digital signature -----BEGIN PGP SIGNATURE----- iLUEARMKAB0WIQQZVZMzAtwC2T/86TrS528fyFhYlAUCWjKQRgAKCRDS528fyFhY lOuBAgCgcbPikxGm+GdgGbMMdcsdrfuJdmrSheWxSPX5GdkinEQcPaaU4RPGMU1i duPVxun6h2CZOiTdfNEvqHYT8G7KAgCqY598Sbqk+5gXsoRVM9whewSbplC9MEF4 O9+2zS9fNUM9Ky8LryHsQKw/LlpJrzXBPhRBc8dRcl63IQDZE32D =XJAm -----END PGP SIGNATURE----- --Sig_/hyN6twzUHfYMOSMxkitjlQ_--
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