Date: Thu, 14 Dec 2017 12:48:33 +0100 From: "O. Hartmann" <ohartmann@walstatt.org> To: FreeBSD CURRENT <freebsd-current@freebsd.org> Subject: ZFS RAIDZ1: resilvering at <17.3M/s => abyssal slow ... Message-ID: <20171214124900.64211bd9@thor.intern.walstatt.dynvpn.de>
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--Sig_/VsbDYHS9F7SJap/dAyzdh_s Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hello out there, I had to replace a HDD on a RAIDZ1 pool comprised from 4 HDDs, each 3 TB (n= etto size of the pool is about 8-9 TB, the used amount is reported to be ~ 6TB). 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 S= ATA II (300 MB/s max) Intel chip - this just for the record. Recently, I switch on the "sync" attribute on most of the defined pools's z= fs filesystems - I also use a SSD for ZIL/L2ARC caching, but it seems to be unused recentl= y in FreeBSD CURRENT's ZFS - this from a observers perspective only. 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. If the "perspective" of "zpool status" is correct, then I have to wait afte= r two hours for another 100 hours - ~ 4 days? Ups ... I think there is something badly = misconfigured or missing. The pool is not "tuned" in any very sophisticated way, since I trust the ke= rnels ability to scale automatically - if I'm not wrong for amd64 ... Are there any aspects to look at? Thanks in advance, 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_/VsbDYHS9F7SJap/dAyzdh_s Content-Type: application/pgp-signature Content-Description: OpenPGP digital signature -----BEGIN PGP SIGNATURE----- iLUEARMKAB0WIQQZVZMzAtwC2T/86TrS528fyFhYlAUCWjJlLAAKCRDS528fyFhY lOueAf0V9/0DfpjuMjR+Zaqs2P2bkD1/AMsPjDwtOBgp29Dgjl0qOX1Vf7AKFmVj HE82ZqxG/TpMu5zw7M8PhiLnqRYWAf0QzIIQVr7fv4WmTfYRLBsSwBFzrOwZrpli H/nwaAn1ZJV96wrvmCgYoqspbRWw/R2zN9gGCGRUjUhzFlM/bJsH =HMQZ -----END PGP SIGNATURE----- --Sig_/VsbDYHS9F7SJap/dAyzdh_s--
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