Date: Thu, 14 Dec 2017 15:46:17 +0100 From: Dimitry Andric <dim@FreeBSD.org> To: "O. Hartmann" <ohartmann@walstatt.org> Cc: Daniel Nebdal <dnebdal@gmail.com>, FreeBSD CURRENT <freebsd-current@freebsd.org> Subject: Re: ZFS RAIDZ1: resilvering at <17.3M/s => abyssal slow ... Message-ID: <B02D080F-96B1-4456-8D19-21F89821E2C0@FreeBSD.org> In-Reply-To: <20171214144351.24a81faa@thor.intern.walstatt.dynvpn.de> References: <20171214124900.64211bd9@thor.intern.walstatt.dynvpn.de> <CA%2Bt49PJuznLxGnLERwAhVW2CjETJYWO6rKcWo3qOo5bZLQkqYA@mail.gmail.com> <20171214144351.24a81faa@thor.intern.walstatt.dynvpn.de>
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[-- Attachment #1 --] On 14 Dec 2017, at 14:43, O. Hartmann <ohartmann@walstatt.org> wrote: > > 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. >>> >>> 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. >>> >>> 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 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 [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.2 iF0EARECAB0WIQR6tGLSzjX8bUI5T82wXqMKLiCWowUCWjKOuQAKCRCwXqMKLiCW o4v2AJ4gJHlALMaEYIrmfkOEuLLTT9napACgy7miWUltzHHT7tor9utycJLTb2w= =cokX -----END PGP SIGNATURE-----
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