Am Thu, 14 Dec 2017 15:46:17 +0100 Dimitry Andric <d...@freebsd.org> schrieb:
> On 14 Dec 2017, at 14:43, O. Hartmann <ohartm...@walstatt.org> wrote: > > > > Am Thu, 14 Dec 2017 14:09:39 +0100 > > Daniel Nebdal <dneb...@gmail.com> schrieb: > >> On Thu, Dec 14, 2017 at 12:48 PM, O. Hartmann <ohartm...@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 > 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 -- O. Hartmann Ich widerspreche der Nutzung oder Übermittlung meiner Daten für Werbezwecke oder für die Markt- oder Meinungsforschung (§ 28 Abs. 4 BDSG).
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