Date: Wed, 9 Oct 2013 16:32:00 +0200 From: Piotr Kucharski <piotr.kucharski@42.pl> To: Adam Vande More <amvandemore@gmail.com> Cc: freebsd-fs@freebsd.org Subject: Re: very slow zfs scrub Message-ID: <CAOuVJitSafkBUA_bZhHFfZWGbQCXoa-7F-6esAb70zyELEpaBw@mail.gmail.com> In-Reply-To: <BANLkTi=4OZr8WnRPdkn4=yULnZR%2BtjBFgA@mail.gmail.com> References: <AANLkTim6z5KiceXQE-DHt51TBs%2BSO8NNLpi7fYBTwXpE@mail.gmail.com> <AANLkTimDqcdNv0DqyScEQU3Fw=t9xtOaAZqy2BfWNhpw@mail.gmail.com> <AANLkTik%2BUhMSfGgNPr=qd_Rfwb-12aXHWGAJnNGQH2j=@mail.gmail.com> <AANLkTikjKwee9o2RGa1NLFHodV6kEVkSfSsNEw_25yMZ@mail.gmail.com> <BANLkTi=4OZr8WnRPdkn4=yULnZR%2BtjBFgA@mail.gmail.com>
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I was checking on it infrequently and now, almost 3 years later, it seems to have been fixed. :) Scrub in progress for 50h, 6.86T scanned out of 11.6T at 40M/s, 34h43m to go, 0 repaired, 59.18% done. Each 0.01T varies in speed, from 5M/s (fortunately, very rare) to 85M/s, but average of 40M/s is good enough to let it finish (for the first time in this filesystem history! :>) I did not change hardware nor ggate setup, "only" FreeBSD got upgraded, now it is FreeBSD 9.1-STABLE #75 r251912 with no patches. Just informing so it does not scare people if they stumble upon this thread. :) On 19 May 2011 18:29, Piotr Kucharski <piotr.kucharski@42.pl> wrote: > On Thu, Feb 24, 2011 at 21:00, Adam Vande More <amvandemore@gmail.com> > wrote: > >> Wow! What does scrub do that it slows ggate drive almost to halt? > >> > >> What can I do to fix it? > > > > I think network latency is going to have huge impact on performance here. > > Have you tried any ggate or nic tuning? Would HAST be an option for > you? I > > think it has more performance thought put into it. > > > > Well, the network seems rather idle, host and client share the same > 1Gb LAN (not sure if the same switch, though) with <0.2ms rtt for 1k > packets in ping. When not scrubbing, sequential reads are > satisfactory. I'm inclined to think some read or write pattern of > scrub that is causing ggate to suck immensely. :/ >
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