Date: Tue, 4 Aug 2020 08:54:41 -0700 From: Matthew Ahrens <matt@delphix.com> To: Steve Wills <swills@freebsd.org> Cc: freebsd-fs <freebsd-fs@freebsd.org>, George Wilson <george.wilson@delphix.com> Subject: Re: zfs scrub enable by default Message-ID: <CAJjvXiEXEdAFXpXkGvt4fymA17kNdp6XkZV5taGKLoP2GvMHbw@mail.gmail.com> In-Reply-To: <cca34d1a-1892-41ec-ce45-84865100c6e1@FreeBSD.org> References: <cca34d1a-1892-41ec-ce45-84865100c6e1@FreeBSD.org>
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This question was raised elsewhere, and I agree with this reply from George Wilson, my colleague and an expert in the i/o subsystems of ZFS as well as having lots of experience with customers: Having scrubs enabled by default is a great idea but at Sun (and Delphix > too) we found that the impact was often too much for some > workloads/customers. This is the challenge we faced and why there was never > a policy to enable it everywhere. We did explore ideas to make the impact > less and to be able to always scrub. Some of those ideas included periodic > or continuous scrubs where the impact could be reduced by only scrubbing > portions of the pool at a time, at a reduced i/o rate. At Delphix, we have > investigated similar concepts and one of our interns prototyped one of the > ideas.Much has changed since the early scrub days and revisiting some of > the earlier ideas and investigating new ones is probably a good topic for > the community. I do think that just enabling scrub by default without > further enhancements would still be too impactful for some customers but > the concept definitely has merit. --matt On Mon, Aug 3, 2020 at 9:10 AM Steve Wills <swills@freebsd.org> wrote: > Hi, > > I wonder why we don't enable zfs periodic scrub by default? > > > https://svnweb.freebsd.org/base/head/usr.sbin/periodic/periodic.conf?view=markup#l162 > > Anyone happen to know? > > Thanks, > Steve > > _______________________________________________ > freebsd-fs@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-fs > To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org" >
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