Date: Thu, 25 Mar 2021 08:55:12 +0000 From: Matt Churchyard <matt.churchyard@userve.net> To: Mathieu Chouquet-Stringer <me+freebsd@mathieu.digital> Cc: "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org> Subject: RE: Scrub incredibly slow with 13.0-RC3 (as well as RC1 & 2) Message-ID: <33eb78e2de404a77b271880dbee4c22e@SERVER.ad.usd-group.com> In-Reply-To: <YFs3jFT7sEaGeQCe@weirdfishes> References: <YFhuxr0qRzchA7x8@weirdfishes> <202103221515.12MFFHRK015188@higson.cam.lispworks.com> <YFi6Lwh3ISn8UMvS@weirdfishes> <YFk11A/j7URClN/l@weirdfishes> <YFm3BTK/J9XY/mCN@weirdfishes> <202103241230.12OCUqur030001@higson.cam.lispworks.com> <YFs3jFT7sEaGeQCe@weirdfishes>
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-----Original Message----- From: owner-freebsd-fs@freebsd.org <owner-freebsd-fs@freebsd.org> On Behalf= Of Mathieu Chouquet-Stringer Sent: 24 March 2021 12:59 To: Martin Simmons <martin@lispworks.com> Cc: freebsd-fs@freebsd.org Subject: Re: Scrub incredibly slow with 13.0-RC3 (as well as RC1 & 2) On Wed, Mar 24, 2021 at 12:30:52PM +0000, Martin Simmons wrote: > FWIW, I think the new scrub algorithm was added in 2018. You're right, git says Wed Nov 15 20:27:01 2017 -0500 > You could try to profile it: >=20 > https://wiki.freebsd.org/DTrace/Tutorial#Lesson_9._Profile_On-CPU_Kernel_= Stacks > dtrace, hello old friend... :-) > That's the next step... Just an a aside, I did post a message a few weeks ago with a similar proble= m on 13 (as well as snapshot issues). Scrub seemed ok for a short while, bu= t then ground to a halt. It would take 10+ minutes to go 0.01%, with everyt= hing appearing fairly idle. I finally gave up and stopped it after about 20= hours. Moving to 12.2 and rebuilding the pool, the system scrubbed the sam= e data in an hour, and I've just scrubbed the same system after a month of = use with about 4 times the data in 3 hours 20. As far as I'm aware, both sh= ould be using effectively the same "new" scrub code. Will be interesting if you find a cause as I didn't get any response to wha= t for me was a complete showstopper for moving to 13. Matt --=20 Mathieu Chouquet-Stringer The sun itself sees not till heaven clears. -- William Shakespeare -- _______________________________________________ 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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