Date: Mon, 3 Aug 2020 14:11:06 -0400 From: Karl Denninger <karl@denninger.net> To: freebsd-fs@freebsd.org Subject: Re: zfs scrub enable by default Message-ID: <b5134ae8-1f3f-25b4-b668-235905a9dca8@denninger.net> In-Reply-To: <0BF85C14-5671-4779-928A-34C5FD3B82C1@lysator.liu.se> References: <cca34d1a-1892-41ec-ce45-84865100c6e1@FreeBSD.org> <20200803121444.J57111@mulder.mintsol.com> <0BF85C14-5671-4779-928A-34C5FD3B82C1@lysator.liu.se>
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This is a cryptographically signed message in MIME format. --------------ms090202070506070700040702 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 8/3/2020 14:05, Peter Eriksson wrote: > On our pretty big ZFS fileservers (home directories) we run scrubs manu= ally but every now and then - but I have a script that pauses the scrubs = during =E2=80=9Cprime time=E2=80=9D since a full scrub run takes a day or= so... > > > Crontab: > > # zpool-scrub-pause > 0 8 * * 1-5 /sbin/zpool-scrub pause all >/var/liu/log/zpool-scrub-pause= 2>&1 > # zpool-scrub-resume > 0 21 * * 1-5 /sbin/zpool-scrub resume all >/var/liu/log/zpool-scrub-res= ume 2>&1 > > > The script can be downloaded from: > > https://www.grebo.net/~peter/zfs/ <https://www.grebo.net/~peter/zfs= /> > > > Perhaps something similar could be used with configurable =E2=80=9Cprim= e time hours=E2=80=9D)? > > - Peter > > >> On 3 Aug 2020, at 18:35, Walter Cramer <wfc@mintsol.com> wrote: >> >> Assuming a fairly-idle system, or one with a tiny zpool - scrubs from = 'periodic daily' can work fine. >> >> In cases where that assumption is false - the resources consumed by an= hours-long scrub, slowing down a system which people expect to be "as re= sponsive as it usually it"... >> >> Our defaults should try to minimize the nasty surprises. >> >> -Walter >> >> >> On Mon, 3 Aug 2020, Steve Wills 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=3Dmarkup#l162 >>> >>> Anyone happen to know? >>> >>> Thanks, >>> Steve I will pipe up AGAINST making this a default "do on its own" thing. It is trivially automated in the cron, and this allows it to be tailored = by the load pattern and expectations of the individual configuration.=C2=A0= =C2=A0=20 A documentation entry explaining the value and need to do it on *some*=20 sort of schedule makes sense, but automating it is IMHO just begging for = trouble. The "very small" ZFS system (where there's no actual enhancement to=20 redundancy) is one degenerate case where a noted error can only tell you = that you need to find the impacted file(s) and restore them from backup, = since there is no ability to work around the fault.=C2=A0 On the other ha= nd=20 larger systems where the time required to complete a scan impacts=20 "working hours" (whatever that means in the context of the usual load)=20 will be materially impacted by an automated scan in most cases, and thus = should be hand-tuned anyway. --=20 Karl Denninger karl@denninger.net <mailto:karl@denninger.net> /The Market Ticker/ /[S/MIME encrypted email preferred]/ --------------ms090202070506070700040702 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgMFADCABgkqhkiG9w0BBwEAAKCC 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