Date: Wed, 27 Apr 2016 01:50:17 -0400 From: "Michael B. Eichorn" <ike@michaeleichorn.com> To: DH <dhutch9999@yahoo.com>, Miroslav Lachman <000.fbsd@quip.cz> Cc: freebsd-fs@freebsd.org Subject: Re: How to speed up slow zpool scrub? Message-ID: <1461736217.1121.17.camel@michaeleichorn.com> In-Reply-To: <381846248.2672053.1461695277122.JavaMail.yahoo@mail.yahoo.com> References: <381846248.2672053.1461695277122.JavaMail.yahoo.ref@mail.yahoo.com> <381846248.2672053.1461695277122.JavaMail.yahoo@mail.yahoo.com>
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[-- Attachment #1 --] On Tue, 2016-04-26 at 18:27 +0000, DH via freebsd-fs wrote: > Take a long look at the FreeNAS documentation and discussion threads > - if you're not using a sufficient quantity of ECC ram with ZFS > you're asking for anomalous behavior. I'm not a ZFS expert, but the > documentation leads me to think inadequate system ram is certainly a > consideration. > > FreeNAS requires a minimum of 8 GB of ECC ram when used with ZFS. <begin friendly infodump> It does not *need* to be ECC ram, ECC is just *highly recommended*. As one of the key features of zfs is bitrot prevention, it makes sense to protect against bitrot everywhere. Zfs (and thus freenas) is just fine with non-ecc ram. Just, like for any filesystem if the bit is flipped in ram it will be recorded as such on disk. And 8 GB is probably a safe minumum without tuning, but there are sufficent tunnables to do ~4 GB easily. This is not saying that you are incorrect about best practice, I am just picking nits since ECC and minium RAM are can be one of the more sensitive topics for ZFS-enthusiasts. [-- Attachment #2 --] 0 *H 010 `He 0 *H 000]0 *H 01 0 UIL10U StartCom Ltd.1+0)U "Secure Digital Certificate Signing1806U/StartCom Class 1 Primary Intermediate Client CA0 150613202446Z 160614003550Z0H1 0 U ike@michaeleichorn.com1%0# *H ike@michaeleichorn.com0"0 *H 0 UՀ,k9D %Z|Y6J<rrK g;&|uNlUE9)V.[ט̊:qS](#v SYDz* CpugYݔ,v<`j(w aS#ڒ6n(K5'KVLåErv< J=[}W bLA%gޭnVb| I?M7D :$׃bM_T[,ƃ\ 00 U 0 0 U 0 U %0++0 U jj: γ+39啖0 U #0Sr풜\|~5NԸQ0!U 0ike@michaeleichorn.com0LU C0?0; +70*0.+"http://www.startssl.com/policy.pdf0+00' StartCom Certification Authority0This certificate was issued according to the Class 1 Validation requirements of the StartCom CA policy, reliance only for the intended purpose in compliance of the relying party obligations.06U /0-0+)'%http://crl.startssl.com/crtu1-crl.crl0+009+0-http://ocsp.startssl.com/sub/class1/client/ca0B+06http://aia.startssl.com/certs/sub.class1.client.ca.crt0#U 0http://www.startssl.com/0 *H x+ȐF}pw.X vF?rg P]EOp)L˻yA ;hi0u2]m [Sbp$_ gr Xm*YP3 #H>mKAǠt)HO|=@} 3ӝ'iO81> 03 v'h5U "H;ECZtpҗ4rWHu^6+i*kJL8shAV|5;?HMc\ j[j|+000]0 *H 01 0 UIL10U StartCom Ltd.1+0)U "Secure Digital Certificate Signing1806U/StartCom Class 1 Primary Intermediate Client CA0 150613202446Z 160614003550Z0H1 0 U ike@michaeleichorn.com1%0# *H ike@michaeleichorn.com0"0 *H 0 UՀ,k9D %Z|Y6J<rrK g;&|uNlUE9)V.[ט̊:qS](#v SYDz* CpugYݔ,v<`j(w aS#ڒ6n(K5'KVLåErv< J=[}W bLA%gޭnVb| I?M7D :$׃bM_T[,ƃ\ 00 U 0 0 U 0 U %0++0 U jj: γ+39啖0 U #0Sr풜\|~5NԸQ0!U 0ike@michaeleichorn.com0LU C0?0; +70*0.+"http://www.startssl.com/policy.pdf0+00' StartCom Certification Authority0This certificate was issued according to the Class 1 Validation requirements of the StartCom CA policy, reliance only for the intended purpose in compliance of the relying party obligations.06U /0-0+)'%http://crl.startssl.com/crtu1-crl.crl0+009+0-http://ocsp.startssl.com/sub/class1/client/ca0B+06http://aia.startssl.com/certs/sub.class1.client.ca.crt0#U 0http://www.startssl.com/0 *H x+ȐF}pw.X vF?rg P]EOp)L˻yA ;hi0u2]m [Sbp$_ gr Xm*YP3 #H>mKAǠt)HO|=@} 3ӝ'iO81> 03 v'h5U "H;ECZtpҗ4rWHu^6+i*kJL8shAV|5;?HMc\ j[j|+040 0 *H 0}1 0 UIL10U StartCom Ltd.1+0)U "Secure Digital Certificate Signing1)0'U StartCom Certification Authority0 071024210155Z 171024210155Z01 0 UIL10U StartCom Ltd.1+0)U "Secure Digital Certificate Signing1806U/StartCom Class 1 Primary Intermediate Client CA0"0 *H 0 -).2AUGo#G B|NDRpM-B=o -we5JQpa>O.#._<V [~**pz~3WG .ᘟMlr[<Ce6fqO"uxfWN#uicgkv$Lb%y`_{`xK'GN 00U 00U 0 U Sr풜\|~5NԸQ0 U #0N @[i04hCA0f+Z0X0'+0http://ocsp.startssl.com/ca0-+0!http://www.startssl.com/sfsca.crt0[U T0R0'%#!http://www.startssl.com/sfsca.crl0'%#!http://crl.startssl.com/sfsca.crl0U y0w0u +70f0.+"http://www.startssl.com/policy.pdf04+(http://www.startssl.com/intermediate.pdf0 *H }x,\c^ #wMq}>UK/^yX֏y frMIŲB61ymQҨݬZ0& ;@#13qۑ& ̢o 6r_;GO>*I( 74XS1r3)!LJy6Kotˆ# _wSr ;B ADp(fs 䰷6%.W0J3:bC<8t X1<Cn=t==wST~\wkBf|15zUP)(IjVB!OfI=bb\4-*em/нSJm7N[]'@ڽ D9Kr>R7/|o^I@ټ'Pa $ z9a'L)( I}vcH]۸D*W} m>Q|C.(,lQ10{001 0 UIL10U StartCom Ltd.1+0)U "Secure Digital Certificate Signing1806U/StartCom Class 1 Primary Intermediate Client CA]0 `He 0 *H 1 *H 0 *H 1 160427055017Z0/ *H 1" qOdd+%\\1WM2_0 +71001 0 UIL10U StartCom Ltd.1+0)U "Secure Digital Certificate Signing1806U/StartCom Class 1 Primary Intermediate Client CA]0 *H 101 0 UIL10U StartCom Ltd.1+0)U "Secure Digital Certificate Signing1806U/StartCom Class 1 Primary Intermediate Client CA]0 *H (် y%8Ͼ , ~(+P.lDƳ@!BkT}>%-[mq'G}IK qd=i7L. / MNs 5Ua|% kD ,p.QC)j f`^7 uSIi`TY >>* "oGf?^P62-OPvzm'Y<&O<
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