Date: Wed, 28 Sep 2016 16:44:46 -0400 From: Jon Radel <jon@radel.com> To: freebsd-questions@freebsd.org Subject: Re: upgrade to 10.3R .... Message-ID: <7adc6f3c-3167-6df9-26e8-a69e22bb49b3@radel.com> In-Reply-To: <44mvirztvd.fsf@be-well.ilk.org> References: <3d09a931-73f8-65d0-588a-70a57c812e85@hiwaay.net> <44mvirztvd.fsf@be-well.ilk.org>
next in thread | previous in thread | raw e-mail | index | archive | help
[-- Attachment #1 --]
On 9/28/16 3:50 PM, Lowell Gilbert wrote:
> "William A. Mahaffey III" <wam@hiwaay.net> writes:
>
>> are many online URLs with dire warnings about using ZFS & non-ECC RAM
>> causing data corruption (this box is a commodity desktop w/ non-ECC
>
>> 1. Are these concerns valid, i.e. founded in fact ?
>
> Sure. When you get uncorrected bit flips, you can end up corrupting your
> data or even the filesystem. That isn't unique to ZFS, of course.
>
> If the data integrity guarantees aren't the deciding reason you're using
> ZFS, then this isn't an issue. Some people use ZFS on laptops, for
> example, for other features rather than data integrity (most commonly,
> compression).
I'd argue that it isn't really an issue even if you use ZFS for data
integrity. At least not in the way many of the statements on the
Internet seem to mean it....
I've read some where you get the sense that the message is: ZFS with
non-ECC RAM means you are doomed. Any other file system with non-ECC
RAM and everything is hunky-dory. Well, no, not so much. You write
garbage in RAM to disk and you're going to have garbage on disk. Choice
of file system doesn't help with that.
I suspect that there is *some* danger of a higher chance of false
positives while scrubbing a ZFS file system using non-ECC RAM actually
inducing errors on disk instead of correcting them, and I'd find a
credible analysis of that a most interesting read, but really, given the
probability of bit error on today's very large hard drives, I'm more
worried about the long-term data stability of my disks than of my RAM.
That said, for the data I really care about, I use ZFS and ECC RAM....
--
--Jon Radel
jon@radel.com
[-- Attachment #2 --]
0 *H
010
`He 0 *H
00 #SanzTgk!0
*H
0o1 0 USE10U
AddTrust AB1&0$U AddTrust External TTP Network1"0 UAddTrust External CA Root0
141222000000Z
200530104838Z01 0 UGB10UGreater Manchester10USalford10U
COMODO CA Limited1A0?U8COMODO SHA-256 Client Authentication and Secure Email CA0"0
*H
0
zSNpR V&IQZI`zQBy"aNv#
J n=ٺ.CRC|2PȦOZϓ%{0dV*$3DiFK3@@:*S= a<UNv%!)|qvO_T{5R"=,0-1YR73i-C֥wgQ'뼥8v8ߌIs:2:=F:WtaP@?⟢! 00 U #0z4&&T$T0 U akᢠOg£ 0U 0U 0 0 U %0++0U
00U 0DU =0;09753http://crl.usertrust.com/AddTrustExternalCARoot.crl05+)0'0%+0http://ocsp.usertrust.com0
*H
*nU:Uka+ #fjow^a } [jr
AX&MX"cR6}Xޫ;cs{B#ʶM>K-ػBKiۦ74{:ǟO4ne6d)5ֱqC>2Svʆ4, Jؙ
␒ZBj#!eջ~ꌅ b:,Yř38z yJ&|00sT<}k
`i
0
*H
01 0 UGB10UGreater Manchester10USalford10U
COMODO CA Limited1A0?U8COMODO SHA-256 Client Authentication and Secure Email CA0
150330000000Z
180329235959Z01 0 UUS10 U221501 0 UVA10U Springfield10U 6917 Ridgeway Dr.10U
Jon T. Radel1200U )Issued through Jon T. Radel E-PKI Manager1 0 U Corporate Secure Email10U Jon Radel1 0 *H
jon@radel.com0"0
*H
0
aЩ@@g3eGރ͛; d#>q7&Hf
:3vL" jV#Xݷ>U-H[$SUڻ{Ϝ,z¶IchO=rcyr n v.Vh7k;%ueYuӬnz 6!| !Aȡ+,u+
CAպF-un#vjUJWnk%j]
2JPkl 00 U #0akᢠOg£ 0 U E|GDp/ʚB0U 0 U 0 0 U %0++0FU ?0=0; +10+0)+ https://secure.comodo.net/CPS0]U V0T0RPNLhttp://crl.comodoca.com/COMODOSHA256ClientAuthenticationandSecureEmailCA.crl0+00X+0Lhttp://crt.comodoca.com/COMODOSHA256ClientAuthenticationandSecureEmailCA.crt0$+0http://ocsp.comodoca.com0U 0
jon@radel.com0
*H
KS `?H_D`8G߿ VbĘ<tB-Ӈї|{'Ũݹg0Gp$%F(;*MO*gt$@ t6,?0|#ăz,&! {j2i[%b7ߪP+9G㲍["y<?8rZ'[UR6%L̤
w"=:L~Ƨ^jf36 OP1.}(e1A0=001 0 UGB10UGreater Manchester10USalford10U
COMODO CA Limited1A0?U8COMODO SHA-256 Client Authentication and Secure Email CAsT<}k
`i
0
`He a0 *H
1 *H
0 *H
1
160928204446Z0/ *H
1" .ǕR z}c
-۹ PPZKa0l *H
1_0]0 `He*0 `He0
*H
0*H
0
*H
@0+0
*H
(0 +71001 0 UGB10UGreater Manchester10USalford10U
COMODO CA Limited1A0?U8COMODO SHA-256 Client Authentication and Secure Email CAsT<}k
`i
0 *H
101 0 UGB10UGreater Manchester10USalford10U
COMODO CA Limited1A0?U8COMODO SHA-256 Client Authentication and Secure Email CAsT<}k
`i
0
*H
#$R#b:sgN|e|fH8SՐ\%ڋ
.w7o 払 gagfyfșJ ? iq/l
'`-k*:ת,;pǃ*僷fĹ,t MJ 缙gJX3; SSbSa{BV7Vءq%y.O?8?yBGyWg 1J vJF`kFѡH JjtAu
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?7adc6f3c-3167-6df9-26e8-a69e22bb49b3>