Date: Fri, 16 May 2014 08:36:55 -0500 From: Karl Denninger <karl@denninger.net> To: freebsd-stable@freebsd.org Subject: Re: gmirror + ZFS issues Message-ID: <53761477.70205@denninger.net> In-Reply-To: <5376115D.5050704@boiteameuh.org> References: <5376115D.5050704@boiteameuh.org>
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[-- Attachment #1 --] On 5/16/2014 8:23 AM, Nicolas Haller wrote: > Hello, > > I've got a new server and I installed FreeBSD 10 on it. I have a > problem to create a new zfs pool. The command stalls on IO wait (D > state / zio->io_cv). > > The device for the pool is a 1.7T partition (index 4) of a gmirror > device. Why? ZFS provides its own mirroring and it is superior, as it checksums each block and thus does not rely on the drive returning an error to detect problems. It can also rewrite a bad block (assuming the problem is transient) and scrub also relies on independent components. You're destroying the data integrity advantage that ZFS gives you by using a gmirror under it. Stop doing that and see if your problem disappears. (In other words it sounds like the problem is real but you shouldn't be doing that anyway, so it also shouldn't bite you.) -- -- Karl karl@denninger.net [-- Attachment #2 --] 0 *H 01 0 + 0 *H O0K030 *H 01 0 UUS10UFlorida10U Niceville10U Cuda Systems LLC1 0UCuda Systems LLC CA1/0- *H customer-service@cudasystems.net0 130824190344Z 180823190344Z0[1 0 UUS10UFlorida10UKarl Denninger1!0 *H karl@denninger.net0"0 *H 0 bi՞] MNԿawx?`)'ҴcWgR@BlWh+ u}ApdCF JVй~FOL }EW^bچYp3K& ׂ(R lxڝ.xz?6 &nsJ +1v9 v/( kqĪp[vjcK%fϻe?iq]z lyzFO'ppdX//Lw(3 JI A*S#՟H[f|CGqJKoo y.oEuOw$ /섀$삻J9b|A P~8]D1YI<"""Y^T2iQ2 b yH)] Ƶ0y$ _N 6XqMC 9 XgώjGTP"#nˋ"Bk1 00 U 0 0 `HB0 U 0, `HB OpenSSL Generated Certificate0 U |8 ˴d[20 U #0]Af4 U3x&^"408 `HB+)https://cudasystems.net:11443/revoked.crl0 *H gBwH] j\x`( &gW32"Uf^. ^Iϱ k!DQA g{(w /)\N'[ oRW @C HO>)XrTNɘ!u`xt5(=f\-l3<@C6mnhv##1ŃbH͍_Nq aʷ?rk$^9TIa!kh,D -ct1 0001 0 UUS10UFlorida10U Niceville10U Cuda Systems LLC1 0UCuda Systems LLC CA1/0- *H customer-service@cudasystems.net0 + ;0 *H 1 *H 0 *H 1 140516133655Z0# *H 1@g)IHB.0l *H 1_0]0 `He*0 `He0 *H 0*H 0 *H @0+0 *H (0 +71001 0 UUS10UFlorida10U Niceville10U Cuda Systems LLC1 0UCuda Systems LLC CA1/0- *H customer-service@cudasystems.net0 *H 101 0 UUS10UFlorida10U Niceville10U Cuda Systems LLC1 0UCuda Systems LLC CA1/0- *H customer-service@cudasystems.net0 *H a]ZN ;:gJK읙00ӺKW t'qΌ,N0ϸ]<{8n MTOd [)A`ߠG4ف#Euod\_SN/ a,Ѕ-RJ0;]O?ӷ Ar;"JSM/U: 堊Sz%@%{ wД\aGsB\7:%bth m=5w %G=?0zU `Ff'ES 047+jϣLMvG4Xӹ_c 9߀:Z_+,t֑`<J i"λ-Y>uxiRߪ; L"hjFCQ2)&30W fR JQ_'ݭ\$/HU QANO=@`t?bw8^^9gf1w '!JPbepEr YvT&
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