Date: Thu, 28 Feb 2013 15:19:38 +0100 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-current@freebsd.org Cc: freebsd-fs@freebsd.org Subject: Re: Unexpected SU+J inconsistency AGAIN -- please, don't shift topic to ZFS! Message-ID: <kgnp1n$9mc$1@ger.gmane.org> In-Reply-To: <583012022.20130228143129@serebryakov.spb.ru> References: <1796551389.20130228120630@serebryakov.spb.ru> <1238720635.20130228123325@serebryakov.spb.ru> <1158712592.20130228141323@serebryakov.spb.ru> <CAPJF9w=CZg_%2BK7NHTGUhRLaMJWWNOG7zMipGMJL6w6NoNZpSXA@mail.gmail.com> <583012022.20130228143129@serebryakov.spb.ru>
next in thread | previous in thread | raw e-mail | index | archive | help
This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig98A32AB29871B72452708C01 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 28/02/2013 11:31, Lev Serebryakov wrote: > WD disks are in software RAID5 with geom_raid5 (from ports, but I'm > active maintainer of it). > Disks are in "Default" configuration: WC and NCQ are enabled. > > I know, that FS guys could blame geom_raid5, as it could delay real > write up to 15 seconds, but it never "lies" about writes (it doesn't > mark BIOs complete till they are really sent to disk) and I could > not reproduce any problems with it on many hours tests on VMs (and I > don't want to experiment a lot on real hardware, as it contains my > real data). >=20 > Maybe, it is subtile interference between raid5 implementation and > SU+J, but in such case I want to understand what does raid5 do > wrong. You guessed correctly, I was going to blame geom_raid5 :) Is this a production setup you have? Can you afford to destroy it and re-create it for the purpose of testing, this time with geom_raid3 (which should be synchronous with respect to writes)? --------------enig98A32AB29871B72452708C01 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAlEvZ3oACgkQ/QjVBj3/HSyFKACfV8HYl5TsfYf2Zx48xxQnClEX 4rsAnRd5VSb35co21+ol3qCfTk9TpMbW =KjTe -----END PGP SIGNATURE----- --------------enig98A32AB29871B72452708C01--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?kgnp1n$9mc$1>