Date: Thu, 28 Feb 2013 14:31:29 +0400 From: Lev Serebryakov <lev@FreeBSD.org> To: Alexander Yerenkow <yerenkow@gmail.com> Cc: freebsd-fs@freebsd.org, freebsd-current@freebsd.org Subject: Re: Unexpected SU+J inconsistency AGAIN -- please, don't shift topic to ZFS! Message-ID: <583012022.20130228143129@serebryakov.spb.ru> In-Reply-To: <CAPJF9w=CZg_%2BK7NHTGUhRLaMJWWNOG7zMipGMJL6w6NoNZpSXA@mail.gmail.com> References: <1796551389.20130228120630@serebryakov.spb.ru> <1238720635.20130228123325@serebryakov.spb.ru> <1158712592.20130228141323@serebryakov.spb.ru> <CAPJF9w=CZg_%2BK7NHTGUhRLaMJWWNOG7zMipGMJL6w6NoNZpSXA@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
Hello, Alexander. You wrote 28 =C6=C5=D7=D2=C1=CC=D1 2013 =C7., 14:22:59: AY> Could you afford reproducing this? :) After half a day of memtest86+ :) I want to be sure, that it is not memory problem first. AY> Also, would be nice to know how look your setup (CPUs, how much disks, = how AY> they connected, is it hw raid, etc). Simple E4500 CPU on Q35-based desktop (ASUS) MoBo, 6GiB memory (under test now!), Samsung 500GiB SATA HDD for system, 5x2Tb WD Green (4xWD20EARS, 1xWD20EARX which replace failed WD20EARS), all disks are connected to 6 SATA ports of chipset (no RAID controller), 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). Maybe, it is subtile interference between raid5 implementation and SU+J, but in such case I want to understand what does raid5 do wrong. --=20 // Black Lion AKA Lev Serebryakov <lev@FreeBSD.org>
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?583012022.20130228143129>