Date: Mon, 20 Oct 2008 09:48:31 -0700 From: Jeremy Chadwick <koitsu@FreeBSD.org> To: Chuck Swiger <cswiger@mac.com> Cc: freebsd-stable@freebsd.org, JoaoBR <joao@matik.com.br> Subject: Re: constant zfs data corruption Message-ID: <20081020164831.GA8016@icarus.home.lan> In-Reply-To: <98238FC8-0FC4-4410-829F-EF2EA16A57B8@mac.com> References: <200810171530.45570.joao@matik.com.br> <E3C2EAB9-12ED-4D3E-B07A-E2FF5892D26A@mac.com> <200810200837.40451.joao@matik.com.br> <20081020132208.GA3847@icarus.home.lan> <98238FC8-0FC4-4410-829F-EF2EA16A57B8@mac.com>
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On Mon, Oct 20, 2008 at 09:44:50AM -0700, Chuck Swiger wrote: > Hi, all-- > > On Oct 20, 2008, at 6:22 AM, Jeremy Chadwick wrote: > [ ...JoaoBR wrote... ] >>> well, hardware seems to be ok and not older than 6 month, also >>> happens not >>> only on one machine ... smartctl do not report any hw failures on >>> disk >>> >>> regarding jumpering the drives to 150 you suspect a driver problem? >> >> It's not because of a driver problem. There are known SATA chipsets >> which do not properly work with SATA300 (particularly VIA and SiS >> chipsets); they claim to support it, but data is occasionally >> corrupted. >> Capping the drive to SATA150 fixes this problem. >> >> http://en.wikipedia.org/wiki/Serial_ATA#SATA_1.5_Gbit.2Fs_and_SATA_3_Gbit.2Fs > > Exactly so. Just as a general principle, if you've got sporadic data > corruption, turning I/O and system busses down a notch and retesting is a > useful starting point towards identifying whether the issue is > repeatable and whether it leans towards a hardware issue or software. > However, ZFS file checksumming supposedly is code that has been > carefully reviewed and tested so when it logs problems that is supposed > to be a fairly sure sign that the hardware isn't behaving right. Hm... I thought we determined earlier in this thread that the OP is not getting the benefits of ZFS checksums because he's not using raidz (only a single disk with a single pool)? -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
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