Date: Tue, 5 Feb 2008 13:06:28 -0600 From: Brooks Davis <brooks@freebsd.org> To: Joe Peterson <joe@skyrush.com> Cc: freebsd-fs@freebsd.org, Dag-Erling Sm??rgrav <des@des.no>, Brooks Davis <brooks@freebsd.org> Subject: Re: Forcing full file read in ZFS even when checksum error encountered Message-ID: <20080205190628.GA86728@lor.one-eyed-alien.net> In-Reply-To: <47A8B24D.9050904@skyrush.com> References: <47A73C8D.3000107@skyrush.com> <86prvby5o1.fsf@ds4.des.no> <47A864D9.4060504@skyrush.com> <864pcnxz8f.fsf@ds4.des.no> <47A88ADE.7050503@skyrush.com> <86abmfwc6h.fsf@ds4.des.no> <20080205173102.GA85735@lor.one-eyed-alien.net> <47A8B24D.9050904@skyrush.com>
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--7JfCtLOvnd9MIVvH Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Feb 05, 2008 at 12:00:29PM -0700, Joe Peterson wrote: > Brooks Davis wrote: > > We've also experienced several situations were zfs was detecting > > corruption caused by bad cabling or bad controller firmware so SMART had > > nothing to report. >=20 > Were the errors sporadic/intermittent? I'd think that if it was cabling,= the > checksum error could happen some times and not others. Mine seems to be > predictable and always there... Also, no error was reported when the fil= e was > written, and I think ZFS checks after writing. Strange. This is one rea= son > why I'm very curious which bits are bad. I'm not sure if they were consistent. We didn't really care since either t= he data one the disk was platter wasn't the data we put there or we couldn't r= ead reliably. We've not seen any checksum errors (in our somewhat limited experience) that weren't a symptom of a real, underlying problem. -- Brooks --7JfCtLOvnd9MIVvH Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (FreeBSD) iD8DBQFHqLOzXY6L6fI4GtQRAnNnAJoCZqqBdXS6DF3H4N4+QxXgF42UxACg3anr W9puMMUQ98Rq9hDD57Ay8u0= =o34K -----END PGP SIGNATURE----- --7JfCtLOvnd9MIVvH--
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