Date: Tue, 8 Jan 2008 01:17:03 +0800 From: "Tz-Huan Huang" <tzhuan@csie.org> To: ticso@cicely.de Cc: freebsd-fs@freebsd.org, Brooks Davis <brooks@freebsd.org> Subject: Re: ZFS i/o errors - which disk is the problem? Message-ID: <6a7033710801070917w4b453f10l7115bd9fe3a53a1b@mail.gmail.com> In-Reply-To: <20080107135925.GF65134@cicely12.cicely.de> References: <477B16BB.8070104@freebsd.org> <20080102070146.GH49874@cicely12.cicely.de> <477B8440.1020501@freebsd.org> <200801031750.31035.peter.schuller@infidyne.com> <477D16EE.6070804@freebsd.org> <20080103171825.GA28361@lor.one-eyed-alien.net> <6a7033710801061844m59f8c62dvdd3eea80f6c239c1@mail.gmail.com> <20080107135925.GF65134@cicely12.cicely.de>
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2008/1/7, Bernd Walter <ticso@cicely12.cicely.de>: > The data is corrupted by controller and/or disk subsystem. > You have no other data sources for the broken data, so it is lost. > The only garantied way is to get it back from backup. > Maybe older snapshots/clones are still readable - I don't know. > Nevertheless data is corrupted and that's the purpose for alternative > data sources such as raidz/mirror and at last backup. > You shouldn't have ignored those errors at first, because you are > running with faulty hardware. > Without ZFS checksumming the system would just process the broken > data with unpredictable results. > If all those errors are fresh then you likely used a broken RAID > controller below ZFS, which silently corrupted syncronity and then > blow when disk state changed. > Unfortunately many RAID controllers are broken and therefor useless. Hi, Thank you very much for your answer. We have run the self-test for all raid controllers and they all reported ok. Do you mean that many raid controllers are broken (buggy?) even if the self-test is passed? If all the disks are pass-through to the zfs, is it the safe way to use the buggy controllers? Thank you very much. Sincerely yours, Tz-Huan
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