Date: Fri, 1 Apr 2011 14:21:26 -0700 (PDT) From: "Chris H" <chris#@1command.com> To: freebsd-stable@freebsd.org Cc: amvandemore@gmail.com, mlerota@claresco.hr Subject: Re: Constant rebooting after power loss Message-ID: <14c23d4bf5b47a7790cff65e70c66151.HRCIM@webmail.1command.com> In-Reply-To: <AANLkTi=KEwmm1hM6Z=r_SWUAn9KhUrkTVzfF6VmqQauW@mail.gmail.com> References: <87d3l6p5xv.fsf@cosmos.claresco.hr> <AANLkTi=kEyz-mKLzdV8LAf91ZhMTP8gLKs=3Eu5WD8mh@mail.gmail.com> <874o6ip0ak.fsf@cosmos.claresco.hr> <7b15d37d28f8ddac9eb81e4390231c96.HRCIM@webmail.1command.com> <AANLkTi=KEwmm1hM6Z=r_SWUAn9KhUrkTVzfF6VmqQauW@mail.gmail.com>
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On Fri, April 1, 2011 10:38 am, Adam Vande More wrote: > On Fri, Apr 1, 2011 at 12:02 PM, Chris H <chris#@1command.com> wrote: > > >> On Fri, April 1, 2011 6:29 am, Marko Lerota wrote: >> >>> I read that ZFS don't need fsck because the files are always consistent >>> >> on filesystem regardless >>> of power loses. That the corruption can occur only if disks are damaged. >> But not >> >>> when power goes down. >> >> Complete nonsense. The information you read was false. >> >> > > No, it's really not. ZFS's lack of recovery tools at least in the > beginning were basically non existent. This is because ZFS uses a COW model > with an atomic data management unit design which by it's nature addresses thing > like fsck, and sudden power loss. However, things outside of a FS's control > still allow corrution to happen so as UPS is just as important with ZFS as your > traditional FS. Perhaps more important because the difficulty from recovering > from some types of pool corruption. > Greetings, Not to sound disagreeable, but if I interrupt the power during a disk write, no amount of ZFS will insure that the hardware completes it's write without electricity. Nor will any amount of ZFS prevent data corruption as a result of that interrupted write. > -- > Adam Vande More > > -- //////////////////////////////////////////////////// If only Western Electric had found a way to offer binary licenses for the UNIX system back in 1974, the UNIX system would be running on all PC's today rather than DOS/Windows. --en UNIX veritas! ////////////////////////////////////////////////////
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