Date: Mon, 6 Aug 2007 13:05:18 +0200 From: cpghost <cpghost@cordula.ws> To: Victor Sudakov <sudakov@sibptus.tomsk.ru> Cc: freebsd-questions@freebsd.org Subject: Re: dump -L Message-ID: <20070806110518.GA8074@epia-2.farid-hajji.net> In-Reply-To: <20070806071857.GA23813@admin.sibptus.tomsk.ru> References: <20070724115401.GA1355@admin.sibptus.tomsk.ru> <20070806025614.GA21368@admin.sibptus.tomsk.ru> <d7195cff0708052322x256816f8r1b4d5b1a30ac269f@mail.gmail.com> <20070806071857.GA23813@admin.sibptus.tomsk.ru>
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On Mon, Aug 06, 2007 at 02:18:57PM +0700, Victor Sudakov wrote: > > > > I always use "dump -L" to dump a live filesystem. > > > > However, when I restore the dump, I sometimes get messages like > > > > "foo.txt (inode 12345) not found on tape" or > > > > "expected next file 12345, got 23456" > > > > > > > > I thought this should _never_ happen when dumping a snapshot. > > > > > > > > What is it? > > > > > > Does nobody know the answer, or am I the only one experiencing the > > > problem? > > > > I don't know the answer, but I get essentially the > > same behaviour. I have never seen any data loss, > > I gave an example below. The file "wins.dat" was not dumped. It is > indeed missing from the tape. > > If this is not a data loss, what is it then? > > [root@big ~] restore -b64 -rN > ./spool/samba.lock/wins.dat: (inode 2829098) not found on tape > expected next file 267, got 4 > expected next file 2828988, got 2828987 Uh-oh :-(. I have no idea how the code works, but just a wild guess: what happens when a file is being created and a snapshot taken at the same time? Isn't there a tiny window between inode creation and directory update? Or is file creation an atomic operation w.r.t. snapshots and dump? > Victor Sudakov, VAS4-RIPE, VAS47-RIPN > sip:sudakov@sibptus.tomsk.ru Regards, -cpghost. -- Cordula's Web. http://www.cordula.ws/
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