Date: Mon, 22 Feb 2010 12:34:07 -0500 From: Jerry McAllister <jerrymc@msu.edu> To: Aiza <aiza21@comclark.com> Cc: freebsd-questions <questions@freebsd.org>, Dan Nelson <dnelson@allantgroup.com> Subject: Re: Dump questions Message-ID: <20100222173407.GA44738@gizmo.acns.msu.edu> In-Reply-To: <4B80E4AF.3040204@comclark.com> References: <4B80ABBA.9000707@comclark.com> <20100221061449.GK70798@dan.emsphone.com> <4B80E4AF.3040204@comclark.com>
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On Sun, Feb 21, 2010 at 03:45:51PM +0800, Aiza wrote: > Dan Nelson wrote: > >In the last episode (Feb 21), Aiza said: > >>1. Using the -L flag to create a snapshot of the > >>live running file system. > >> > >>Does this mean that a complete copy of the file > >>system is written to .snap directory? > > > >No; that would be a "copy". Snapshots only copy blocks as they are > >modified > >on the parent filesystem, so their size is determined by how much data is > >modified since the snapshot was created. > > > So how does this interact with the dump process? > > Dump start reading and writing its dump file and as the live system > changes the changes are written to the .snap and when dump completes it > overwrites it dump with the changes from the .snap??? No. > > How does this process work in detail? Go back and read the good and quite complete description someone put in about how snapshotting works a while back in this thread. I think it was Matthew Seaman, but I don't remember for sure. ////jerry > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org"
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