Dump questions

Jerry McAllister jerrymc at msu.edu
Mon Feb 22 17:36:39 UTC 2010

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???


> 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.


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