[linux-lvm] changed block for snapshots

Mikhail Malamud mmalamud at freedomoss.com
Thu May 27 13:53:27 UTC 2010

I am trying to understand how snapshots work but I guess I am stuck on what consitutes a changed block. A block that written to, even with the same data as before. Or block what actually has modified data. What method does LVM use to decide whether block has been changed or not. 


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