[linux-lvm] how to know snapshot internal structure?

[Ming Zhang]

Hi folks,

a snapshot on an existing lv keeps all the delta right? i guess snapshot
will keep a in memory look up table for this. but during system reboot,
this information should have a on-disk copy as well. is there any doc or
hint about the on disk location and structure? i guess it is part of the
snapshot area.

open the lv will read all new data and all unchanged data. open the
snapshot will read all old data. so is there any quick way to know what
exactly the delta are?

thanks a lot.


ming