"echo 0 $(blockdev --getsize /dev/loop0) snapshot /dev/loop0 /dev/loop1 n 64 | dmsetup create testcow"
I use the above command to create a testcow, I dont find how to use snapshot on dmsetup, so in my understanding, testcow will be setup as /dev/loop0 for reading and /dev/loop1 for writing. does it correct? is there any manual on how to use snapshot?
and could anyone tell me , how to merge this two device's contents after I made some writing on testcow?
Thanks!
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