On Mon, Apr 20, 2015 at 02:15:47PM +0000, sri wrote: > Hi, > > I have a subvolume with only one file (file.txt) with 5Mb size. > under /btrfs/subvol1/ > 1) > I have created 1st snapshot /btrfs/snap1_subvol1. Then I ran "btrfs > send" and given -f out1.img > > size of out1.img is 5Mb. > > 2) > Next, I have appended 1Mb data to file.txt > > And again created snapshot /btrfs/snap2_subvol2. And rand "btrfs send" > out put to file out2.img > > 3) > After that I ran "btrfs send -p /btrfs/snap1_subvol1 > /btrfs/snap2_subvol1 -f outwith_poption.img. > > Beween out1.img and out2.img there is difference of 1Mb > > I would like to know what is the difference between out2.img and > outwith_poption.img ? > > When I do btrfs send to a file, is there a way to send only changes to > new file i.e. for step 2 and step 1, out2.img is 6Mb and out1.img is > 5Mb.
Basically, do exactly what you did with step 3. -p is the base subvolume, and only the differences from that are sent. Hugo. > can I get difference if the file and use it as input to btrfs receive > option if I want to recover incremental recover i.e out1.img + 1Mb ?? > > Here with my steps I can give only out2.img which is of 6Mb or out1.img > which is of 5Mb. > So for incremetal backup, it consumes total of 11Mb. > I want a way to reduce it to total of 6Mb but there should a way to > recover from fist snapshot dump and second snapshot dump as well. -- Hugo Mills | UDP jokes: It's OK if no-one gets them. hugo@... carfax.org.uk | http://carfax.org.uk/ | PGP: E2AB1DE4 |
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