On Tue, Jun 15, 2021 at 07:45:59AM +0200, Ralf Groß wrote: > Hi, > > is there any way to copy or move data between 2 xfs fs with reflinks > on the same host, so that the data is not rehydrated (I guess cp > --reflink will not be working)? If this is not possible, would it be > able to clone the existing fs to a new one and then continue to use > both? > > Background: I've backup data on a 350 TB reflink xfs fs, now a second > fs will be added to the server and parts of existing data should be > moved to it. If it's possible to clone the whole fs I could delete > parts of it afterwards, but copying/moving single directories would be > easier. Reflinking (aka data block sharing) can only be performed between files within a single filesystem. You could use xfs_copy to clone the fs which would be faster than dd, though not as fast as targeted copying of parts of the directory tree as needed. --D > > Ralf
