> On 5 Sep 2019, at 1:55 AM, Chris Murphy <lists@xxxxxxxxxxxxxxxxx> wrote: > > On Wed, Sep 4, 2019 at 12:16 AM Swâmi Petaramesh <swami@xxxxxxxxxxxxxx> wrote: >> >> Hi list, >> >> Is there an advised way to completely “clone” a complete BTRFS >> filesystem, I mean to get an exact copy of a BTRFS filesystem including >> subvolumes (even readonly snapshots) and complete file attributes >> including extended attributes, ACLs and so, to another storage pool, >> possibly defined with a different RAID geometry or compression ? > Remote replication is a planned feature, when ready, it can be used with a local target to meet this requisite. > The bottom line answer is no. There are only compromises. > > Btrfs seed sprout will do what you want, except you can't change > geometry or compression. Last time I tested multiple devices as either > a source or destination, I ran into problems - but it's possible some > of this has been fixed, which is a question for Anand Jain. Thanks for the report. I just tested the below test case[1], it does not fail. Any idea? [1] Create and mount a two devices seed fs, and create a sprout. umount /btrfs; mkfs.btrfs -fq -dsingle -msingle /dev/sdb /dev/sdc && mount /dev/sdb /btrfs && fillfs /btrfs 100 && umount /btrfs && btrfstune -S1 /dev/sdb && mount /dev/sdb /btrfs && btrfs dev add /dev/sdd /btrfs && umount /btrfs Mount the sprout device and delete the seed devices to make it an independent but identical fs. mount /dev/sdd /btrfs && btrfs dev del /dev/sdb /btrfs && btrfs dev del /dev/sdc /btrfs Thanks, Anand
