I am new to btrfs, being introduced under openSuse 3.2 as the root file
system. In the past I always made backups of my disks using rsync. I now
have two versions of the OS on the same system. I was trying to mount
the second btrfs system as well as the first. I edited my /etc/fstab
(attached) to add a similar set of mounts as the existing system. Man
mount said I needed to use the subvolume ID rather than paths. So I
mounted the root of the dest file system at /usr11, and then executed:
btrfs subvolume list -u /usr11
to obtain the UUID for each subvolume. After some time in emacs I edited
my fstab to include IDs. It appeared successful as the output of df -a
which follows demonstrates:
/dev/sdc2 btrfs 21G 5.9G 14G 30% /
/dev/sdc2 btrfs 21G 5.9G 14G 30% /var/tmp
/dev/sdc2 btrfs 21G 5.9G 14G 30% /var/spool
/dev/sdc3 xfs 910G 109G 801G 12% /home
/dev/sdc2 btrfs 21G 5.9G 14G 30% /var/lib/pgsql
/dev/sdc2 btrfs 21G 5.9G 14G 30% /var/opt
/dev/sdc2 btrfs 21G 5.9G 14G 30% /var/log
/dev/sdc2 btrfs 21G 5.9G 14G 30% /var/lib/named
/dev/sdc2 btrfs 21G 5.9G 14G 30% /var/lib/mailman
/dev/sdc2 btrfs 21G 5.9G 14G 30% /tmp
/dev/sdc2 btrfs 21G 5.9G 14G 30% /srv
/dev/sdc2 btrfs 21G 5.9G 14G 30% /opt
/dev/sdc2 btrfs 21G 5.9G 14G 30% /boot/grub2/x86_64-efi
/dev/sdc2 btrfs 21G 5.9G 14G 30% /var/crash
/dev/sdc2 btrfs 21G 5.9G 14G 30% /usr/local
/dev/sdc2 btrfs 21G 5.9G 14G 30% /boot/grub2/i386-pc
/dev/sdb2 btrfs 21G 9.1G 11G 47% /usr11
/dev/sdb2 btrfs 21G 9.1G 11G 47% /usr11/var/tmp
/dev/sdb2 btrfs 21G 9.1G 11G 47% /usr11/var/spool
/dev/sdb2 btrfs 21G 9.1G 11G 47% /usr11/var/opt
/dev/sdb2 btrfs 21G 9.1G 11G 47% /usr11/var/log
/dev/sdb2 btrfs 21G 9.1G 11G 47% /usr11/var/lib/pgsql
/dev/sdb2 btrfs 21G 9.1G 11G 47% /usr11/var/lib/named
/dev/sdb2 btrfs 21G 9.1G 11G 47% /usr11/var/lib/mailman
/dev/sdb2 btrfs 21G 9.1G 11G 47% /usr11/var/crash
/dev/sdb2 btrfs 21G 9.1G 11G 47% /usr11/usr/local
/dev/sdb2 btrfs 21G 9.1G 11G 47% /usr11/tmp
/dev/sdb2 btrfs 21G 9.1G 11G 47% /usr11/srv
/dev/sdb2 btrfs 21G 9.1G 11G 47% /usr11/opt
/dev/sdb2 btrfs 21G 9.1G 11G 47% /usr11/boot/grub2/x86_64-efi
/dev/sdb2 btrfs 21G 9.1G 11G 47% /usr11/boot/grub2/i386-pc
I was happy until I tried to perform an ls on /usr11/tmp and found that
it contained the root file system, all the /usr11 files present. My plan
had been to rsync these two systems, from / to /usr11. If I umount
/usr1/tmp subvolume and ls on /usr1/tmp, I obtain the expected results.
Why when I mount the subvolume do I see all of the root files? I have
attached my fstab for reference. I hope this is an easy one.
Thanks,
Don
UUID=094b906f-2cbe-4241-8adc-0938266023ad swap swap defaults 0 0
UUID=5232a076-1062-4b49-a1c3-484a9e785bae / btrfs defaults 0 0
UUID=5232a076-1062-4b49-a1c3-484a9e785bae /boot/grub2/i386-pc btrfs subvol=boot/grub2/i386-pc 0 0
UUID=5232a076-1062-4b49-a1c3-484a9e785bae /boot/grub2/x86_64-efi btrfs subvol=boot/grub2/x86_64-efi 0 0
UUID=5232a076-1062-4b49-a1c3-484a9e785bae /opt btrfs subvol=opt 0 0
UUID=5232a076-1062-4b49-a1c3-484a9e785bae /srv btrfs subvol=srv 0 0
UUID=5232a076-1062-4b49-a1c3-484a9e785bae /tmp btrfs subvol=tmp 0 0
UUID=5232a076-1062-4b49-a1c3-484a9e785bae /usr/local btrfs subvol=usr/local 0 0
UUID=5232a076-1062-4b49-a1c3-484a9e785bae /var/crash btrfs subvol=var/crash 0 0
UUID=5232a076-1062-4b49-a1c3-484a9e785bae /var/lib/mailman btrfs subvol=var/lib/mailman 0 0
UUID=5232a076-1062-4b49-a1c3-484a9e785bae /var/lib/named btrfs subvol=var/lib/named 0 0
UUID=5232a076-1062-4b49-a1c3-484a9e785bae /var/lib/pgsql btrfs subvol=var/lib/pgsql 0 0
UUID=5232a076-1062-4b49-a1c3-484a9e785bae /var/log btrfs subvol=var/log 0 0
UUID=5232a076-1062-4b49-a1c3-484a9e785bae /var/opt btrfs subvol=var/opt 0 0
UUID=5232a076-1062-4b49-a1c3-484a9e785bae /var/spool btrfs subvol=var/spool 0 0
UUID=5232a076-1062-4b49-a1c3-484a9e785bae /var/tmp btrfs subvol=var/tmp 0 0
UUID=ce7d48a9-c3f6-4a23-8004-5208b8276f85 /home xfs defaults 1 2
# UUID for subvolumes came from btrfs subvolume list -u /usr11 use df -a
#UUID=0af968c4-fbb5-4cde-b5b8-181763170a34 swap swap defaults 0 0
UUID=26d63d99-92f4-4a49-878b-236f5e88af69 /usr11 btrfs defaults 0 0
UUID=26d63d99-92f4-4a49-878b-236f5e88af69 /usr11/boot/grub2/i386-pc btrfs subvolid=UUID=b62cffe5-32dc-a44f-9117-ed1558feac83 0 0
UUID=26d63d99-92f4-4a49-878b-236f5e88af69 /usr11/boot/grub2/x86_64-efi btrfs subvolid=UUID=df44b847-81ae-a447-9cb1-2e015262125f 0 0
UUID=26d63d99-92f4-4a49-878b-236f5e88af69 /usr11/opt btrfs subvolid=UUID=3c46ec67-442b-a546-8396-0e34ce2cd493 0 0
UUID=26d63d99-92f4-4a49-878b-236f5e88af69 /usr11/srv btrfs subvolid=UUID=dc710aed-4731-ba4f-acc0-8f43e710228a 0 0
UUID=26d63d99-92f4-4a49-878b-236f5e88af69 /usr11/tmp btrfs subvolid=UUID=d3080a7a-b74c-b145-a5dc-fcf80aebda8d 0 0
UUID=26d63d99-92f4-4a49-878b-236f5e88af69 /usr11/usr/local btrfs subvolid=UUID=cab6bc25-db7c-5046-8285-7fb4e17886c9 0 0
UUID=26d63d99-92f4-4a49-878b-236f5e88af69 /usr11/var/crash btrfs subvolid=UUID=850146e1-8cc8-d84a-8895-26e4bdbf6d63 0 0
UUID=26d63d99-92f4-4a49-878b-236f5e88af69 /usr11/var/lib/mailman btrfs subvolid=UUID=44e4e9f1-030d-c846-83cb-4897bfb3c77f 0 0
UUID=26d63d99-92f4-4a49-878b-236f5e88af69 /usr11/var/lib/named btrfs subvolid=UUID=818ed2e9-24f8-3d45-bc75-f356a37167fe 0 0
UUID=26d63d99-92f4-4a49-878b-236f5e88af69 /usr11/var/lib/pgsql btrfs subvolid=UUID=f25de053-f268-1141-9131-605fde0b9d0d 0 0
UUID=26d63d99-92f4-4a49-878b-236f5e88af69 /usr11/var/log btrfs subvolid=UUID=33910c4a-88f5-4644-a67a-7e21f3b1ef67 0 0
UUID=26d63d99-92f4-4a49-878b-236f5e88af69 /usr11/var/opt btrfs subvolid=UUID=9d2dacbd-88ae-b249-a2c6-c6545d107a68 0 0
UUID=26d63d99-92f4-4a49-878b-236f5e88af69 /usr11/var/spool btrfs subvolid=UUID=5c996dfd-bc3a-314a-a69e-a43f53bde948 0 0
UUID=26d63d99-92f4-4a49-878b-236f5e88af69 /usr11/var/tmp btrfs subvolid=UUID=21190cdf-9736-ea4b-abf0-d5e93911891b 0 0
#UUID=7f2bc28a-1c69-49fb-b4a8-d4eec79d2fa5 /home xfs defaults 1 2
#UUID=26d63d99-92f4-4a49-878b-236f5e88af69 /.snapshots btrfs s ubvol=.snapshots 0 0
#/dev/sr0 /cdrom auto users,exec,dev,suid,rw,async,noauto 0 0
#/dev/sdd1 /usr11 auto users,exec,dev,suid,rw,async,noauto 0 0
