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I have an Ubuntu 14.04 server with btrfs (SSD drive) as /, and I have a bind of another drive (SATA) to /home. The SSD drive has reported that is out of free space, so I read this, applied some of the suggestions, and removed some files. This is what btrfs now reports:

# btrfs fi show /
Label: system  uuid: 2322b989-2110-494b-96b0-40aaee2f3998
    Total devices 1 FS bytes used 6.20GiB
    devid    1 size 26.08GiB used 22.52GiB path /dev/sdc1

# btrfs fi df /
Data, single: total=21.76GiB, used=5.69GiB
System, single: total=4.00MiB, used=16.00KiB
Metadata, single: total=776.00MiB, used=522.03MiB

# btrfs subvolume list /

ID 257 gen 2090434 top level 5 path @
ID 258 gen 1048023 top level 5 path @home

df -h
/dev/sdc1        27G  6.3G   20G  25% /

It is safe to remove @home as it is actually a bind to another drive? But before that, I just want to be sure I'm reading the above numbers correctly... The drive is using around 6GB out of 26G, right?

UPDATE

This is my fstab (relevant parts):

UUID=2322b989-2110-494b-96b0-40aaee2f3998   /   btrfs   noatime,nodiratime,notreelog,ssd,discard,subvol=@   0   1

UUID=858a4a9d-a901-47c7-89d2-0ef97ef6f23f   /mnt/ext ext4  defaults,acl,user_xattr,noatime,nodiratime 0  1

/mnt/ext/home /home   none bind
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lepe
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1 Answers1

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It looks like you can safely remove the @home subvolume. It is not mounted anywhere on boot.

I recommend to check if there is anything important there left. You can unmount the HDD for that and see what is in /home.

Pilot6
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  • Thanks Pilot6, I will do that this weekend (as the server is running through the week). The correct way to remove it would be: btrfs subvolume delete /@home, right? One more thing: is my assumption that the drive is using around 6GB correct? – lepe Jun 14 '16 at 00:39
  • Yes, all is corect. – Pilot6 Jun 14 '16 at 05:06