How to know if it is safe to remove block storage

September 18, 2017 197 views
Block Storage Docker Ubuntu 16.04

I have a block storage volume-nyc1-01 of 1TB attached to the droplet and we would like to remove it.

The volume has not been mounted yet (no entry in fstab or mtab) so I guess I can simply delete it from dashboard.

But df -h shows that size of docker volumes are more than 60GB (which is systems SSD).

root@ubuntu-4gb-nyc1-01:~# df -h
Filesystem Size Used Avail Use% Mounted on
udev 2.0G 0 2.0G 0% /dev
tmpfs 396M 41M 355M 11% /run
/dev/vda1 59G 12G 47G 21% /
tmpfs 2.0G 0 2.0G 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 2.0G 0 2.0G 0% /sys/fs/cgroup
/dev/dm-1 100G 617M 100G 1% /var/lib/docker/devicemapper/mnt/37bcacd5592623173bb4887cfc87c74d57efab37acaa25506f18a6083c742c10
shm 64M 0 64M 0% /var/lib/docker/containers/37bcacd5592623173bb4887cfc87c74d57efab37acaa25506f18a6083c742c10/shm
--- truncated --
tmpfs 396M 0 396M 0% /run/user/0

I would like to know from where these space come from and if its safe to remove the block storage ?

Any help is appreciated.

3 comments
  • @syedhabeeb

    Check the output of mount if it is not mounted then you can safely remove it, but I have no idea about the disk space used by docker.

  • @Mohsen47 thanks, volume is not in mount -l too,
    disk space used by docker is what pulls me back from removing it.

  • lsblk says this, if it helps

    root@ubuntu-4gb-nyc1-01:~# lsblk
    NAME                                                                                     MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
    sda                                                                                        8:0    0 1000G  0 disk 
    vda                                                                                      253:0    0   60G  0 disk 
    └─vda1                                                                                   253:1    0   60G  0 part /
    loop0                                                                                      7:0    0  100G  0 loop 
    └─docker-253:1-516365-pool                                                               252:0    0  100G  0 dm   
      ├─docker-253:1-516365-37bcacd5592623173bb4887cfc87c74d57efab37acaa25506f18a6083c742c10 252:1    0  100G  0 dm   /var/lib/docker/devicemapper/mnt/37bcacd5592623173bb4887cfc87c74d57efab37acaa25506f18a6083c742c10
      ├─docker-253:1-516365-68daacf086ac074f8f0a21465c05d966ff22735fdf02120b380ac993d280683a 252:2    0  100G  0 dm   /var/lib/docker/devicemapper/mnt/68daacf086ac074f8f0a21465c05d966ff22735fdf02120b380ac993d280683a
      ├─docker-253:1-516365-6b2d1832f9ed653b8a1e67687ac54a19297c32a94a909f7c6d94fe9953194332 252:3    0  100G  0 dm   /var/lib/docker/devicemapper/mnt/6b2d1832f9ed653b8a1e67687ac54a19297c32a94a909f7c6d94fe9953194332
      ├─docker-253:1-516365-773d6a80c02ebb3b9303c919d792b07bccb62987d7d27a3f410e4a5ada306b2c 252:4    0  100G  0 dm   /var/lib/docker/devicemapper/mnt/773d6a80c02ebb3b9303c919d792b07bccb62987d7d27a3f410e4a5ada306b2c
      ├─docker-253:1-516365-949660ab1452d9a69fd363106445acb6f3fc81185145cad5091adccf7f3bfdc8 252:5    0  100G  0 dm   /var/lib/docker/devicemapper/mnt/949660ab1452d9a69fd363106445acb6f3fc81185145cad5091adccf7f3bfdc8
      ├─docker-253:1-516365-87182cb88b7650a94758c9b305ca9963a1f17de9065e217fcc0ead75d18bf634 252:6    0  100G  0 dm   /var/lib/docker/devicemapper/mnt/87182cb88b7650a94758c9b305ca9963a1f17de9065e217fcc0ead75d18bf634
      ├─docker-253:1-516365-5c420a5927b8e208aa1fdf17b7e305c6b2202bec1fe702d297f7dfd869934f10 252:7    0  100G  0 dm   /var/lib/docker/devicemapper/mnt/5c420a5927b8e208aa1fdf17b7e305c6b2202bec1fe702d297f7dfd869934f10
      ├─docker-253:1-516365-b79b1e1cad9026efd6357feeb79d84ffda9f53ebe50ce49cf59f3679ac19529d 252:8    0  100G  0 dm   /var/lib/docker/devicemapper/mnt/b79b1e1cad9026efd6357feeb79d84ffda9f53ebe50ce49cf59f3679ac19529d
      └─docker-253:1-516365-64e5c49b00db3f99b582325b736d1cb657cf8dac2892368a2bd58e4d05e7a860 252:9    0  100G  0 dm   /var/lib/docker/devicemapper/mnt/64e5c49b00db3f99b582325b736d1cb657cf8dac2892368a2bd58e4d05e7a860
    loop1                                                                                      7:1    0    2G  0 loop 
    └─docker-253:1-516365-pool                                                               252:0    0  100G  0 dm   
      ├─docker-253:1-516365-37bcacd5592623173bb4887cfc87c74d57efab37acaa25506f18a6083c742c10 252:1    0  100G  0 dm   /var/lib/docker/devicemapper/mnt/37bcacd5592623173bb4887cfc87c74d57efab37acaa25506f18a6083c742c10
      ├─docker-253:1-516365-68daacf086ac074f8f0a21465c05d966ff22735fdf02120b380ac993d280683a 252:2    0  100G  0 dm   /var/lib/docker/devicemapper/mnt/68daacf086ac074f8f0a21465c05d966ff22735fdf02120b380ac993d280683a
      ├─docker-253:1-516365-6b2d1832f9ed653b8a1e67687ac54a19297c32a94a909f7c6d94fe9953194332 252:3    0  100G  0 dm   /var/lib/docker/devicemapper/mnt/6b2d1832f9ed653b8a1e67687ac54a19297c32a94a909f7c6d94fe9953194332
      ├─docker-253:1-516365-773d6a80c02ebb3b9303c919d792b07bccb62987d7d27a3f410e4a5ada306b2c 252:4    0  100G  0 dm   /var/lib/docker/devicemapper/mnt/773d6a80c02ebb3b9303c919d792b07bccb62987d7d27a3f410e4a5ada306b2c
      ├─docker-253:1-516365-949660ab1452d9a69fd363106445acb6f3fc81185145cad5091adccf7f3bfdc8 252:5    0  100G  0 dm   /var/lib/docker/devicemapper/mnt/949660ab1452d9a69fd363106445acb6f3fc81185145cad5091adccf7f3bfdc8
      ├─docker-253:1-516365-87182cb88b7650a94758c9b305ca9963a1f17de9065e217fcc0ead75d18bf634 252:6    0  100G  0 dm   /var/lib/docker/devicemapper/mnt/87182cb88b7650a94758c9b305ca9963a1f17de9065e217fcc0ead75d18bf634
      ├─docker-253:1-516365-5c420a5927b8e208aa1fdf17b7e305c6b2202bec1fe702d297f7dfd869934f10 252:7    0  100G  0 dm   /var/lib/docker/devicemapper/mnt/5c420a5927b8e208aa1fdf17b7e305c6b2202bec1fe702d297f7dfd869934f10
      ├─docker-253:1-516365-b79b1e1cad9026efd6357feeb79d84ffda9f53ebe50ce49cf59f3679ac19529d 252:8    0  100G  0 dm   /var/lib/docker/devicemapper/mnt/b79b1e1cad9026efd6357feeb79d84ffda9f53ebe50ce49cf59f3679ac19529d
      └─docker-253:1-516365-64e5c49b00db3f99b582325b736d1cb657cf8dac2892368a2bd58e4d05e7a860 252:9    0  100G  0 dm   /var/lib/docker/devicemapper/mnt/64e5c49b00db3f99b582325b736d1cb657cf8dac2892368a2bd58e4d05e7a860
    
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