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public:btrfs_snapshot_size [2016/04/01 01:41] fangfufu |
public:btrfs_snapshot_size [2018/03/31 01:38] (current) |
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| + | ====== BTRFS snapshot size ====== | ||
| + | * First you need to enable quota | ||
| + | <code bash> | ||
| + | sudo btrfs quota enable /home | ||
| + | </code> | ||
| + | * You need to wait for BTRFS so scan the filesystem for quota usage, then | ||
| + | <code bash> | ||
| + | sudo btrfs qgroup show /home | ||
| + | </code> | ||
| + | * You get output which looks like this: | ||
| + | <code> | ||
| + | qgroupid rfer excl | ||
| + | -------- ---- ---- | ||
| + | 0/5 142.21GiB 89.70MiB | ||
| + | 0/410 96.00KiB 96.00KiB | ||
| + | 0/2191 17.62GiB 0.00B | ||
| + | 0/3237 137.90GiB 4.05GiB | ||
| + | </code> | ||
| + | ''qgroupid'' is the snapshot ID, ''rfer'' is the total size of that snapshot (the size of the parent subvolumes are included), ''excl'' is the exclusive space that particular snapshot occupies. | ||
| + | ===== Deleting snapshots ===== | ||
| + | |||
| + | |||
| + | * You can list all the subvolume by running this: | ||
| + | <code bash> | ||
| + | sudo btrfs subvolume list /home | ||
| + | </code> | ||
| + | Note that this will display the link between the ''BTRFS_SNAPSHOT_ID'' and ''SNAPPER_SNAPSHOT_ID''. | ||
| + | |||
| + | * Note that if you are using snapper, you should delete snapshots using: | ||
| + | <code bash> | ||
| + | snapper -c home delete $SNAPPER_ID | ||
| + | </code> | ||
| + | You shouldn't delete the snapshot using ''btrfs subvolume delete'', as this will confuse Snapper. | ||
| + | |||
| + | ===== Re-initialise qgroups ===== | ||
| + | If your filesystem has just suffered an episode of catastrophic failure, you might need to re-initialise things. A Snapper rollback can cause it. | ||
| + | <code bash> | ||
| + | for i in $(btrfs qgroup show /home | tail -n+3 | cut -d ' ' -f 1); do btrfs qgroup destroy $i /home; done | ||
| + | btrfs quota disable /home | ||
| + | btrfs quota enable /home | ||
| + | </code> | ||