Clear all Snapper snapshots

The command in recent versions of snapper is (I don't remember when it was introduced, but the version in e.g., openSUSE 13.2 supports this):

snapper delete number1-number2

So to delete all snapshots (assuming you have no more than 100000 of them) you'd do:

snapper delete 1-100000

Obviously this only deletes snapshots on the default root config, so for a different config it would be:

snapper -c configname delete number1-number2

You can use a for loop to delete all snapshots within a range (run as root).

# for i in `seq 1 999`; do snapper delete $i; done

This will hit some invalid entries (when the number doesn't correspond to a snapshot ID), which will result in a harmless error log.

To determine the range (lower and upper limit) of snapshot IDs, so that the loop won't run unnecessarily long, use:

snapper list

I found this solution along with a discussion about how to reduce the snapper interval and retention settings.