10:26:49 == D's cost on the same database: mariadb-dump while running
dump 0.44s  1062572 B
== F on the same database: stop, copy, start
stop 1.58s
cp -a 185 MB: 0.81s
tar 185 MB: 0.53s
start 0.63s
== a 2 GiB synthetic volume (random bytes, not app data) for the extrapolation
page cache could NOT be dropped (LXC) - warm-ish numbers
cp -a 2 GiB: 4.87s
tar 2 GiB: 4.55s
/dev/loop1       69G   48G   18G  74% /var/lib/docker

