I performed a maintenance update a few days ago and since then the disk usage grew considerable due to mysql temp files not being deleted.
Example from this morning:
-rw-rw---- 1 mysql mysql 3275751424 Oct 15 06:58 #sql-ib10877-701271144.ibd
Given the size this is related to
-rw-rw---- 1 mysql mysql 4366270464 Oct 15 09:44 live_positions.ibd
Given the time at which this happens, it seems related to the daily database optimisation, dump and backup.
This occurs only since the update a few days ago (on debian 64b).
Installed packages are:
i A libperconaserverclient18.1 - Percona Server database client library
i percona-server-client-5.6 - Percona Server database client binaries
i percona-server-common-5.6 - Percona Server database common files (e.g.
i percona-server-server-5.6 - Percona Server database server binaries
All packages up to date on 14 Oct 2014