Hi Mario,
Seat_vg-seat or /storage/seat is the one of the database partition which is used to store task and events of vCenter.
You can clear the space of /storage/seat partition by truncating large table from below commands.
VCDB=# truncate table vpx_event cascade;
VCDB=# truncate table vpx_event_arg cascade;
truncate table vpx_task;
Running above command does not require downtime on vCenter.
For more information please refer below link.
VMware Knowledge Base
Regards,
Sachin
