The mysql-bin.xxxx files are growing very fast
Are you using replication?  If not, do you have the binlogs turned on for backups?

Do you have expire_logs_days set?  To what?

Give us some clues of what write queries are going on.

Are you UPDATEing all the rows in large tables?  If so, this is a sign of a mis-designed schema.

Are you doing massive DELETEs?  Let's discuss alternatives.