High Disk I/O after batch deleting from innodb table
First and foremost if your data had some sort of identification (ie PRIMARY KEY, or TIMESTAMP) then you could have done: 

DELETE FROM table_name WHERE PRIMARY_KEY_column &lt; PRIMARY_KEY_value;
-- or 
DELETE FROM table_name WHERE TIMESTAMP_column &lt; TIMESTAMP_value;


As for what to do now. I would run the following processes: 


In a WHILE TRUE make sure that the mysql isn't hanging 


mysql -h $HOST -P $port -uroot -e "show processlist;"


Check the row count to see if you are increasing or decreasing 


SELECT COUNT(*) FROM table_name; 


If the row count is increasing then you should check what other processes are being utilized. 
ps fux | grep mysql 


However, if the row count is decreasing or consistent then it may mean that your deletes are not fully finished. 

Wish I can be more help, but your question felt incomplete and thus not very clear.