What is the largest amount of data do you store in MySQL ?

My previous poll got a great response so I thought I should continue these series.
The question of the day today is How much data do your store in your largest MySQL instance ? I’m interested about single instance not the total amount of data you have in MySQL in your Sharded replicated environment. Feel free to share details in comments – are you using MyISAM or Innodb ? Is it working out well for you or are there any challenges you’re seeing ?

[poll id=”3″]

Thank you for your participation !