Mysql generate big IO
Mysql begin generate big IO. What reason of this may be?

History:
One of website write even request for site and store session in table (nothig delete it's web site of before programmer).
In table store 3 million rows. I try Delete but then cancel. Table crashed. I repair and try delete then. It's ok.
But know i have big IO. My server in cloud and know i pay cost x3.
Mysql generate big IO
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Mysql begin generate big IO. What reason of this may be?

History:
One of website write even request for site and store session in table (nothig delete it's web site of before programmer).
In table store 3 million rows. I try Delete but then cancel. Table crashed. I repair and try delete then. It's ok.
But know i have big IO. My server in cloud and know i pay cost x3.