Sometimes DoS attacks, spam attacks, poorly designed PHP scripts consume large amounts of memory and this makes the sense of high I/O usage inside your Cpanel. Once you scan you will find the result which plugin is creating this issue so clean it one by one or rather I will suggest you to stop using that plugin or theme. You can take backup of your plugins and theme folder separately and scan them at Virus Total website. If your WordPress site is affected by Malware then be sure to clean it else hacker will try to slow down your website by increasing the load of your website.
HOW TO INSTALL VIRUS TOTAL WITH PLESK ZIP FILE
If you are the owner of a VPS or Dedicated server and while creating a ZIP file from the files of 20 and each file is having 10 GB then it will take a lot of time and hence increase in I/O usage. Mainly the I/O is caused due to the increase in Data output and input or you can say increased in reading speed and writing speed in the disc. I/O processes to an HDD are particularly slow when compared with solid-state memory such as RAM, HDD I/O is, on average, 2,000 times slower. On a server, a disk I/O describes every process that involves writing to or reading from a storage device which on a shared web hosting server will be the hard disk drive or HDD. I/O (input/output is measured in KB/s) is just the “throughput” or speed of data transfer between the hard disk and the RAM.
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How to: Fix I/O usage running high on cPanel