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iotop

iotop is a Linux command similar to top but instead of CPU and memory it will display and monitor your disk IO usage.

To install, run the following command based on your Linux ditro.

yum install iotop
apt install iotop
dnf install iotop

To use.

iotop
iotop -o

Output:

EFS IO Issue

If the EFS mount is unresponsive, try using this … 

/bin/ls -1f

This is an issue with having too many small files in a directory. This can be fixed by sharding files to multiple sub-directories.