Extend a linux file system after resizing a volume
Your EBS volume might have a partition that contains the file system and data. Increasing the size of a volume does not increase the size of the partition.
Before you extend the file system on a resized volume, check whether the volume has a partition that must be extended to the new size of the volume.
use the lsblk command
Use a file system-specific command to resize each file system to the new volume capacity.
https://8gwifi.org