The block device is now 2TB, but the filesystem still has its old size. You need to resize it, e.g. using resize2fs
- increasing size can be done online.
The steps are these (assuming this is the last partition on the block device):
- First use fdisk or friends to extend the partition,
- then use the resize tool for your file system (
resize2fs
for ext) to resize the file system.
You don't need to stop your processes, if you use a file system, that can grow online (such as ext or ocfs2)