Rescan drive

Let's say I expanded drive sdb from 100 to 200GB

lsblk | grep sdb
# sdb      8:16   0   100G  0 disk
echo 1 | sudo tee /sys/class/block/sdb/device/rescan
lsblk | grep sdb
# sdb      8:16   0   200G  0 disk
df -h
sudo resize2fs /dev/sdb
df -h

Or with util

sudo apt-get install scsitools
sudo rescan-scsi-bus

• https://askubuntu.com/questions/639562/how-do-i-rescan-drives-ive-expanded