# List partitions on BLKDEV, such as `/dev/sda`.
fdisk -l [BLKDEV]

# Usage:
#   fdisk [options] <disk>    change partition table
#   fdisk [options] -l <disk> list partition table(s)
#   fdisk -s <partition>      give partition size(s) in blocks

# Options:
#   -b <size>             sector size (512, 1024, 2048 or 4096)
#   -c[=<mode>]           compatible mode: 'dos' or 'nondos' (default)
#   -h                    print this help text
#   -u[=<unit>]           display units: 'cylinders' or 'sectors' (default)
#   -v                    print program version
#   -C <number>           specify the number of cylinders
#   -H <number>           specify the number of heads
#   -S <number>           specify the number of sectors per track

# To display partition table
p

# To delete a partition
d

# To display a list of partition types
l or L

# To create a new partition
n

# To change the type of a partition
t

# To write changes to fdisk
w

# Adding a new physical disk
lsblk
fdisk /dev/sdd

# create new partition in fdisk
mkfs.xfs /dev/sdd1
blkid /dev/sdd1

# edit /etc/fstab
UUID=<blkid#> /opt defaults 0 0 # 00 disable disk checking and metadata dumping
mount -a
df -h /opt

# Extending a physical disk (vm). Step 3 prints partitions on `/dev/sdc`. Step
# 4 deletes the old partition, then creates a new one.
1. Unmount drive. Comment out `/etc/fstab` entry for `/dev/sdc`.
2. Increase drive physical space
3. parted /dev/sdc - 'p'
4. fdisk /dev/sdc - 'p' - 'd' - 'n' (defaults) - w
5. reboot
6. e2fsck -f /dev/sdc1
7. resize2fs /dev/sdc1
8. mount /dev/sdc1 - uncomment fstab