updated notes

src/rhcsa.md

@@ -155,6 +155,7 @@ sudo mount -a # Mount all partitions
 sudo fdisk /dev/sda # Partition the disk /dev/sda
 # Note: p for print, n for new partition, w for write, t for type, 8e for LVM
 
+### Physical Volumes ###
 sudo pvdisplay # Display all physical volumes
 sudo pvs # Display all physical volumes
 
@@ -162,21 +163,25 @@ sudo pvcreate /dev/sda1p1 # Create a physical volume on /dev/sda1p1
 sudo pvcreate /dev/sdb1p1 # Create a physical volume on /dev/sdb1p1
 sudo pvcreate /dev/sdc1p1 # Create a physical volume on /dev/sdc1p1
 
+### Volume Groups ###
 sudo vgcreate vg_data /dev/sda1p1 /dev/sdb1p1 /dev/sdc1p1 # Create a volume group vg_data on /dev/sda1p1, /dev/sdb1p1, /dev/sdc1p1
 
 sudo vgdisplay # Display all volume groups
 sudo vgs # Display all volume groups
 
+### Logical Volumes ###
 sudo lvdisplay # Display all logical volumes
 sudo lvs # Display all logical volumes
 
 sudo lvcreate -n lv_data -l 100%FREE vg_data # Create a logical volume lv_data on vg_data
 sudo lvcreate -n lv_data -L 100M vg_data # Create a logical volume lv_data on vg_data with a size of 100M
 
+### Formatting and Mounting ###
 sudo mkfs.xfs /dev/vg_data/lv_data # Format the logical volume lv_data as XFS
 sudo mount /dev/vg_data/lv_data /mnt # Mount the logical volume lv_data to /mnt
 sudo umount /mnt # Unmount the logical volume lv_data from /mnt
 
+### Extending and Reducing ###
 sudo lvextend -L +100M /dev/vg_data/lv_data # Extend the logical volume lv_data by 100M
 sudo lvreduce -L -100M /dev/vg_data/lv_data # Reduce the logical volume lv_data by 100M
 
@@ -184,6 +189,7 @@ sudo lvremove /dev/vg_data/lv_data # Remove the logical volume lv_data
 sudo vgremove vg_data # Remove the volume group vg_data
 sudo pvremove /dev/sda1p1 /dev/sdb1p1 /dev/sdc1p1 # Remove the physical volumes /dev/sda1p1, /dev/sdb1p1, /dev/sdc1p1
 
+### Interactive LVM Tool ###
 sudo lvm # Interactive LVM tool
 ```