Add additional space to ext4 filesystem in RHEL

 To add additional space to an ext4 filesystem on a Red Hat Enterprise Linux (RHEL) system, you can use the following steps:

1. Use the command df -h to check the current usage and available space on the filesystem.
2. Use the command fdisk -l to check the available disk space on the system.
3. If there is free space on the disk, you can use the command fdisk /dev/sda (replacing /dev/sda with the appropriate device name) to create a new partition with the free space.
4. Use the command mkfs.ext4 /dev/sdaX (replacing /dev/sdaX with the appropriate device name) to create a new ext4 filesystem on the new partition.
5. Use the command mount /dev/sdaX /mnt (replacing /dev/sdaX and /mnt with the appropriate device name and mount point) to mount the new filesystem.
6. Use the command df -h again to check the new available space on the filesystem.
7. If you want to mount this filesystem automatically during boot, you should add an entry in the /etc/fstab file.

Please, be aware that this is a dangerous operation, if any mistake happens, it can cause data lost. It's strongly recommended to backup your data before doing this operation.

Resize the Redhat XFS LVM partition

To resize a Redhat XFS LVM partition, you will need to follow these steps:

Backup your data to a safe location. Resizing a partition always carries the risk of data loss, so it is important to have a backup before proceeding.

Check if the partition is mounted. You cannot resize a mounted partition, so you will need to unmount it first. To do this, run the following command:

umount /path/to/partition

Check if the partition is part of an LVM. If it is, you will need to deactivate the volume group (VG) before you can resize the partition. To do this, run the following command:

vgchange -an /dev/vg_name

Use the fdisk command to delete the existing partition and recreate it with the new size. Make sure to specify the correct device name for your partition (e.g. /dev/sda1).

Create a new physical volume (PV) on the resized partition:

pvcreate /dev/sda1

Add the PV to the VG:

vgextend /dev/vg_name /dev/sda1

Use the lvextend command to extend the logical volume (LV) to the desired size:

lvextend -L +size /dev/vg_name/lv_name

Finally, resize the XFS filesystem on the LV to fill the new space:

xfs_growfs /path/to/lv

That's it! You have successfully resized your Redhat XFS LVM partition.