How to Extend the partition after extending it from VMware / SAN

Issue

• CentOS 6/7, RHEL6/7 with XFS file system
• My / Filesystem is full
• I have extended the size from VMware datastore or SAN LUN

Note

• Reboot is necessary (6/7) if it is an OS parition ie /.
• Makesure you have a backup / snapshot of the `sda` disk

Solution

In this example, we are assuming that the disk is /dev/sda and the partition is /dev/sda3 mounted on /.

• Rescan the disk after extending the disk from VMware or SAN.

   echo 1 > /sys/block/sda/device/rescan

• Now fisk -l /dev/sda will show the disks new size.
• Now we have to extend the partition, for that run fdisk on the disk and re-create the parition.

  fdisk /dev/sda

• Press p to print the partion table, and note your partion id for / (In our case its 3)
• press d to delete the partition
• Enter the number 3 and your partion is deleted.
• Now press c to create a new partion and select 3 again, then just presss ENTER and ENTER when it as for starting and ending cylindar number.
• Press p again to see the parion list and press w to write the partition table.
• Now reboot your system
• After rebooting, run xfsgrow /
• Now run df -h and your partion will be extended.

Please Comment and share if found helpful 🙂