How to extend XFS LVM in Red Hat

How to extend a logical volume (LVM) on Red Hat Linux with XFS filesystem

Scenario – Customer requires a 1TB LUN adding to a Production Linux Database server and the /data partition extending by 1TB. A Server is a Virtual Machine on VMware. The filesystem is XFS.

Actions

This is a very common task performed by Linux system administrators, but to others, this may seem a daunting task. The process may seem difficult but it’s not when you get your head around how Red Hat manages the filesystem and Logical Volumes (LVM)

  • Take a snapshot of the VM to create a rollback point
  • Log in to vCenter and locate the Virtual Machine. (preferably use the VMware Web Client)
  • Right Click on the VM and select Edit Settings
  • Add a new Hard Disk, set the size to 1TB, and type to your preference (My policy is to use Thick provision lazy zero)

  • SSH to the VM or connect via the VMware Console.
  • For ease of use, I will sudo -su to root : type sudo su
  • Type pvs to list the disks attached to the server

  • Find the 1TB LUN you just added. it will usually be the last one on the list. make a note of the mount point (eg. /dev/sdd)
  • Next work out how many volume groups you have: Type vgs

  • Now, for my example, I will be using physical volume /dev/sdd and Volume Group VG01 as that is where /data resides
  • type fdisk /dev/sdd   (Amend to your physical volume if needed)
  • This will open fdisk – note any changes you make here will not be committed to disk until you type W for write!
  • press n to create a new disk partition,
  • press p to create a primary disk partition,
  • press 1 to denote it as 1st disk partition,
  • Press ENTER twice to accept the default of 1st and last cylinder – to convert the whole secondary hard disk to a single disk partition,
  • press t (will automatically select the only partition – partition 1) to change the default Linux partition type (0x83) to LVM partition type (0x8e),
  • press L to list all the currently supported partition type,
  • press 8e (as per the L listing) to change partition 1 to 8e, i.e. Linux LVM partition type,
  • press p to display the secondary hard disk partition setup. Please take note that the first partition is denoted as /dev/hdb1 in Linux,
  • press w to write the partition table and exit fdisk upon completion.
  • type partprobe to query service partitions
  • now to extend the volume group – type vgextend vg01 /dev/sdd1   (ensure you check your vg and sdd values)
  • now to extend the logical volume – type lvextend +1T /dev/vg01/data /dev/sdd1  (ensure you check your vg and sdd values)
  • if you get an error its possible the disk might not quite have 1TB, which is 1024gb – try  lvextend -L +1000G /dev/vg01/data /dev/sdd1
  • now to grow the filesystem – type xfs_growfs /data
  • That’s it – all done, you can confirm by typing df -h
  • Remember to delete the snapshot so your datastore does not fill up.

Elsewhere On TurboGeek:  Linux Disk Space Usage Commands

Richard.Bailey

Richard Bailey, a seasoned tech enthusiast, combines a passion for innovation with a knack for simplifying complex concepts. With over a decade in the industry, he's pioneered transformative solutions, blending creativity with technical prowess. An avid writer, Richard's articles resonate with readers, offering insightful perspectives that bridge the gap between technology and everyday life. His commitment to excellence and tireless pursuit of knowledge continues to inspire and shape the tech landscape.

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