How can I extend my logical volume and the filesystem in the command line? I have extended a logical volume using lvextend which shows the extension in volume group vgdisplay but df isn't reflecting the size, am I missing anything? How do I increase my filesystem on the fly, without unmounting it? We are using LVM for mounting the filesystem, how can we use the lvextend command to extend the volume group and increase the filesystem size?
What are the steps to extend a filesystem after a LUN capacity has been extended? What is the procedure to increase the size of an LVM2 logical volume and resize its filesystem? You can grow a file system to the maximum space available on the device, or specify an exact size. Ensure that you grow the size of the device or logical volume before you attempt to increase the size of the file system. When specifying an exact size for the file system, ensure that the new size satisfies the following conditions:.
The new size must be greater than the size of the existing data; otherwise, data loss occurs. The new size must be equal to or less than the current device size because the file system size cannot extend beyond the space available. When decreasing the size of the file system on a device, ensure that the new size satisfies the following conditions:. If you plan to also decrease the size of the logical volume that holds the file system, ensure that you decrease the size of the file system before you attempt to decrease the size of the device or logical volume.
The size of Ext2, Ext3, and Ext4 file systems can be increased by using the resize2fs command when the file system is mounted. The size of an Ext3 file system can also be increased by using the resize2fs command when the file system is unmounted. Open a terminal console, then log in as the root user or equivalent. If the file system is Ext2 or Ext4, you must unmount the file system.
The Ext3 file system can be mounted or unmounted. Then rescan the scsi bus. On this machine, we have two devices. Execute the following commands to re-scan them. Below you can replace the '' with the actual scsi bus name found with the previous command.
Each colon is prefixed with a slash, which is what makes it look weird. If you've added a new disk on the server, the actions are similar to those described above.
But instead of rescanning an already existing scsi bus like show earlier, you have to rescan the host to detect the new scsi bus as you've added a new disk.
Once the rescan is done should only take a few seconds , you can check if the extra space can be seen on the disk. Enter n , to create a new partition:. Now choose p to create a new primary partition. Please note, your system can only have 4 primary partitions on this disk! If you've already reached this limit, create an extended partition. Choose your partition number. Choose the first and last sectors for new partition, if you hit ENTER, then by default new partition will use all available disk space.
Now type t to change the partition type. When prompted, enter the number of the partition you've just created in the previous steps. When you're asked to enter the "Hex code", enter 8e , and confirm by hitting enter. Once you get back to the main command within fdisk, type w to write your partitions to the disk. You'll get a message about the kernel still using the old partition table, and to reboot to use the new table.
The reboot is not needed as you can also rescan for those partitions using partprobe. If that does not work for you, you can try to use "partx" to rescan the device and add the new partitions. If that still does not show you the newly created partition for you to use, you have to reboot the server. Afterwards, you can see the newly created partition with fdisk.
Now, create the physical volume as a basis for your LVM. With pvscan , we can see our newly added physical volume, and the usable space 32GB in this case. Now we can extend Logical Volume as opposed to the Physical Volume we added to the group earlier.
We have home , root and swap logical volumes. To extend the logical volume root , execute command:. All that remains now, is to resize the file system to the volume group, so we can use the space. Search this site:. Resource library Videos.
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