In our previous article we have learned how to create lvm partition and mount them permanently in /etc/fstab .
before going with advance lvm management. In this tutorial guide we will learn about advance lvm management. In our pervious article we have created two lvm partitions. Now we will manage them. First we will extend the size of lv00 our first lvm partition.
Check all these partition are functioning properly
Check the current size of lv00
As you can see the current size of lv00 is 100MB. To extend it with 50MB space run these commands
Now we will reduce the size of 20MB from lvm partition.
If you have free space in lvm partition no data lose will happen. Lose in data will happen only when partition is full.
at this moment you should be able to extend and reduce the size of lvm partition now we will remove these partitions
don't forget to remove these partitions form /etc/fstab also
now use fdisk command to delete these partition form hard disk
run partprobe command to tell kernel about change and verify it
Do these practical of lvm as much as you can as RHCE is performance based exam and none of us will want to retake it. We have summarized all important commands in a single table cram it.
|partprobe||To notify kernel about the change in device|
|pvcreate||To create physical volume|
|pvdisplay||To display the size and other information about physical volume|
|pvremove||To remove the physical volume|
|pvresize||To modify the size of physical volume|
|pvscan||To scan the physical volume|
|vgextend||to extend the size of volume group|
|vgreduce||to reduce the size of volume group|
|vgscan||to scan the volume group for change|
|vgdisplay||to display the status and information about volume group|
|lvdisplay||will display the status of lvm|
|lvreduce||to reduce the size of lvm|
|lvextend||to extend the size of lvm|
|lvcreate||to create the lvm|
|lvremove||to remove the lvm partition|
|lvscan||to scan lvm for change|
|fdisk||-l||To show the current partition status of hard disk|
|fdisk||/dev/sda||To invoke fdisk utility on /dev/sda|
|n||to create new partition|
|t||to define file types|
|d||to delete partitions|
|w||to save change|