Category Linux

LVM Snapshot

LVM snapshot is a special type of logical volume which contains all the data in the source logical volume at the time of snapshot creation. Once the snapshot is created, all the changes made to the source local volume will only be saved in snapshot.So the amount of space necessary […]

Removing a physical volume

3 cases for removing the physical volume   ¬†If PFree and Psize are equal which means the physical volume don’t have any data in it , so we can directly remove the physical volume from the volume group by vgreduce and then remove the physical volume by pvremove.¬†Example in the […]

Extending a volume group

Size of volume group can be extended by adding more physical volume to the group. No downtime is required for extending a volume group Step 1: Creating a physical volume [root@server1 ~]# pvcreate /dev/sdf Physical volume “/dev/sdf” successfully created [root@server1 ~]# pvs PV VG Fmt Attr PSize PFree /dev/sdb VG01 […]

Creating a logical volume

Architecture : Step 1: Creating physical volume Following disk will be used to create the logical volume /dev/sdb – 10GB /dev/sdc – 10GB /dev/sdd – 10GB /dev/sde – 10GB [root@server1 ~]# fdisk -l |grep “Disk /dev/” Disk /dev/sda: 21.5 GB, 21474836480 bytes, 41943040 sectors Disk /dev/sdb: 10.7 GB, 10737418240 bytes, […]

Extending a logical volume

Logical volume can be extended on the fly without any downtime Step 1: List the logical volume and check the current size. Here i am going to extend the LV01 to 30G by adding 5Gb to the current size 25GB [root@server1 ~]# lvs LV VG Attr LSize Pool Origin Data% […]

LVM Basics

Logical volume manger provides flexibilty to the system administrator to manage storage volumes. Storage volumes created under LVM can be resized,moved on the fly. There are 2 versions of LVM in linux – LVM 2 – LVM 1 LVM Architecture: Types of LVM -linear volumes -striped volumes -mirrored volumes   […]