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=====Linux LVM Tips=====

Resize a partition

   - **lvextend --size +15g /dev///vg-name/vol-name//** - increase a volume by 15GB
   - **resize2fs /dev///vg-name/vol-name//** - resize the filesystem to the same size as the volume

Extending a filesystem using a new LUN - (Linux VM example)

   - Format the disk with **fdisk** as a linux VM fstype 
   - **vgextend //vgname// /dev/sd//xx//** - add the newdisk to a volume group
   - Check the volume group by running **vgdisplay -v //vgname//**
   - Move the disk: **pvmove /dev///old-disk// /dev///new-disk//**
   - Now extend the volume: **lvextend -l +//nnnnn// /dev///vg-name/lv-name//**
   - Extend the filesystem: **resize2fs /dev///vg-name/lv-name//**
   - Remove the old disk: **vgreduce //vg-name// /dev/sd//xx//**
   - Delete the device: **echo "1" > /sys/block///device-name//device/delete**
   - In the vSphere client, for the VM, edit settings -> select drive -> remove

Creating a logical volume that will use all available space in a volume group

   - **lvcreate -n //vol-name// -L 1m /dev///vg-name//** - create a 1MB volume
   - **lvextend -l +100%FREE /dev///vg-name/vol-name//** - extend the volume using all available space
   - **mkfs -t ext3 /dev///vg-name/vol-name//** - create the filesystem

Importing a LVM Volume

   - **vgscan** - make sure the volume group is visible to the target server
   - **vgchange -a y my-vg** - activate the volume group my-vg
   - **ls /dev/mapper** - LVM devices in the volume group should now be present
   - **mount /dev/mapper/my-vg-lv /mnt** - mount the logical volume

Importing a volume with a conflicting volume group name (the VG name already exists on target server)

   - Present the volume containing the VG to the server
   - Run **lvmdiskscan** to check the disk is visible
   - **vgdisplay -v** - make a note of the conflicting VG UUID
   - Rename the VG by using the UUID e.g. **vgrename VG-UUID vg00-import**
   - Activate the renamed VG: **vgchange -a y vg00-import**
   - You can now mount the logical volume(s)

Migrating a volume with pvmove e.g. to a LUN on a different disk array

   - pvcreate the new disk: **pvcreate /dev/mapper/mpathNEW**
   - Add to the volume group used by the volume to migrate: **vgextent my_vg /dev/mapper/mpathNEW**
   - Start moving the data: **pvmove -b /dev/mapper/mpathOLD /dev/mapper/mpathNEW**
   - You can check the progress as follows: **lvs -a -o+devices**
   - Once the move is complete, remove the old LUN from the volume group: **vgreduce my_vg /dev/mapper/mpathOLD**
   - Finally, one it's confirmed everything is working as expected, you can run: **pvremove /dev/mapper/mpathOLD**

If you get stuck with old devices, this page [[linux_storage]] will tell you how to delete them
  
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