diff --git a/lib/puppet/provider/logical_volume/lvm.rb b/lib/puppet/provider/logical_volume/lvm.rb
index 1e1099c..049ccce 100644
--- a/lib/puppet/provider/logical_volume/lvm.rb
+++ b/lib/puppet/provider/logical_volume/lvm.rb
@@ -3,6 +3,7 @@ Puppet::Type.type(:logical_volume).provide :lvm do
     
     commands :lvcreate => 'lvcreate',
              :lvremove => 'lvremove',
+             :lvextend => 'lvextend',
              :lvs      => 'lvs',
              :umount   => 'umount',
              :mount    => 'mount'
@@ -34,4 +35,65 @@ Puppet::Type.type(:logical_volume).provide :lvm do
         "/dev/#{@resource[:volume_group]}/#{@resource[:name]}"
     end
     
+    def size
+        if @resource[:size] =~ /^\d+.{0,1}\d{0,2}([mMgGtTpPeE])/
+            unit = $1.downcase
+        end
+        
+        if lvs('--noheading', '--unit', unit, path) =~ /\s+(\d+)\.(\d+)#{unit}/
+            if $2.to_i == 00
+                return $1 + unit.capitalize
+            else
+                return $1 + '.' + $2 + unit.capitalize
+            end
+        end
+    end
+    
+    def size=(size)
+        lvm_size_units = { "M" => 1024, "G" => 1048576, "T" => 1073741824, "P" => 1099511627776, "E" => 1125899906842624 }
+        lvm_size_units_match = lvm_size_units.keys().join('|')
+        
+        resizeable = false
+        current_size = size()
+        
+        if current_size =~ /(\d+\.{0,1}\d{0,2})(#{lvm_size_units_match})/
+            current_size_bytes = $1.to_i
+            current_size_unit  = $2
+        end
+        
+        if size =~ /(\d+)(#{lvm_size_units_match})/
+            new_size_bytes = $1.to_i
+            new_size_unit  = $2
+        end
+        
+        ## Get the extend size
+        if lvs('--noheading', '-o', 'vg_extent_size', '--units', 'k', path) =~ /\s+(\d+)\.\d+k/
+            vg_extent_size = $1.to_i
+        end
+        
+        ## Check if new size fits the extend blocks
+        if new_size_bytes * lvm_size_units[new_size_unit] % vg_extent_size != 0
+            fail( "Cannot extend to size #{size} because VG extent size is #{vg_extent_size} KB" )
+        end
+        
+        ## Veritfy that it's a extension: Reduce is potentially dangerous and should be done manually
+        if lvm_size_units[current_size_unit] < lvm_size_units[new_size_unit]
+            resizeable = true
+        elsif lvm_size_units[current_size_unit] > lvm_size_units[new_size_unit]
+            if (current_size_bytes / lvm_size_units[current_size_unit]) < (new_size_bytes / lvm_size_units[new_size_unit])
+                resizeable = true
+            end
+        elsif lvm_size_units[current_size_unit] == lvm_size_units[new_size_unit]
+            if new_size_bytes > current_size_bytes
+                resizeable = true
+            end
+        end
+        
+        if not resizeable
+            fail( "Decreasing the size requires manual intervention (#{size} < #{current_size})" )
+        else
+            return lvextend( '-L', size, path)
+        end        
+    end
+    
 end
diff --git a/lib/puppet/type/logical_volume.rb b/lib/puppet/type/logical_volume.rb
index 39ca71c..e353735 100644
--- a/lib/puppet/type/logical_volume.rb
+++ b/lib/puppet/type/logical_volume.rb
@@ -17,8 +17,14 @@ Puppet::Type.newtype(:logical_volume) do
             set this volume group as a dependency, but it must be defined elsewhere using the
             volume_group resource type."
     end
-
-    newparam(:size) do
+    
+    newproperty(:size) do
         desc "The size of the logical volume. Set to undef to use all available space"
+        
+        validate do |value|
+            unless value =~ /^[0-9]+[MGTPE]/
+                raise ArgumentError , "%s is not a valid lv size" % value
+            end
+        end
     end
 end