mirrored cap calcs

vagrant@precise64 /opt/stack/cinder/cinder/volume/drivers $ git diff
diff --git a/cinder/brick/local_dev/lvm.py b/cinder/brick/local_dev/lvm.py
index 0037632..645698d 100644
--- a/cinder/brick/local_dev/lvm.py
+++ b/cinder/brick/local_dev/lvm.py
@@ -626,3 +626,22 @@ class LVM(executor.Executor):
             LOG.error(_('StdOut  :%s') % err.stdout)
             LOG.error(_('StdErr  :%s') % err.stderr)
             raise
+
+    def vg_mirror_free_space(self, mirror_count):
+        free_capacity = 0.0
+        while True:
+            disks = sorted([a for a in self.pv_list if a > 0.0], reverse=True)
+            if len(disks) <= mirror_count:
+                break
+            # consume the smallest disk
+            disk = disks[-1]
+            disks = disks[:-1]
+            # match extents for each mirror on the largest disks
+            for index in range(self.configuration.lvm_mirrors):
+                disks[index] -= disk
+            free_capacity += disk
+        return free_capacity
+
+    def vg_mirror_size(self, mirror_count):
+        return (float(self.vg_free_space.replace(',', '.')) /
+                (mirror_count + 1))
diff --git a/cinder/volume/drivers/lvm.py b/cinder/volume/drivers/lvm.py
index 7c4ac31..285fd92 100644
--- a/cinder/volume/drivers/lvm.py
+++ b/cinder/volume/drivers/lvm.py
@@ -371,11 +371,16 @@ class LVMVolumeDriver(driver.VolumeDriver):
         data["driver_version"] = self.VERSION
         data["storage_protocol"] = self.protocol

-        data['total_capacity_gb'] = float(self.vg.vg_size)
-        data['free_capacity_gb'] = float(self.vg.vg_free_space)
-        if self.configuration.lvm_type == 'thin':
+        if self.configuration.mirror_count > 0:
+            data['total_capacity_gb'] = float(self.vg.vg_mirror_size)
+            data['free_capacity_gb'] = float(self.vg.vg_mirror_free_space)
+        elif self.configuration.lvm_type == 'thin':
             data['total_capacity_gb'] = float(self.vg.vg_thin_pool_size)
             data['free_capacity_gb'] = float(self.vg.vg_thin_pool_free_space)
+        else:
+            data['total_capacity_gb'] = float(self.vg.vg_size)
+            data['free_capacity_gb'] = float(self.vg.vg_free_space)
+
         data['reserved_percentage'] = self.configuration.reserved_percentage
         data['QoS_support'] = False
         data['location_info'] =\
vagrant@precise64 /opt/stack/cinder/cinder/volume/drivers $