diff --git a/changelogs/fragments/36811-fix-lvol-valueerror-with-float-size.yaml b/changelogs/fragments/36811-fix-lvol-valueerror-with-float-size.yaml
new file mode 100644
index 00000000000..f784555ee7f
--- /dev/null
+++ b/changelogs/fragments/36811-fix-lvol-valueerror-with-float-size.yaml
@@ -0,0 +1,2 @@
+bugfixes:
+  - lvol - fixed ValueError when using float size (https://github.com/ansible/ansible/issues/32886, https://github.com/ansible/ansible/issues/29429)
diff --git a/lib/ansible/modules/system/lvol.py b/lib/ansible/modules/system/lvol.py
index d123e0fe6ca..e16ad54783d 100644
--- a/lib/ansible/modules/system/lvol.py
+++ b/lib/ansible/modules/system/lvol.py
@@ -211,7 +211,14 @@ import re
 
 from ansible.module_utils.basic import AnsibleModule
 
-decimal_point = re.compile(r"(\d+)")
+
+LVOL_ENV_VARS = dict(
+    # make sure we use the C locale when running lvol-related commands
+    LANG='C',
+    LC_ALL='C',
+    LC_MESSAGES='C',
+    LC_CTYPE='C',
+)
 
 
 def mkversion(major, minor, patch):
@@ -224,7 +231,7 @@ def parse_lvs(data):
         parts = line.strip().split(';')
         lvs.append({
             'name': parts[0].replace('[', '').replace(']', ''),
-            'size': int(decimal_point.match(parts[1]).group(1)),
+            'size': float(parts[1]),
             'active': (parts[2][4] == 'a'),
             'thinpool': (parts[2][0] == 't'),
             'thinvol': (parts[2][0] == 'V'),
@@ -238,9 +245,9 @@ def parse_vgs(data):
         parts = line.strip().split(';')
         vgs.append({
             'name': parts[0],
-            'size': int(decimal_point.match(parts[1]).group(1)),
-            'free': int(decimal_point.match(parts[2]).group(1)),
-            'ext_size': int(decimal_point.match(parts[3]).group(1))
+            'size': float(parts[1]),
+            'free': float(parts[2]),
+            'ext_size': float(parts[3])
         })
     return vgs
 
@@ -278,6 +285,8 @@ def main():
         ),
     )
 
+    module.run_command_environ_update = LVOL_ENV_VARS
+
     # Determine if the "--yes" option should be used
     version_found = get_lvm_version(module)
     if version_found is None:
@@ -354,7 +363,7 @@ def main():
     # Get information on volume group requested
     vgs_cmd = module.get_bin_path("vgs", required=True)
     rc, current_vgs, err = module.run_command(
-        "%s --noheadings -o vg_name,size,free,vg_extent_size --units %s --separator ';' %s" % (vgs_cmd, unit, vg))
+        "%s --noheadings --nosuffix -o vg_name,size,free,vg_extent_size --units %s --separator ';' %s" % (vgs_cmd, unit, vg))
 
     if rc != 0:
         if state == 'absent':
@@ -507,10 +516,10 @@ def main():
         else:
             # resize LV based on absolute values
             tool = None
-            if int(size) > this_lv['size']:
+            if float(size) > this_lv['size']:
                 tool = module.get_bin_path("lvextend", required=True)
-            elif shrink and int(size) < this_lv['size']:
-                if int(size) == 0:
+            elif shrink and float(size) < this_lv['size']:
+                if float(size) == 0:
                     module.fail_json(msg="Sorry, no shrinking of %s to 0 permitted." % (this_lv['name']))
                 if not force:
                     module.fail_json(msg="Sorry, no shrinking of %s without force=yes." % (this_lv['name']))