update grain name for ceph OSDs

Related-Prod: PROD-35230
Change-Id: Idbd3114d0d6e1d802a2a925dbc5a83136fd2a5f4
diff --git a/update-ceph.groovy b/update-ceph.groovy
index 5953ae6..accd8f8 100644
--- a/update-ceph.groovy
+++ b/update-ceph.groovy
@@ -60,7 +60,7 @@
             }
 
             stage('Restart OSDs') {
-                def device_grain_name =  salt.getPillar(pepperEnv,"I@ceph:osd","ceph:osd:lvm_enabled")['return'].first().containsValue(true) ? "ceph_volume" : "ceph_disk"
+                def device_grain_name =  "ceph_disk"
                 selMinions = salt.getMinions(pepperEnv, "I@ceph:osd")
                 for (tgt in selMinions) {
                     salt.runSaltProcessStep(pepperEnv, tgt, 'saltutil.sync_grains', [], null, true, 5)