diff --git a/src/WINNT/afsd/cm_daemon.c b/src/WINNT/afsd/cm_daemon.c
index 5e47a7f323..0469c8db50 100644
--- a/src/WINNT/afsd/cm_daemon.c
+++ b/src/WINNT/afsd/cm_daemon.c
@@ -30,7 +30,7 @@ long cm_daemonCheckDownInterval  = 180;
 long cm_daemonCheckUpInterval    = 240;
 long cm_daemonCheckVolInterval   = 3600;
 long cm_daemonCheckCBInterval    = 60;
-long cm_daemonCheckVolCBInterval = 1800;
+long cm_daemonCheckVolCBInterval = 0;
 long cm_daemonCheckLockInterval  = 60;
 long cm_daemonTokenCheckInterval = 180;
 long cm_daemonCheckOfflineVolInterval = 600;
@@ -347,7 +347,8 @@ void cm_Daemon(long parm)
     now = osi_Time();
     lastVolCheck = now - cm_daemonCheckVolInterval/2 + (rand() % cm_daemonCheckVolInterval);
     lastCBExpirationCheck = now - cm_daemonCheckCBInterval/2 + (rand() % cm_daemonCheckCBInterval);
-    lastVolCBRenewalCheck = now - cm_daemonCheckVolCBInterval/2 + (rand() % cm_daemonCheckVolCBInterval);
+    if (cm_daemonCheckVolCBInterval)
+        lastVolCBRenewalCheck = now - cm_daemonCheckVolCBInterval/2 + (rand() % cm_daemonCheckVolCBInterval);
     lastLockCheck = now - cm_daemonCheckLockInterval/2 + (rand() % cm_daemonCheckLockInterval);
     lastDownServerCheck = now - cm_daemonCheckDownInterval/2 + (rand() % cm_daemonCheckDownInterval);
     lastUpServerCheck = now - cm_daemonCheckUpInterval/2 + (rand() % cm_daemonCheckUpInterval);
@@ -406,7 +407,8 @@ void cm_Daemon(long parm)
 	    now = osi_Time();
         }
 
-        if (now > lastVolCBRenewalCheck + cm_daemonCheckVolCBInterval) {
+        if (cm_daemonCheckVolCBInterval && 
+            now > lastVolCBRenewalCheck + cm_daemonCheckVolCBInterval) {
             lastVolCBRenewalCheck = now;
             cm_VolumeRenewROCallbacks();
             now = osi_Time();
diff --git a/src/WINNT/afsd/cm_volume.c b/src/WINNT/afsd/cm_volume.c
index e2d9d62ba7..326b6ef7d3 100644
--- a/src/WINNT/afsd/cm_volume.c
+++ b/src/WINNT/afsd/cm_volume.c
@@ -1496,16 +1496,18 @@ enum volstatus cm_GetVolumeStatus(cm_volume_t *volp, afs_uint32 volID)
     }
 }
 
-
+/* Renew .readonly volume callbacks that are more than
+ * 30 minutes old.  (A volume callback is issued for 2 hours.)
+ */
 void 
 cm_VolumeRenewROCallbacks(void)
 {
     cm_volume_t * volp;
-
+    time_t minexp = time(NULL) + 90 * 60;
 
     lock_ObtainRead(&cm_volumeLock);
     for (volp = cm_data.allVolumesp; volp; volp=volp->allNextp) {
-        if ( volp->cbExpiresRO > 0) {
+        if ( volp->cbExpiresRO > 0 && volp->cbExpiresRO < minexp) {
             cm_req_t      req;
             cm_fid_t      fid;
             cm_scache_t * scp;