weizhouapache commented on code in PR #10039:
URL: https://github.com/apache/cloudstack/pull/10039#discussion_r1869679145


##########
plugins/hypervisors/kvm/src/main/java/org/apache/cloudstack/kvm/ha/KVMHAProvider.java:
##########
@@ -84,18 +84,24 @@ public boolean recover(Host r) throws HARecoveryException {
 
     @Override
     public boolean fence(Host r) throws HAFenceException {
-
         try {
-            if (outOfBandManagementService.isOutOfBandManagementEnabled(r)){
-                final OutOfBandManagementResponse resp = 
outOfBandManagementService.executePowerOperation(r, PowerOperation.OFF, null);
-                return resp.getSuccess();
+            // host exists and is managed OOB
+            if (r != null && 
outOfBandManagementService.isOutOfBandManagementEnabled(r)) {
+                // check host status
+                if (Host.Status.DOWN.equals(r.getStatus())) {
+                    LOG.info("Host " + r.getName() + " is already down. 
Returning success.");
+                    return true;
+                } else {
+                    final OutOfBandManagementResponse resp = 
outOfBandManagementService.executePowerOperation(r, PowerOperation.OFF, null);
+                    return resp.getSuccess();
+                }
             } else {
-                logger.warn("OOBM fence operation failed for this host " + 
r.getName());
+                LOG.warn("OOBM fence operation failed for this host " + 
r.getName());

Review Comment:
   @leo79901 
   should it be `logger` instead of `LOG` ?



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