diff --git a/plugins/storage/volume/ontap/src/main/java/org/apache/cloudstack/storage/lifecycle/OntapPrimaryDatastoreLifecycle.java b/plugins/storage/volume/ontap/src/main/java/org/apache/cloudstack/storage/lifecycle/OntapPrimaryDatastoreLifecycle.java
index b055dad425a8..e9ba46a4333e 100755
--- a/plugins/storage/volume/ontap/src/main/java/org/apache/cloudstack/storage/lifecycle/OntapPrimaryDatastoreLifecycle.java
+++ b/plugins/storage/volume/ontap/src/main/java/org/apache/cloudstack/storage/lifecycle/OntapPrimaryDatastoreLifecycle.java
@@ -450,8 +450,29 @@ public boolean maintain(DataStore store) {
     @Override
     public boolean cancelMaintain(DataStore store) {
         logger.info("Cancelling storage pool maintenance for {}", store);
+
+        // Save capacity before the generic cancelMaintain path overwrites it.
+        // The generic flow sends ModifyStoragePoolCommand to agents. For managed iSCSI pools,
+        // IscsiAdmStoragePool returns capacityBytes=0 , With capacity=0,
+        // the deployment planner's checkPoolforSpace rejects the pool ("No destination found").
+        StoragePoolVO poolVO = storagePoolDao.findById(store.getId());
+        long savedCapacityBytes = poolVO.getCapacityBytes();
+        long savedUsedBytes = poolVO.getUsedBytes();
+
         if (_dataStoreHelper.cancelMaintain(store)) {
-            return _storagePoolAutomation.cancelMaintain(store);
+            boolean result = _storagePoolAutomation.cancelMaintain(store);
+
+            // Restore capacity
+            poolVO = storagePoolDao.findById(store.getId());
+            if (poolVO.getCapacityBytes() == 0 && savedCapacityBytes > 0) {
+                logger.info("Restoring storage pool {} capacity to {} bytes",
+                        poolVO.getName(), savedCapacityBytes);
+                poolVO.setCapacityBytes(savedCapacityBytes);
+                poolVO.setUsedBytes(savedUsedBytes);
+                storagePoolDao.update(poolVO.getId(), poolVO);
+            }
+
+            return result;
         } else {
             return false;
         }