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 a206eaa053df..bd238ee70515 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
@@ -526,7 +526,26 @@ public boolean migrateToObjectStore(DataStore store) {
 
     @Override
     public void updateStoragePool(StoragePool storagePool, Map<String, String> details) {
+        long currentCapacityBytes = storagePool.getCapacityBytes();
+        long newCapacityBytes = Long.parseLong(details.get(PrimaryDataStoreLifeCycle.CAPACITY_BYTES));
+        StorageStrategy storageStrategy = OntapStorageUtils.getStrategyByStoragePoolDetails(details);
 
+        Volume volume = new Volume();
+        volume.setUuid(details.get(OntapStorageConstants.VOLUME_UUID));
+        volume.setName(details.get(OntapStorageConstants.VOLUME_NAME));
+        try {
+            if (volume.getUuid() == null || volume.getUuid().isEmpty() || volume.getName() == null || volume.getName().isEmpty()) {
+                logger.error("Volume UUID/Name not found in details for pool: {}, cannot resize", storagePool.getName());
+                throw new CloudRuntimeException("Volume UUID/Name not found in details, cannot resize ONTAP FlexVolume");
+            }
+            storageStrategy.updateStorageVolume(volume, newCapacityBytes);
+            logger.info("Successfully resized ONTAP FlexVolume '{}' (UUID: {}) for pool '{}' from {} bytes to {} bytes",
+                    volume.getName(), volume.getUuid(), storagePool.getName(), currentCapacityBytes, newCapacityBytes);
+        } catch (Exception e) {
+            logger.error(" Exception while resizing FlexVolume for pool: {}. Error: {}",
+                    storagePool.getName(), e.getMessage(), e);
+            throw new CloudRuntimeException("Failed to resize ONTAP FlexVolume for pool: " + storagePool.getName() + ". " + e.getMessage(), e);
+        }
     }
 
     @Override
diff --git a/plugins/storage/volume/ontap/src/main/java/org/apache/cloudstack/storage/service/StorageStrategy.java b/plugins/storage/volume/ontap/src/main/java/org/apache/cloudstack/storage/service/StorageStrategy.java
index 0ef295418118..cbb5c43d3779 100644
--- a/plugins/storage/volume/ontap/src/main/java/org/apache/cloudstack/storage/service/StorageStrategy.java
+++ b/plugins/storage/volume/ontap/src/main/java/org/apache/cloudstack/storage/service/StorageStrategy.java
@@ -367,11 +367,25 @@ public Volume createStorageVolume(String volumeName, Long size) {
      * @param volume the volume to update
      * @return the updated Volume object
      */
-    public Volume updateStorageVolume(Volume volume) {
-        return null;
+    public Volume updateStorageVolume(Volume volume, Long newSizeBytes) {
+        String authHeader = OntapStorageUtils.generateAuthHeader(storage.getUsername(), storage.getPassword());
+        Volume resizeRequest = new Volume();
+        resizeRequest.setSize(newSizeBytes);
+        try {
+            JobResponse jobResponse = volumeFeignClient.updateVolumeRebalancing(authHeader, volume.getUuid(), resizeRequest);
+            Boolean jobSucceeded = jobPollForSuccess(jobResponse.getJob().getUuid(), 10, 1000);
+            if (!jobSucceeded) {
+                logger.error("resize job failed for FlexVolume: " + volume.getName());
+                throw new CloudRuntimeException("resize job failed for FlexVolume: " + volume.getName());
+            }
+             logger.info("Volume is resized successfully for : " + volume.getName());
+        } catch (FeignException e) {
+            logger.error("Exception while resizing FlexVolume: " + volume.getName(), e);
+            throw new CloudRuntimeException("Failed to resize ONTAP FlexVolume: " + e.getMessage(), e);
+        }
+        return volume;
     }
-
-    /**
+            /**
      * Delete ONTAP Flex-Volume
      * Eligible only for Unified ONTAP storage
      * throw exception in case of disaggregated ONTAP storage