diff --git a/operatorapi/error.go b/operatorapi/error.go
index 50ef7b4f8..db10ec24e 100644
--- a/operatorapi/error.go
+++ b/operatorapi/error.go
@@ -38,6 +38,9 @@ var (
 	errLicenseNotFound                    = errors.New("license not found")
 	errAvoidSelfAccountDelete             = errors.New("logged in user cannot be deleted by itself")
 	errAccessDenied                       = errors.New("access denied")
+	errTooFewNodes                        = errors.New("at least 4 nodes are required in cluster")
+	errTooFewSchedulableNodes             = errors.New("at least 4 schedulable nodes are required in cluster")
+	errFewerThanFourNodes                 = errors.New("at least 4 nodes are required in request")
 )
 
 // prepareError receives an error object and parse it against k8sErrors, returns the right error code paired with a generic error message
@@ -156,6 +159,18 @@ func prepareError(err ...error) *models.Error {
 		if errors.Is(err[0], errRemoteTierExists) {
 			errorMessage = err[0].Error()
 		}
+		if errors.Is(err[0], errTooFewNodes) {
+			errorCode = 507
+			errorMessage = errTooFewNodes.Error()
+		}
+		if errors.Is(err[0], errTooFewSchedulableNodes) {
+			errorCode = 507
+			errorMessage = errTooFewSchedulableNodes.Error()
+		}
+		if errors.Is(err[0], errFewerThanFourNodes) {
+			errorCode = 507
+			errorMessage = errFewerThanFourNodes.Error()
+		}
 	}
 	return &models.Error{Code: errorCode, Message: swag.String(errorMessage), DetailedMessage: swag.String(err[0].Error())}
 }
diff --git a/operatorapi/operator_nodes.go b/operatorapi/operator_nodes.go
index 3c0239520..5d02e1f1f 100644
--- a/operatorapi/operator_nodes.go
+++ b/operatorapi/operator_nodes.go
@@ -56,8 +56,8 @@ func registerNodesHandlers(api *operations.OperatorAPI) {
 
 // getMaxAllocatableMemory get max allocatable memory given a desired number of nodes
 func getMaxAllocatableMemory(ctx context.Context, clientset v1.CoreV1Interface, numNodes int32) (*models.MaxAllocatableMemResponse, error) {
-	if numNodes == 0 {
-		return nil, errors.New("error NumNodes must be greated than 0")
+	if numNodes < 4 {
+		return nil, errors.New("error NumNodes must be at least 4")
 	}
 
 	// get all nodes from cluster
@@ -65,6 +65,18 @@ func getMaxAllocatableMemory(ctx context.Context, clientset v1.CoreV1Interface,
 	if err != nil {
 		return nil, err
 	}
+	if len(nodes.Items) < int(numNodes) {
+		return nil, errTooFewNodes
+	}
+	activeNodes := 0
+	for i := 0; i < len(nodes.Items); i++ {
+		if !nodes.Items[i].Spec.Unschedulable {
+			activeNodes++
+		}
+	}
+	if activeNodes < int(numNodes) {
+		return nil, errTooFewSchedulableNodes
+	}
 
 	availableMemSizes := []int64{}
 OUTER:
diff --git a/portal-ui/src/screens/Console/Tenants/AddTenant/Steps/TenantSize.tsx b/portal-ui/src/screens/Console/Tenants/AddTenant/Steps/TenantSize.tsx
index 11bbbc19a..5aadcc5fe 100644
--- a/portal-ui/src/screens/Console/Tenants/AddTenant/Steps/TenantSize.tsx
+++ b/portal-ui/src/screens/Console/Tenants/AddTenant/Steps/TenantSize.tsx
@@ -100,6 +100,8 @@ const TenantSize = ({
   selectedStorageClass,
 }: ITenantSizeProps) => {
   const [validationErrors, setValidationErrors] = useState<any>({});
+  const [errorFlag, setErrorFlag] = useState<boolean>(false);
+  const [nodeError, setNodeError] = useState<string>("");
   const usableInformation = ecParityCalc.storageFactors.find(
     (element) => element.erasureCode === ecParity
   );
@@ -131,7 +133,6 @@ const TenantSize = ({
       clusterSizeFactor
     );
     const memoSize = setMemoryResource(memSize, clusterSizeBytes, maxMemSize);
-
     updateField("memorySize", memoSize);
   }, [maxAllocableMemo, memoryNode, sizeFactor, updateField, volumeSize]);
 
@@ -146,8 +147,9 @@ const TenantSize = ({
           const maxMemory = res.max_memory ? res.max_memory : 0;
           updateField("maxAllocableMemo", maxMemory);
         })
-        .catch((err: ErrorResponseHandler) => {
-          updateField("maxAllocableMemo", 0);
+        .catch((err: any) => {
+          setErrorFlag(true);
+          setNodeError(err.errorMessage);
           console.error(err);
         });
     }
@@ -227,7 +229,6 @@ const TenantSize = ({
 
   useEffect(() => {
     const parsedSize = getBytes(volumeSize, sizeFactor, true);
-
     const commonValidation = commonFormValidation([
       {
         fieldKey: "nodes",
@@ -236,6 +237,13 @@ const TenantSize = ({
         customValidation: parseInt(nodes) < 4,
         customValidationMessage: "Number of nodes cannot be less than 4",
       },
+      {
+        fieldKey: "nodes",
+        required: true,
+        value: nodes,
+        customValidation: errorFlag,
+        customValidationMessage: nodeError,
+      },
       {
         fieldKey: "volume_size",
         required: true,
@@ -288,6 +296,8 @@ const TenantSize = ({
     limitSize,
     selectedStorageClass,
     isPageValid,
+    errorFlag,
+    nodeError
   ]);
 
   /* End Validation of pages */