# Add, remove, or modify storage volumes with RDS for Oracle
<a name="User_Oracle_AdditionalStorage.ModifyStorageVolumes"></a>

You can add, modify, and remove additional storage volumes using the AWS Management Console or AWS CLI. All operations use the `modify-db-instance` command with the `additional-storage-volumes` parameter.

**Important**  
Adding or removing additional storage volumes creates a backup pending action and a blackout window. The blackout window closes when the backup workflow completes.



## Adding storage volumes
<a name="User_Oracle_AdditionalStorage.ModifyStorageVolumes.Add"></a>

You can add up to three storage volumes beyond the primary storage volume. To add a new storage volume to your RDS for Oracle DB instance, use the `modify-db-instance` command with the `additional-storage-volumes` parameter.

The following code snippet adds a mew 5,000 GiB general purpose SSD (gp3) volume with 4000 provision IOPS name `rdsdbdata3`.

```
aws rds modify-db-instance \
  --db-instance-identifier my-oracle-instance \
  --region us-east-1 \
  --additional-storage-volumes '[
        {
            "VolumeName":"rdsdbdata3",
            "StorageType":"gp3",
            "AllocatedStorage":5000
            "IOPS":4000}
    ]' \
  --apply-immediately
```

## Modifying storage volumes
<a name="User_Oracle_AdditionalStorage.ModifyStorageVolumes.Modifying"></a>

You can modify storage type, allocated storage size, IOPS, and storage throughput settings of your additional storage volume. The following code snippet modifies the IOPS setting for the `rdsdbdata2` volume.

```
aws rds modify-db-instance \
  --db-instance-identifier my-oracle-instance \
  --region us-east-1 \
  --additional-storage-volumes '[
        {
            "VolumeName":"rdsdbdata2",
            "IOPS":8000}
    ]' \
  --apply-immediately
```

**Note**  
You can’t reduce the storage allocation for an additional storage volume once you’ve added it to the instance.

## Removing storage volumes
<a name="User_Oracle_AdditionalStorage.ModifyStorageVolumes.Remove"></a>

You can remove additional storage volumes from RDS for Oracle DB instances when they are no longer needed. Before removing a volume, make sure that you have moved all database files from the volume and no database objects are referencing it. Verify that the volume status is `Not-in-use`. You can remove additional storage volumes, but you can't remove the primary storage volume. 

**Warning**  
Before you remove an additional storage volume, make sure that no database files are stored on the volume. Removing a volume with active database files causes database corruption.

The following example removes the `rdsdbdata4` volume.

```
aws rds modify-db-instance \
  --db-instance-identifier my-oracle-instance \
  --region us-east-1 \
  --additional-storage-volumes '[
        {
            "VolumeName":"rdsdbdata2",
            "SetForDelete":true}
    ]' \
  --apply-immediately
```