code: public ValidStorageOptions withIopsToStorageRatio(DoubleRange... iopsToStorageRatio) {
          if (this.iopsToStorageRatio == null) {
              setIopsToStorageRatio(new java.util.ArrayList<DoubleRange>(iopsToStorageRatio.length));
          }
          for (DoubleRange ele : iopsToStorageRatio) {
              this.iopsToStorageRatio.add(ele);
          }
          return this;
      }
docs: <p>
  The valid range of Provisioned IOPS to gibibytes of storage multiplier. For example, 3-10, which means that
  provisioned IOPS can be between 3 and 10 times storage.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setIopsToStorageRatio(java.util.Collection)} or {@link #withIopsToStorageRatio(java.util.Collection)} if
  you want to override the existing values.
  </p>
  
  @param iopsToStorageRatio
  The valid range of Provisioned IOPS to gibibytes of storage multiplier. For example, 3-10, which means
  that provisioned IOPS can be between 3 and 10 times storage.
  @return Returns a reference to this object so that method calls can be chained together.