This read-create value reports the storage type of this filter row, defaulting to nonVolatile, noting that rows created by an external process may instead show readOnly or permanent. An admin checks this to know whether a given filter entry will survive a reboot (nonVolatile or permanent) or was created transiently by another process (readOnly, not settable by SNMP). For example, an admin trying to modify a filter row that reports readOnly storage would need to find the external mechanism that created it, since SNMP SETs to change certain aspects of that row may be rejected.