You can use Snapshot copies in the SAN environment when the data within a Data ONTAP LUN is in a consistent state.
Data ONTAP cannot ensure that the data within a LUN is in a consistent state. That is, Data ONTAP does not know whether an application is accessing the data inside the LUN. Therefore, before creating a Snapshot copy, you need to quiesce the application or file system using the LUN. This action flushes the host file system buffers to disk. Quiescing ensures that the Snapshot copy is consistent.
One way to accomplish this is to use batch files and scripts on a host that has administrative access to the system.