VERITAS Storage Mapping

VERITAS Storage Mapping is a feature included with VERITAS Storage Foundation for Oracle Enterprise Edition.

VERITAS has defined and implemented a library called VERITAS Federated Mapping Service (VxMS) that provides a mapping interface to VxFS file systems, VxVM volumes, and physical disks. With VERITAS Storage Foundation for Oracle, you can take full advantage of this feature to map datafiles to physical devices and display storage object I/O statistics. With the vxstorage_stats command, you can view the complete I/O topology mapping of datafiles through intermediate layers like logical volumes down to actual physical devices. You can also use vxstorage_stats to view statistics for VxFS file systems, VxVM volumes, and physical devices. This information can be used to determine the exact location of a data block on a disk and to help identify hot spots.

In addition to vxstorage_stats, you can use the dbed_analyzer command to obtain tablespace-to-physical disk mapping information for all the datafiles in a specified database. The command also provides information about the amount of disk space being used by a tablespace. Because the dbed_analyzer command output can be long, it is written to a file for easier viewing.

This command can help you avoid I/O contention. For example, you can use the information to avoid backing up two tablespaces that share the same physical disk.

Both storage object statistics and the storage structure are displayed in the VERITAS Storage Foundation for Oracle GUI.

For more information, see Using Storage Mapping.