Veritas Concurrent I/O improves the performance of regular files on a VxFS file system without the need for extending namespaces and presenting the files as devices. This simplifies administrative tasks and allows databases, which do not have a sequential read/write requirement, to access files concurrently. This chapter describes how to use the Concurrent I/O feature.

Quick I/O is still an alternative solution for DMS tablespaces.

See About Quick I/O.

In some cases (for example, if the system has extra memory), Cached Quick I/O may further enhance performance.

See About Cached Quick I/O.

If you are using Oracle 8 and do not need file-level tunable caching, you should use the Concurrent I/O feature. You should use Quick I/O or Cached Quick I/O if you need file-level tunable caching on Oracle 8. If you are using Oracle9 or Oracle 10, we recommend that you use Veritas Extension for Oracle Disk Manager.