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.

With DB2 8.2.2 or later, you can use the Veritas Concurrent I/O feature to improve data write performance for DMS tablespaces with FILE containers. Concurrent I/O can also improve data write performance for most SMS tablespaces.

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.