Veritas File System performance enhancements


Veritas File System performance enhancements
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Traditional file systems employ block-based allocation schemes that provide adequate random access and latency for small files, but limit throughput for larger files. As a result, they are less than optimal for commercial environments.

Veritas File System (VxFS) addresses this file system performance issue through an alternative allocation method and increased user control over allocation, I/O, and caching policies.

See Using Veritas File System.

VxFS provides the following performance enhancements:

Data synchronous I/O

See Data synchronous I/O.
Direct I/O and discovered direct I/O

See Direct I/O.

See Discovered Direct I/O.
Delayed allocation for extending writes

See Delayed allocation for extending writes.
Enhanced I/O performance

See Enhanced I/O performance.
Caching advisories

See Cache advisories.
Enhanced directory features
Explicit file alignment, extent size, and preallocation controls

See Extent attribute alignment.

See Fixed extent size.

See Reservation: preallocating space to a file.
Tunable I/O parameters

See Tuning the VxFS file system.
Integration with Veritas Volume Manager (VxVM)

See About Veritas Volume Manager.
Support for large directories

Note:

VxFS reduces the file lookup time in directories with an extremely large number of files.
Partitioned directories

See the vxtunefs(1M) and fsadm_vxfs(1M) manual pages.

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