Veritas File System 5.1 SP1 Administrator"s Guide (5900-1499, April 2011)

webcrawlers, search and indexing engines, and replication software that typically

scan an entire file system searching for modifications since a previous scan. FCL

functionality is a separately licensed feature.

See “About the File Change Log file” on page 82.

Multi-volume support

The multi-volume support (MVS) feature allows several volumes to be represented

by a single logical object. All I/O to and from an underlying logical volume is

directed by way of volume sets. This feature can be used only in conjunction with

VxVM. MVS functionality is a separately licensed feature.

See “About multi-volume support” on page 89.

See the Veritas Storage Foundation Release Notes.

SmartTier

The SmartTier option is built on multi-volume support technology. Using

SmartTier, you can map more than one volume to a single file system. You can

then configure policies that automatically relocate files from one volume to

another, or relocate files by running file relocation commands. Having multiple

volumes lets you determine where files are located, which can improve

performance for applications that access specific types of files. SmartTier

functionality is a separately licensed feature.

See the Veritas Storage Foundation Advanced Features Administrator's Guide.

Note: In the previous VxFS 5.x releases, SmartTier was known as Dynamic Storage

Tiering.

Thin Reclamation of a file system

Storage is allocated from a Thin Storage LUN when files are created and written

to a file system. This storage is not given back to the Thin Storage LUN when a

file is deleted or the file size is shrunk. As such, the file system must perform the

explicit task of releasing the free storage to the Thin Storage LUN. This is

performed by the Storage Foundation Thin Reclamation feature. Thin Reclamation

is only supported on VxFS file systems mounted on a VxVM volume.

See the Veritas Storage Foundation Advanced Features Administrator's Guide.

27Introducing Veritas File System

Veritas File System features