Veritas File System 5.0 AdministratorÆs Guide, HP-UX 11i v3, First Edition, May 2008

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File placement policy rules

A VxFS file placement policy consists of one or more rules. Each rule applies to

one or more files. The files to which a rule applies are designated in one or more

SELECT statements. A SELECT statement designates files according to one or more

of four properties: their names or naming patterns, the directories in which they

reside, their owners' user names, and their owners' group names.

A file may be designated by more than one rule. For example, if one rule designates

files in directory /dir, and another designates files owned by user1, a file in /dir

that is owned by user1 is designated by both rules. Only the rule that appears

first in the placement policy applies to the file; subsequent rules are ignored.

You can define placement policies that do not encompass the entire file system

name space. When a file that is not designated by any rule in its file system's

active placement policy is created, VxFS places the file according to its own internal

algorithms. To maintain full control over file placement, include a catchall rule

at the end of each placement policy document with a SELECT statement that

designates files by the naming pattern *. Such a rule designates all files that have

not been designated by the rules appearing earlier in the placement policy

document.

SELECT statement

The VxFS placement policy rule SELECT statement designates the collection of

files to which a rule applies.

The following XML snippet illustrates the general form of the SELECT statement:

153Dynamic Storage Tiering

File placement policy rules