Veritas™ File System 5.0.1 Administrator's Guide

In the following example, only files that reside in either the ora/db or the
crash/dump directory, and whose owner is either user1 or user2 are selected for
possible action:
<SELECT>
<DIRECTORY Flags="nonrecursive">ora/db</DIRECTORY>
<DIRECTORY Flags="nonrecursive">crash/dump</DIRECTORY>
<USER>user1</USER>
<USER>user2</USER>
</SELECT>
A rule may include multiple SELECT statements. If a file satisfies the selection
criteria of one of the SELECT statements, it is eligible for action.
In the following example, any files owned by either user1 or user2, no matter in
which directories they reside, as well as all files in the ora/db or crash/dump
directories, no matter which users own them, are eligible for action:
<SELECT>
<DIRECTORY Flags="nonrecursive">ora/db</DIRECTORY>
<DIRECTORY Flags="nonrecursive">crash/dump</DIRECTORY>
</SELECT>
<SELECT>
<USER>user1</USER>
<USER>user2</USER>
</SELECT>
When VxFS creates new files, VxFS applies active placement policy rules in the
order of appearance in the active placement policy's XML source file. The first
rule in which a SELECT statement designates the file to be created determines the
file's placement; no later rules apply. Similarly, VxFS scans the active policy rules
on behalf of each file when relocating files, stopping the rules scan when it reaches
the first rule containing a SELECT statement that designates the file. This behavior
holds true even if the applicable rule results in no action. Take for example a
policy rule that indicates that .dat files inactive for 30 days should be relocated,
and a later rule indicates that .dat files larger than 10 megabytes should be
relocated. A 20 megabyte .dat file that has been inactive for 10 days will not be
relocated because the earlier rule applied. The later rule is never scanned.
A placement policy rule's action statements apply to all files designated by any
of the rule's SELECT statements. If an existing file is not designated by a SELECT
statement in any rule of a file system's active placement policy, then DST does
not relocate or delete the file. If an application creates a file that is not designated
by a SELECT statement in a rule of the file system's active policy, then VxFS places
the file according to its own internal algorithms. If this behavior is inappropriate,
153Dynamic Storage Tiering
File placement policy rules