Veritas File System v5.0.1 Administrator's Guide for HP-UX 11i v3 (5900-0082, June 2010)

Multiple conditions in <WHEN> clauses of RELOCATE and DELETE

statements

The <WHEN> clause in RELOCATE and DELETE statements may include multiple

relocation criteria. Any or all of <ACCAGE>, <MODAGE>, <SIZE>, and <IOTEMP> can

be specified. When multiple conditions are specified, all must be satisfied in order

for a selected file to qualify for relocation or deletion.

In the following example, a selected file would have to be both inactive, that is,

not accessed, for more than 30 days and larger than 100 megabytes to be eligible

for relocation or deletion:

<WHEN>

</ACCAGE>

</SIZE>

</WHEN>

You cannot write rules to relocate or delete a single designated set of files if the

files meet one of two or more relocation or deletion criteria.

File placement policy rule and statement ordering

You can use the Dynamic Storage Tiering graphical user interface (GUI) to create

any of four types of file placement policy documents. Alternatively, you can use

a text editor or XML editor to create XML policy documents directly. The GUI

places policy rule statements in the correct order to achieve the desired behavior.

If you use a text editor, it is your responsibility to order policy rules and the

statements in them so that the desired behavior results.

The rules that comprise a placement policy may occur in any order, but during

both file allocation and fsppadm enforce relocation scans, the first rule in which

a file is designated by a SELECT statement is the only rule against which that file

is evaluated. Thus, rules whose purpose is to supersede a generally applicable

behavior for a special class of files should precede the general rules in a file

placement policy document.

The following XML snippet illustrates faulty rule placement with potentially

unintended consequences:

<?xml version="1.0"?>

<!DOCTYPE FILE_PLACEMENT_POLICY SYSTEM "placement.dtd">

Dynamic Storage Tiering

File placement policy rule and statement ordering

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