Veritas File System 5.0 Administrator's Guide (September 2006)

<!-- Specification for CLASS element

The file system resides on a multi-component volume set.

Each volume in the volume set will be in what is called a

placement class. The placement classes are implemented as tags

on the volumes. These tags are organized into a hierarchy prefix.

The placement policy uses the vxfs.placement_class. prefix.

The CLASS element specifies the placement class of the

underlying storage, without the prefix. For example, if a

volume has a placement class of vxfs.placment_class.gold

then gold would be the value of CLASS element.

-->

<!ELEMENT CLASS (#PCDATA)>

<!-- Specification for PERCENT element

(THIS IS NOT IMPLEMENTED)

If the PERCENT element is in DESTINATION element, it determines

how much of its CLASS can be filled up with the files selected

by a given RULE.

If the PERCENT element is in SOURCE element, it determines

how much of its CLASS can be emptied when the files are relocated

our deleted from it.

-->

<!ELEMENT PERCENT (#PCDATA)>

<!-- Specification for BALANCE_SIZE element

Multiple volumes may have the same placement class and there can

be multiple DESTINATIONs (hence CLASSes) in a given ON (and TO)

element. If a BALANCE_SIZE is specified for a given CLASS,

the usage of volumes of that given placement class will be used

evenly by allocating BALANCE_SIZE amount of space for each

volume for each allocation.

-->

<!ELEMENT BALANCE_SIZE (#PCDATA)>

<!-- The possible and accepted values for Units are:

1. bytes

147Dynamic Storage Tiering

File placement policy grammar