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

tier1 volumes are fully occupied, VxFS stops scheduling qualifying files for

relocation.

VxFS file placement policies are able to control file placement across any number

of placement classes. The following example illustrates a rule for relocating files

with low I/O temperatures from tier1 volumes to tier2 volumes, and to tier3

volumes when tier2 volumes are fully occupied:

<FROM>

</SOURCE>

</FROM>

<TO>

</DESTINATION>

</DESTINATION>

</TO>

<WHEN>

</IOTEMP>

</WHEN>

</RELOCATE>

This rule relocates files whose 3-day I/O temperatures are less than 4 and which

reside on tier1 volumes. When VxFS calculates that already-relocated files would

result in tier2 volumes being fully occupied, VxFS relocates qualifying files to

tier3 volumes instead. VxFS relocates qualifying files as it encounters them in

its scan of the file system directory tree.

The <FROM> clause in the RELOCATE statement is optional. If the clause is not

present, VxFS evaluates files designated by the rule's SELECT statement for

relocation no matter which volumes they reside on when the fsppadm enforce

command is issued. The following example illustrates a fragment of a policy rule

that relocates files according to their sizes, no matter where they reside when the

fsppadm enforce command is issued:

<TO>

Dynamic Storage Tiering

File placement policy rules

168