Veritas Storage Foundation 5.1 SP1 Advanced Features Administrator"s Guide (5900-1503, April 2011)

<MIN Flags="gt">5</MIN>
<PERIOD>2</PERIOD>
</IOTEMP>
</WHEN>
</RELOCATE>
This rule relocates files that reside on tier2 volumes to tier1 volumes if their
I/O temperatures are above 5 for the two day period immediately preceding the
issuing of the fsppadm enforce command. VxFS relocates qualifying files in the
order in which it encounters them during its file system directory tree scan. When
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:
<RELOCATE>
<FROM>
<SOURCE>
<CLASS>tier1</CLASS>
</SOURCE>
</FROM>
<TO>
<DESTINATION>
<CLASS>tier2</CLASS>
</DESTINATION>
<DESTINATION>
<CLASS>tier3</CLASS>
</DESTINATION>
</TO>
<WHEN>
<IOTEMP Type="nrbytes">
<MAX Flags="lt">4</MAX>
<PERIOD>3</PERIOD>
</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
365Administering SmartTier
File placement policy rules