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

</ACCAGE>

</WHEN>

</RELOCATE>

Files designated by the rule's SELECT statement are relocated from tier1 volumes

to tier2 volumes if they are between 1 MB and 1000 MB in size and have not been

accessed for 30 days. VxFS relocates qualifying files in the order in which it

encounters them as it scans the file system's directory tree. VxFS stops scheduling

qualifying files for relocation when when it calculates that already-scheduled

relocations would result in tier2 volumes being fully occupied.

The following example illustrates a possible companion rule that relocates files

from tier2 volumes to tier1 ones based on their I/O temperatures. This rule

might be used to return files that had been relocated to tier2 volumes due to

inactivity to tier1 volumes when application activity against them increases.

Using I/O temperature rather than access age as the relocation criterion reduces

the chance of relocating files that are not actually being used frequently by

applications. This rule does not cause files to be relocated unless there is sustained

activity against them over the most recent two-day period.

<FROM>

</SOURCE>

</FROM>

<TO>

</DESTINATION>

</TO>

<WHEN>

</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

Dynamic Storage Tiering

File placement policy rules

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