Prefer attribute

Article:HOWTO59528  |  Created: 2011-10-12  |  Updated: 2011-10-12  |  Article URL http://www.symantec.com/docs/HOWTO59528
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Prefer attribute

You can specify a value for the Prefer attribute for the <IOTEMP> and <ACCESSTEMP> criteria, which gives preference to relocating files. The Prefer attribute can take two values: low or high. If you specify low, Veritas File System (VxFS) relocates the files with the lower I/O temperature before relocating the files with the higher I/O temperature. If you specify high, VxFS relocates the files with the higher I/O temperature before relocating the files with the lower I/O temperature. Symantec recommends that you specify a Prefer attribute value only if you are using solid state disks (SSDs).

See Prefer mechanism.

Different <PERIOD> elements may be used in the <IOTEMP> and <ACCESSTEMP> criteria of different RELOCATE statements within the same policy.

The following placement policy snippet gives an example of the Prefer criteria:

   <RELOCATE>
      ...
      <WHEN>
         <IOTEMP Type="nrbytes" Prefer="high">
            <MIN Flags="gteq"> 3.4 </MIN>
            <PERIOD Units="hours"> 6 </PERIOD>
         </IOTEMP>
      </WHEN>
   </RELOCATE>

If there are a number of files whose I/O temperature is greater than the given minimum value, the files with the higher temperature are first subject to the RELOCATE operation before the files with the lower temperature.

See RELOCATE statement


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uxrt-51sp1_v40222304_v63475671


Article URL http://www.symantec.com/docs/HOWTO59528


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