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<a name="Partition-Attribute-Data_005fLocation"></a>
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<a name="Partition-Attribute-Data_005fLocation-1"></a>
<h4 class="subsubsection">8.5.4.13 Partition Attribute Data_Location</h4>

<p>Shared passive units can be mapped on passive or active partitions. In
both cases, it is possible to choose the data storage support and to
configure it with the specific data of a location.
</p>
<div class="smallexample">
<pre class="smallexample">

REPRESENTATION_CLAUSE ::=
   <b>for</b> PARTITION_IDENTIFIER'Data_Location <b>use</b> LOCATION;
 | <b>for</b> PARTITION_IDENTIFIER'Data_Location <b>use</b> LOCATION_LIST;

</pre></div>

<p>When an attribute data_location definition clause applies to a given
partition, the data storage support units needed for this partition are
linked in the executable. By default, when the data_location attribute
is not redefined, the default storage support used by the partition and
loaded in its executable is the <i>dfs</i> support. <i>dfs</i>, Distributed
File System, is a storage support available as soon as files can be
shared between partitions.
</p>
<p>It is not possible to map the different shared passive units of a given
partition on different data storage locations. PolyORB requires all the
shared passive units of a given partition to be mapped on the same
storage support. When the attribute data_location applied to a partition
is a list of locations, all the storage support units needed for this
partition are linked in the executable. By default, only the first one
is activated. The user can choose to change the activated support by
another one specified in the location list. This can be done using the
partition option data_location (see &lsquo;Partition Option
data_location&rsquo;).
</p>
<p>As passive partitions cannot be activated, it is not possible to provide
a location list as a data_location attribute. It is not possible to
change dynamically its location either.
</p>



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polyorb-doc 2.11~20140418-3.2 / usr / share / doc / polyorb-doc / html / polyorb_ug / Partition-Attribute-Data_005fLocation.html
