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<title>Example: Increasing free space</title>

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<h1><img src="images/l_array.gif" width="28" height="28">Example: Increasing free
  space </h1>
<p>Create an pool with three physical drives. Then, create two logical devices
  (labeled 1 and 2) in the pool such that you have no available free space. The
  logical device stripes look similar to the following.</p>
<div align="center"><img src="images/freespac.gif" width="220" height="105"></div>
<p>Later, you decide to create another logical device in the pool.
  First, you must create some free space by adding more physical drives to the
  pool. </p>
<div align="center"> <img src="images/d3mg3a10.gif" width="317" height="104"> </div>
<p>If you add two more physical drives to the pool, the logical devices migrate
      such that they are striped across all five drives. The HP Storage Manager
      retains the size of the logical device by decreasing the size of each block
      on a physical drive. The space in the logical devices does not increase,
      so there is free space across the bottom portion of each physical drive
      (labeled 3).</p>
<div align="center"> <img src="images/d3mg3a15.gif" width="386" height="137"></div>
<p>When the operation is complete, use &quot;<a href="aexpldcc.htm">Create logical
  drive</a>&quot; to create a new logical device in the free space. </p>
<p>When increasing free space, you can add up to three physical drives, as long
  as the sum of the physical drives does not exceed the maximum number of physical
  drives allowed for the pool. The maximum number of physical drives you can
  have in an pool is limited by the controller <a href="cstripe.htm">stripe-unit
  size</a>.</p>
<h2>More information</h2>
<ul>
  <li><a href="cstripe.htm">Understanding stripe-unit size</a></li>
  <li><a href="ccrearry.htm">Understanding creating basic pools</a></li>
  <li><a href="ccreld.htm">Understanding creating logical devices</a></li>
  <li><a href="ccfgstep.htm">Creating logical devices</a></li>
  <li><a href="aexpldcc.htm">Increasing logical device size (action)</a></li>
</ul>

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