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  <div class="titlepage">
   <div>
    <div>
     <h4 class="title">
      <a name="mysql-cluster-ndbinfo-diskstat">
      </a>
      25.6.17.32 The ndbinfo diskstat Table
     </h4>
    </div>
   </div>
  </div>
  <a class="indexterm" name="idm46045089402848">
  </a>
  <p>
   The
   <code class="literal">
    diskstat
   </code>
   table provides information about
        writes to Disk Data tablespaces during the past 1 second.
  </p>
  <p>
   The
   <code class="literal">
    diskstat
   </code>
   table contains the following
        columns:
  </p>
  <div class="itemizedlist">
   <ul class="itemizedlist" style="list-style-type: disc; ">
    <li class="listitem">
     <p>
      <code class="literal">
       node_id
      </code>
     </p>
     <p>
      Node ID of this node
     </p>
    </li>
    <li class="listitem">
     <p>
      <code class="literal">
       block_instance
      </code>
     </p>
     <p>
      ID of reporting instance of
      <a class="ulink" href="/doc/ndb-internals/en/ndb-internals-kernel-blocks-pgman.html" target="_top">
       <code class="literal">
        PGMAN
       </code>
      </a>
     </p>
    </li>
    <li class="listitem">
     <p>
      <code class="literal">
       pages_made_dirty
      </code>
     </p>
     <p>
      Number of pages made dirty during the past second
     </p>
    </li>
    <li class="listitem">
     <p>
      <code class="literal">
       reads_issued
      </code>
     </p>
     <p>
      Reads issued during the past second
     </p>
    </li>
    <li class="listitem">
     <p>
      <code class="literal">
       reads_completed
      </code>
     </p>
     <p>
      Reads completed during the past second
     </p>
    </li>
    <li class="listitem">
     <p>
      <code class="literal">
       writes_issued
      </code>
     </p>
     <p>
      Writes issued during the past second
     </p>
    </li>
    <li class="listitem">
     <p>
      <code class="literal">
       writes_completed
      </code>
     </p>
     <p>
      Writes completed during the past second
     </p>
    </li>
    <li class="listitem">
     <p>
      <code class="literal">
       log_writes_issued
      </code>
     </p>
     <p>
      Number of times a page write has required a log write during
            the past second
     </p>
    </li>
    <li class="listitem">
     <p>
      <code class="literal">
       log_writes_completed
      </code>
     </p>
     <p>
      Number of log writes completed during the last second
     </p>
    </li>
    <li class="listitem">
     <p>
      <code class="literal">
       get_page_calls_issued
      </code>
     </p>
     <p>
      Number of
      <code class="literal">
       get_page()
      </code>
      calls issued during
            the past second
     </p>
    </li>
    <li class="listitem">
     <p>
      <code class="literal">
       get_page_reqs_issued
      </code>
     </p>
     <p>
      Number of times that a
      <code class="literal">
       get_page()
      </code>
      call
            has resulted in a wait for I/O or completion of I/O already
            begun during the past second
     </p>
    </li>
    <li class="listitem">
     <p>
      <code class="literal">
       get_page_reqs_completed
      </code>
     </p>
     <p>
      Number of
      <code class="literal">
       get_page()
      </code>
      calls waiting for
            I/O or I/O completion that have completed during the past
            second
     </p>
    </li>
   </ul>
  </div>
  <h5>
   <a name="idm46045089372048">
   </a>
   Notes
  </h5>
  <p>
   Each row in this table corresponds to an instance of
   <a class="ulink" href="/doc/ndb-internals/en/ndb-internals-kernel-blocks-pgman.html" target="_top">
    <code class="literal">
     PGMAN
    </code>
   </a>
   ; there is one such
        instance per LDM thread plus an additional instance for each
        data node.
  </p>
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