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    <div class="moz-cite-prefix">On 15/10/15 13:02, Ammar Sheikh Saleh
      wrote:<br>
    </div>
    <blockquote
cite="mid:CAOG9y1WN26UUU6jq48nc1NbT8xNqhKEyK7YK5j7dbb82VZin9w@mail.gmail.com"
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      <div dir="ltr">When ==&gt;  <span
          style="color:rgb(0,0,0);font-size:12.8px">During normal
          operation</span></div>
    </blockquote>
    <br>
    Are you attempting to use ext3/4 on both nodes at the same time? <br>
    <br>
    <blockquote
cite="mid:CAOG9y1WN26UUU6jq48nc1NbT8xNqhKEyK7YK5j7dbb82VZin9w@mail.gmail.com"
      type="cite">
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        <div><span style="color:rgb(0,0,0);font-size:12.8px"><br>
          </span></div>
        <div><span style="color:rgb(0,0,0);font-size:12.8px">What's the
            IO stack below DRBD  ==&gt;  4 Disks in JBOD</span><span
            style="color:rgb(0,0,0);font-size:12.8px"><br>
          </span></div>
        <div><span style="color:rgb(0,0,0);font-size:12.8px"><br>
          </span></div>
        <div><span style="color:rgb(0,0,0);font-size:12.8px">Kernel
            upgrade is not possible now  ... but at the same time its
            not too old  ( v.</span><font color="#000000"><span
              style="font-size:12.8px">2.6.32-431.20.3)</span></font></div>
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    </blockquote>
    <br>
    That kernel belongs to CentOS/RHEL 6.5 which is now approaching 2
    years old and has numerous security vulnerabilities present.<br>
    <br>
    <blockquote
cite="mid:CAOG9y1WN26UUU6jq48nc1NbT8xNqhKEyK7YK5j7dbb82VZin9w@mail.gmail.com"
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      <div class="gmail_extra"><br>
        <div class="gmail_quote">On Thu, Oct 15, 2015 at 2:34 PM, Lars
          Ellenberg <span dir="ltr">&lt;<a moz-do-not-send="true"
              href="mailto:lars.ellenberg@linbit.com" target="_blank">lars.ellenberg@linbit.com</a>&gt;</span>
          wrote:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0
            .8ex;border-left:1px #ccc solid;padding-left:1ex"><span
              class="">On Thu, Oct 15, 2015 at 12:32:11PM +0300, Ammar
              Sheikh Saleh wrote:<br>
              &gt; Hi all,<br>
              &gt;<br>
              &gt; I have one cluster with 2 nodes in active-active -
              master/slave setup<br>
              &gt;<br>
              &gt; I see the following error messages in the system
              logs:<br>
              <br>
            </span>*when*.<br>
            <br>
            After a hard crash?<br>
            After a simulated Crash?<br>
            After a switchover?<br>
            After a failover?<br>
            During normal operation?<br>
            <br>
            What's the IO stack below DRBD?<br>
            <span class=""><br>
              &gt; Jan  5 11:07:23 lws1h1 kernel: EXT4-fs error (device
              drbd1): ext4_mb_generate_buddy: EXT4-fs: group 3785: 27507
              blocks in bitmap, 27576 in gd<br>
              &gt; Jan  5 11:07:53 lws1h1 kernel: EXT4-fs error (device
              drbd1): ext4_mb_generate_buddy: EXT4-fs: group 2437: 9219
              blocks in bitmap, 32546 in gd<br>
              &gt; Jan  5 11:07:53 lws1h1 kernel: EXT4-fs error (device
              drbd1): ext4_mb_generate_buddy: EXT4-fs: group 2438: 9075
              blocks in bitmap, 32760 in gd<br>
              &gt; Jan  5 11:07:53 lws1h1 kernel: EXT4-fs error (device
              drbd1): ext4_mb_generate_buddy: EXT4-fs: group 2442: 9078
              blocks in bitmap, 32768 in gd<br>
              &gt; Jan  5 20:18:27 lws1h1 kernel: JBD: Spotted dirty
              metadata buffer (dev = drbd1, blocknr = 0). There's a risk
              of filesystem corruption in case of system crash.<br>
              &gt; Jan  5 22:02:18 lws1h1 kernel: EXT4-fs error (device
              drbd1): ext4_mb_generate_buddy: EXT4-fs: group 3795: 32532
              blocks in bitmap, 29780 in gd<br>
              &gt; Jan  5 22:02:19 lws1h1 kernel: JBD: Spotted dirty
              metadata buffer (dev = drbd1, blocknr = 0). There's a risk
              of filesystem corruption in case of system crash.<br>
              &gt;<br>
              &gt; What is the appropriate action to fix this issue<br>
              <br>
            </span>Did you even google for the message?<br>
            "JBD: Spotted dirty metadata buffer" turns up several
            bugzillas from<br>
            2010 and 2012, suggesting kernel upgrade would help.<br>
            <span class="HOEnZb"><font color="#888888"><br>
                <br>
                --<br>
                : Lars Ellenberg<br>
                : <a moz-do-not-send="true"
                  href="http://www.LINBIT.com" rel="noreferrer"
                  target="_blank">http://www.LINBIT.com</a> | Your Way
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