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    I meant repeats 60 secs at a stretch. If not, as it seems so, then
    the messages<br>
    should be only annoying.<br>
    <br>
    VMFS uses SCSI Reservation to perform disk based locking. See if
    they have<br>
    some logging in ESX that shows when a VMFS performs
    reserve/unreserve<br>
    on a SCSI device. You'll have to look at the logs of all nodes. As
    in, that log<br>
    will be on a different node than that that got this error.<br>
    <br>
    BTW, any reason you are not using RDM.<br>
    <br>
    On 12/14/2010 12:51 PM, brad hancock wrote:
    <blockquote
      cite="mid:AANLkTimFvrEnHaabiSq9DJP9EmUyqHQsYrMO8f=LxS8t@mail.gmail.com"
      type="cite">The issue does repeat.&nbsp;
      <div>
        <div><br>
        </div>
        <div>I looked through the vsphere 4.1, and the host logs and
          didn't see anything weird that&nbsp;corresponds&nbsp;with these times.&nbsp;</div>
        <div><br>
        </div>
        <div>What is a&nbsp;reservation&nbsp;conflict? Can this issue cause the
          nodes to see different data?</div>
        <div><br>
        </div>
        <div><br>
        </div>
        <div>Dec 14 07:37:52 mdcvmsmes02 kernel: [351952.113847] sd
          1:0:0:0: reservation conflict</div>
        <div>Dec 14 07:37:52 mdcvmsmes02 kernel: [351952.113859] sd
          1:0:0:0: [sdb] Result: hostbyte=DID_OK
          driverbyte=DRIVER_OK,SUGGEST_OK</div>
        <div>Dec 14 07:37:52 mdcvmsmes02 kernel: [351952.113868]
          end_request: I/O error, dev sdb, sector 1735</div>
        <div>Dec 14 07:37:52 mdcvmsmes02 kernel: [351952.114134]
          (0,0):o2hb_bio_end_io:225 ERROR: IO Error -5</div>
        <div>Dec 14 07:37:52 mdcvmsmes02 kernel: [351952.114379]
          (1882,0):o2hb_do_disk_heartbeat:753 ERROR: status = -5</div>
        <div>Dec 14 07:51:01 mdcvmsmes02 kernel: [352762.233764] sd
          1:0:0:0: reservation conflict</div>
        <div>Dec 14 07:51:01 mdcvmsmes02 kernel: [352762.233775] sd
          1:0:0:0: [sdb] Result: hostbyte=DID_OK
          driverbyte=DRIVER_OK,SUGGEST_OK</div>
        <div>Dec 14 07:51:01 mdcvmsmes02 kernel: [352762.233855]
          end_request: I/O error, dev sdb, sector 1735</div>
        <div>Dec 14 07:51:01 mdcvmsmes02 kernel: [352762.234112]
          (0,0):o2hb_bio_end_io:225 ERROR: IO Error -5</div>
        <div>Dec 14 07:51:01 mdcvmsmes02 kernel: [352762.234365]
          (1882,0):o2hb_do_disk_heartbeat:753 ERROR: status = -5</div>
        <div>Dec 14 07:51:01 mdcvmsmes02 kernel: [352762.234789] sd
          1:0:0:0: reservation conflict</div>
        <div>Dec 14 07:51:01 mdcvmsmes02 kernel: [352762.234793] sd
          1:0:0:0: [sdb] Result: hostbyte=DID_OK
          driverbyte=DRIVER_OK,SUGGEST_OK</div>
        <div>Dec 14 07:51:01 mdcvmsmes02 kernel: [352762.234796]
          end_request: I/O error, dev sdb, sector 1735</div>
        <div>Dec 14 07:51:01 mdcvmsmes02 kernel: [352762.235033]
          (0,0):o2hb_bio_end_io:225 ERROR: IO Error -5</div>
        <div>Dec 14 07:51:01 mdcvmsmes02 kernel: [352762.235273]
          (1882,0):o2hb_do_disk_heartbeat:753 ERROR: status = -5</div>
        <div>Dec 14 09:23:15 mdcvmsmes02 kernel: [358423.734356] sd
          1:0:0:0: reservation conflict</div>
        <div>Dec 14 09:23:15 mdcvmsmes02 kernel: [358423.734366] sd
          1:0:0:0: [sdb] Result: hostbyte=DID_OK
          driverbyte=DRIVER_OK,SUGGEST_OK</div>
        <div>Dec 14 09:23:15 mdcvmsmes02 kernel: [358423.734370]
          end_request: I/O error, dev sdb, sector 1735</div>
        <div>Dec 14 09:23:15 mdcvmsmes02 kernel: [358423.734620]
          (0,0):o2hb_bio_end_io:225 ERROR: IO Error -5</div>
        <div>Dec 14 09:23:15 mdcvmsmes02 kernel: [358423.734882]
          (1882,0):o2hb_do_disk_heartbeat:753 ERROR: status = -5</div>
        <div>Dec 14 10:25:27 mdcvmsmes02 kernel: [362254.184302] sd
          1:0:0:0: reservation conflict</div>
        <div>Dec 14 10:25:27 mdcvmsmes02 kernel: [362254.184312] sd
          1:0:0:0: [sdb] Result: hostbyte=DID_OK
          driverbyte=DRIVER_OK,SUGGEST_OK</div>
        <div>Dec 14 10:25:27 mdcvmsmes02 kernel: [362254.184316]
          end_request: I/O error, dev sdb, sector 1735</div>
        <div>Dec 14 10:25:27 mdcvmsmes02 kernel: [362254.184565]
          (0,0):o2hb_bio_end_io:225 ERROR: IO Error -5</div>
        <div>Dec 14 10:25:27 mdcvmsmes02 kernel: [362254.184809]
          (1882,0):o2hb_do_disk_heartbeat:753 ERROR: status = -5</div>
        <div>Dec 14 10:25:27 mdcvmsmes02 kernel: [362254.188045] sd
          1:0:0:0: reservation conflict</div>
        <div>Dec 14 10:25:27 mdcvmsmes02 kernel: [362254.188045] sd
          1:0:0:0: [sdb] Result: hostbyte=DID_OK
          driverbyte=DRIVER_OK,SUGGEST_OK</div>
        <div>Dec 14 10:25:27 mdcvmsmes02 kernel: [362254.188045]
          end_request: I/O error, dev sdb, sector 1735</div>
        <div>Dec 14 10:25:27 mdcvmsmes02 kernel: [362254.188045]
          (0,0):o2hb_bio_end_io:225 ERROR: IO Error -5</div>
        <div>Dec 14 10:25:27 mdcvmsmes02 kernel: [362254.188045]
          (1882,0):o2hb_do_disk_heartbeat:753 ERROR: status = -5</div>
        <div>Dec 14 10:33:08 mdcvmsmes02 kernel: [362727.621062] sd
          1:0:0:0: reservation conflict</div>
        <div>Dec 14 10:33:08 mdcvmsmes02 kernel: [362727.621062] sd
          1:0:0:0: [sdb] Result: hostbyte=DID_OK
          driverbyte=DRIVER_OK,SUGGEST_OK</div>
        <div>Dec 14 10:33:08 mdcvmsmes02 kernel: [362727.621062]
          end_request: I/O error, dev sdb, sector 1735</div>
        <div>Dec 14 10:33:08 mdcvmsmes02 kernel: [362727.621062]
          (0,0):o2hb_bio_end_io:225 ERROR: IO Error -5</div>
        <div>Dec 14 10:33:08 mdcvmsmes02 kernel: [362727.621062]
          (1882,0):o2hb_do_disk_heartbeat:753 ERROR: status = -5</div>
        <div>Dec 14 10:33:08 mdcvmsmes02 kernel: [362727.621062] sd
          1:0:0:0: reservation conflict</div>
        <div>Dec 14 10:33:08 mdcvmsmes02 kernel: [362727.621062] sd
          1:0:0:0: [sdb] Result: hostbyte=DID_OK
          driverbyte=DRIVER_OK,SUGGEST_OK</div>
        <div>Dec 14 10:33:08 mdcvmsmes02 kernel: [362727.621062]
          end_request: I/O error, dev sdb, sector 1735</div>
        <div>Dec 14 10:33:08 mdcvmsmes02 kernel: [362727.621062]
          (0,0):o2hb_bio_end_io:225 ERROR: IO Error -5</div>
        <div>Dec 14 10:33:08 mdcvmsmes02 kernel: [362727.621062]
          (1882,0):o2hb_do_disk_heartbeat:753 ERROR: status = -5</div>
      </div>
      <div><br>
      </div>
      <div><br>
      </div>
      <div><br>
      </div>
      <div><br>
      </div>
      <div><br>
      </div>
      <div><br>
        <br>
        <div class="gmail_quote">On Tue, Dec 14, 2010 at 11:38 AM, Sunil
          Mushran <span dir="ltr">&lt;<a moz-do-not-send="true"
              href="mailto:sunil.mushran@oracle.com">sunil.mushran@oracle.com</a>&gt;</span>
          wrote:<br>
          <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
            0.8ex; border-left: 1px solid rgb(204, 204, 204);
            padding-left: 1ex;">
            <div bgcolor="#ffffff" text="#000000">
              <div>
                <div class="im">sd 1:0:0:0: reservation conflict<br>
                  <br>
                </div>
                That's the cause of the error in the guest. You'll have
                to track the error<br>
                to ESX's management domain. See the logs.<br>
                <br>
                Does this error come repeatedly? This error is only a
                problem for o2hb<br>
                if it continues for the next 60 secs. Else it can be
                ignored.
                <div>
                  <div class="h5"><br>
                    <br>
                    On 12/14/2010 07:20 AM, brad hancock wrote:</div>
                </div>
              </div>
              <blockquote type="cite">
                <div>
                  <div class="h5">The issue is starting to come up
                    again. Both machines are logging the error a couple
                    of minutes apart from each other.
                    <div><br>
                      <div>sd 1:0:0:0: reservation conflict</div>
                      <div>Dec 13 16:40:07 mdcvmsmes01 kernel:
                        [295051.378262] sd 1:0:0:0: [sdb] Result:
                        hostbyte=DID_OK d</div>
                      <div>Dec 13 16:40:07 mdcvmsmes01 kernel:
                        [295051.378347] end_request: I/O error, dev sdb,
                        sector 173</div>
                      <div>Dec 13 16:40:07 mdcvmsmes01 kernel:
                        [295051.378694] (0,1):o2hb_bio_end_io:225 ERROR:
                        IO Error -</div>
                      <div>Dec 13 16:40:07 mdcvmsmes01 kernel:
                        [295051.379055]
                        (1897,1):o2hb_do_disk_heartbeat:753 ERROR:</div>
                    </div>
                    <div><br>
                    </div>
                    <div>Should I open a bug report? Who with, VMware or
                      Oracle?</div>
                    <div><br>
                    </div>
                    <div><br>
                    </div>
                    <div><br>
                      <div class="gmail_quote">On Sun, Dec 12, 2010 at
                        9:25 AM, brad hancock <span dir="ltr">&lt;<a
                            moz-do-not-send="true"
                            href="mailto:braddhancock@gmail.com"
                            target="_blank">braddhancock@gmail.com</a>&gt;</span>
                        wrote:<br>
                        <blockquote class="gmail_quote" style="margin:
                          0pt 0pt 0pt 0.8ex; border-left: 1px solid
                          rgb(204, 204, 204); padding-left: 1ex;">Kevin,
                          <div>I modified the VMFS&nbsp;virtual&nbsp;disk to
                            Independent, and I haven't seen the issue
                            since the change Friday morning. I noticed
                            this didn't work for you. I will continue to
                            watch it and let the list know. The issue I
                            saw after several weeks was the data was not
                            in sync. Two nodes saw different data on the
                            same OCFS2 drive.&nbsp;</div>
                          <div><br>
                          </div>
                          <div>We have Vsphere 4.1, and HP EVA 3000 SAN.
                            &nbsp;</div>
                          <div><br>
                          </div>
                          <div>Thanks,</div>
                          <div>
                            <div>
                              <div><br>
                              </div>
                              <div><br>
                                <br>
                                <div class="gmail_quote">On Sat, Dec 11,
                                  2010 at 10:41 AM, <span dir="ltr">&lt;<a
                                      moz-do-not-send="true"
                                      href="mailto:kevin@utahsysadmin.com"
                                      target="_blank">kevin@utahsysadmin.com</a>&gt;</span>
                                  wrote:<br>
                                  <blockquote class="gmail_quote"
                                    style="margin: 0pt 0pt 0pt 0.8ex;
                                    border-left: 1px solid rgb(204, 204,
                                    204); padding-left: 1ex;">
                                    <div>On Fri, 10 Dec 2010 06:26:06
                                      -0800, <a moz-do-not-send="true"
href="mailto:ocfs2-users-request@oracle.com" target="_blank">ocfs2-users-request@oracle.com</a>
                                      wrote:<br>
                                      &gt;<br>
                                      &gt; My setup has the SCSI
                                      controller set to Physical so the
                                      guest can be on<br>
                                      &gt; different hosts, but I do not
                                      have the disk setup as
                                      Independent. I am<br>
                                      &gt; going<br>
                                      &gt; to change that setting in
                                      VMware and see if it makes a
                                      difference.<br>
                                      &gt;<br>
                                    </div>
                                    <div>&gt; &gt; [2037805.922718]
                                      end_request: I/O error, dev sdb,
                                      sector 1735<br>
                                      &gt; &gt; [2037805.922974]
                                      (0,0):o2hb_bio_end_io:225 ERROR:
                                      IO Error -5<br>
                                      &gt; &gt; [2037805.923370]
                                      (27506,0):o2hb_do_disk_heartbeat:753
                                      ERROR: status =<br>
                                      -5<br>
                                      <br>
                                    </div>
                                    Brad,<br>
                                    <br>
                                    I have had the same issue for over a
                                    year on ESX 3.5 as well as on
                                    vSphere<br>
                                    4.0. &nbsp;I have not tried yet on 4.1.
                                    &nbsp;The error occurs when I put the
                                    shared<br>
                                    disk on either SATA or FC LUNs on
                                    our SAN. &nbsp;It also doesn't matter if
                                    the<br>
                                    virtual machines are on the same
                                    physical host or not (with
                                    independent<br>
                                    disks). &nbsp;The only problem that has
                                    come from it is the occasional
                                    reboot of<br>
                                    one of the VMs, which for me is
                                    tolerable. &nbsp;I keep hoping to upgrade
                                    to a<br>
                                    new SAN thinking that might fix it.
                                    &nbsp;The vSphere 4.0 release IOPS<br>
                                    capability is higher than the SAN
                                    (it's 5 years old) so I didn't think
                                    it<br>
                                    was VMware's fault. &nbsp;If you have
                                    fairly new hardware, maybe there is
                                    a real<br>
                                    bug somewhere. &nbsp;I don't get I/O
                                    errors in any of my other
                                    implementations<br>
                                    on this SAN. &nbsp;I sent a post like
                                    yours to the list when I first built
                                    it,<br>
                                    but never opened a bug report with
                                    either OCFS or VMware. &nbsp;If you
                                    create a<br>
                                    bug report I could add information
                                    from my implementation as well. &nbsp;(I<br>
                                    actually have two of these setups
                                    and they both have the same errors.)<br>
                                    <br>
                                    Of course, if you find a solution,
                                    please post that as well.<br>
                                    <br>
                                    Thanks,<br>
                                    Kevin<br>
                                    <br>
                                    <br>
                                  </blockquote>
                                </div>
                                <br>
                              </div>
                            </div>
                          </div>
                        </blockquote>
                      </div>
                      <br>
                    </div>
                  </div>
                </div>
                <pre><fieldset></fieldset>
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              </blockquote>
              <br>
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          </blockquote>
        </div>
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