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    <div class="moz-cite-prefix">On 7/12/18 10:15 am, G C wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAGdG7F5LY5+5EOscjuhrkO7auBcSo1=peUkRdeQTbXrFZvKjtg@mail.gmail.com">
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                                  <div>Not really clear to me but no
                                    we're not using an SSD.</div>
                                  <div><br>
                                  </div>
                                  <div>(I'm not an expert on LVM so bear
                                    with me)</div>
                                  Are you saying that I would add some
                                  of the new PV to the existing LV so it
                                  can be utilized and then perform a
                                  pvmove later?
                                  <div>If I'm using part of the new PV
                                    as part of the LV how would I ensure
                                    that it's not overwritten when
                                    performing the pvmove later?</div>
                                  <div><br>
                                  </div>
                                  <div>Here are my scenarios below maybe
                                    you can add what you're thinking
                                    into it and it will make more sense
                                    to me.</div>
                                  <div><br>
                                  </div>
                                  <div>Original Scenario:</div>
                                  <div>DISK_1   2TB<br>
                                    pvcreate /dev/sdd<br>
                                  </div>
                                  <div>vgcreate vg01 /dev/sdd<br>
                                  </div>
                                  <div>lvcreate -n 01lv -l 100%FREE vg01<br>
                                  </div>
                                  <div>Device: /dev/vg01/01lv<br>
                                  </div>
                                  <div># drbd setup</div>
                                  <div>drbdadm create-md clusterdb<br>
                                  </div>
                                  <div>drbdadm up clusterdb<br>
                                  </div>
                                  <div>drbdadm primary --force clusterdb<br>
                                  </div>
                                  <div>mkfs.ext4 /dev/drbd0<br>
                                  </div>
                                  <div>mkdir /01<br>
                                  </div>
                                  <div>mount /dev/drbd0 /01<br>
                                  </div>
                                  <div><br>
                                  </div>
                                  <div>RESIZE (ONLINE) - really slow
                                    currently takes over 20hours for the
                                    migration, final outcome is that we
                                    have only one Physical disk after
                                    the move</div>
                                  <div>DISK_2   3TB</div>
                                  <div>pvcreate /dev/sde</div>
                                  <div><span
                                      style="color:rgb(51,51,51);font-family:Arial,sans-serif;font-size:14px">vgextend
                                      vg01 /dev/sde</span><br>
                                  </div>
                                  <div><font face="Arial, sans-serif"
                                      color="#333333"><span
                                        style="font-size:14px">pvmove
                                        /dev/sdd /dev/sde</span></font><br>
                                  </div>
                                  <div><font face="Arial, sans-serif"
                                      color="#333333">
                                      <div><span style="font-size:14px">vgreduce
                                          vg01 /dev/sdd</span></div>
                                      <div><span style="font-size:14px">pvremove
                                          /dev/sdd</span></div>
                                      <div style="font-size:14px">lvextend
                                        -l +100%FREE /dev/vg01/01lv<br>
                                      </div>
                                    </font></div>
                                  <div><span
                                      style="color:rgb(51,51,51);font-family:Arial,sans-serif;font-size:14px">drbdadm
                                      -- --assume-clean resize </span>clusterdb<br>
                                  </div>
                                  <div><span
                                      style="color:rgb(51,51,51);font-family:Arial,sans-serif;font-size:14px">resize2fs
                                      /dev/drbd0</span><span
                                      style="color:rgb(51,51,51);font-family:Arial,sans-serif;font-size:14px"><br>
                                    </span></div>
                                  <div><br>
                                  </div>
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    </blockquote>
    <p>For me, it is like this (simple case with SSD's)<br>
      pvcreate /dev/sde<br>
      vgextend vg01 /dev/sde<br>
      lvextend -L+900G /dev/vg01/01lv<br>
      drbdadm resize clusterdb<br>
    </p>
    <p>A somewhat simple solution to do what you want might be this
      (untested, so check it on a VM or test env first):<br>
      pvcreate /dev/sde<br>
      vgextend vg01 /dev/sde<br>
      lvcreate -n temp -l &lt;xxx&gt; vg01</p>
    <p>Note, the size xxx is exactly equal to the size of 01lv which you
      can check with lvdisplay. This will allocate the first part of sde
      to a new LV called temp, it is just here to use up the space.<br>
    </p>
    <p>
      lvextend -l+100%FREE /dev/vg01/01lv</p>
    <p>Note, I don't usually use this 100%FREE method, but I assume it
      will work right...<br>
    </p>
    <p>
      drbdadm resize clusterdb<br>
    </p>
    <p>This effectively means your LV 01lv is split across sdd and sde,
      which might improve performance, but increases risk if either disk
      dies.</p>
    <p>At any time, you can now lvremove /dev/vg01/temp and can then do
      your pvmove which will move the first 2TB of 01lv from sdd to the
      beginning of sde.</p>
    <p>There is a more complicated method, but this is what I would do
      if faced with your problem. I've also successfully used this
      script:<br>
      <a class="moz-txt-link-freetext" href="https://bisqwit.iki.fi/source/lvm2defrag.html">https://bisqwit.iki.fi/source/lvm2defrag.html</a></p>
    <p>Which can assist you to ensure that the entire disk ends up
      contiguous (though you would need to have at least some temporary
      space, so better not to allocate 100% of the space in the step
      after you create the temp LV).</p>
    <p>Also, why do you allocate 100% of the space? Why not leave some
      space for snapshots, or for future growth? If you had left 100G
      spare, then right now you would simply lvextend to use up the last
      100G, and then have some time to deal with arranging the upgrade.
      Just my suggestions, but I don't understand your needs.<br>
    </p>
    Regards,<br>
    Adam<br>
    <p><br>
    </p>
    <div class="moz-signature">-- <br>
      Adam Goryachev
      Website Managers
      <a class="moz-txt-link-abbreviated" href="http://www.websitemanagers.com.au">www.websitemanagers.com.au</a></div>
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