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<p class="MsoNormal">Greetings,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’ve read the relevant sections of the DRBD User Guide, visited various web sites, and spoken to people in the lists, but I’m still looking for a simple rule of thumb.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Basically, here is what I’ve come to understand:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">If DRBD only lives *<b>above</b>* an LVM volume, then the default LVM filtering settings are fine; no changes are required to lvm.conf. The LVs will remain active on all DRBD nodes,
and an LVM resource agent is not required. <o:p></o:p></li></ol>
<p class="MsoListParagraph"><o:p> </o:p></p>
<ol style="margin-top:0in" start="2" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">If DRBD lives *<b>below</b>* or *<b>between</b>* LVM volumes, then:<o:p></o:p></li></ol>
<p class="MsoListParagraph"><o:p> </o:p></p>
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<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level2 lfo1">set global_filter to reject the DRBD backing devices<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level2 lfo1">set write_cache_state = 0<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level2 lfo1">set use_lvmetad = 0<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level2 lfo1">set volume_list to include block devices required to boot<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level2 lfo1">remove /etc/lvm/cache/.cache.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level2 lfo1">run lvscan<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level2 lfo1">regenerate initrd<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level2 lfo1">reboot<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level2 lfo1">Use a cluster resource agent to activate/de-activate LVs as required by cluster operation<o:p></o:p></li></ol>
</ol>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Please feel free to correct any mistakes.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">--Eric<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><img width="500" height="96" style="width:5.2083in;height:1.0in" id="Picture_x0020_1" src="cid:image001.png@01D60983.14DF69C0"><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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