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<p class="MsoNormal">Okay, it turns out I was wrong. I thought I had it working, but I keep running into problems. Sometimes when I demote a DRBD resource on Node A and promote it on Node B, and I try to mount the filesystem, the system complains that it cannot
read the superblock. But when I move the DRBD primary back to Node A, the file system is mountable again. Also, I have problems with filesystems not mounting because the vdo devices are not present. All kinds of issues.<o:p></o:p></p>
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<p class="MsoNormal"><b>From:</b> Users <users-bounces@clusterlabs.org> <b>On Behalf Of
</b>Eric Robinson<br>
<b>Sent:</b> Friday, May 14, 2021 3:55 PM<br>
<b>To:</b> Strahil Nikolov <hunter86_bg@yahoo.com>; Cluster Labs - All topics related to open-source clustering welcomed <users@clusterlabs.org><br>
<b>Subject:</b> Re: [ClusterLabs] DRBD + VDO HowTo?<o:p></o:p></p>
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<p class="MsoNormal">Okay, I have it working now. The default systemd service definitions did not work, so I created my own.
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<p class="MsoNormal"><b>From:</b> Strahil Nikolov <<a href="mailto:hunter86_bg@yahoo.com">hunter86_bg@yahoo.com</a>>
<br>
<b>Sent:</b> Friday, May 14, 2021 3:41 AM<br>
<b>To:</b> Eric Robinson <<a href="mailto:eric.robinson@psmnv.com">eric.robinson@psmnv.com</a>>; Cluster Labs - All topics related to open-source clustering welcomed <<a href="mailto:users@clusterlabs.org">users@clusterlabs.org</a>><br>
<b>Subject:</b> RE: [ClusterLabs] DRBD + VDO HowTo?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">There is no VDO RA according to my knowledge, but you can use systemd service as a resource.<o:p></o:p></p>
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<p class="MsoNormal">Yet, the VDO service that comes with thr OS is a generic one and controlls all VDOs - so you need to create your own vdo service.<o:p></o:p></p>
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<p class="MsoNormal">Best Regards,<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Strahil Nikolov<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:Roboto;color:#6D00F6">On Fri, May 14, 2021 at 6:55, Eric Robinson<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:Roboto;color:#6D00F6"><<a href="mailto:eric.robinson@psmnv.com">eric.robinson@psmnv.com</a>> wrote:<o:p></o:p></span></p>
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<p class="yiv6406426161msonormal">I created the VDO volumes fine on the drbd devices, formatted them as xfs filesystems, created cluster filesystem resources, and the cluster us using them. But the cluster won’t fail over. Is there a VDO cluster RA out there
somewhere already? <o:p></o:p></p>
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<p class="yiv6406426161msonormal"> <o:p></o:p></p>
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<p class="yiv6406426161msonormal"><b>From:</b> Strahil Nikolov <<a href="mailto:hunter86_bg@yahoo.com">hunter86_bg@yahoo.com</a>>
<br>
<b>Sent:</b> Thursday, May 13, 2021 10:07 PM<br>
<b>To:</b> Cluster Labs - All topics related to open-source clustering welcomed <<a href="mailto:users@clusterlabs.org">users@clusterlabs.org</a>>; Eric Robinson <<a href="mailto:eric.robinson@psmnv.com">eric.robinson@psmnv.com</a>><br>
<b>Subject:</b> Re: [ClusterLabs] DRBD + VDO HowTo?<o:p></o:p></p>
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<p class="yiv6406426161msonormal"> <o:p></o:p></p>
<p class="yiv6406426161msonormal">For DRBD there is enough info, so let's focus on VDO.<o:p></o:p></p>
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<p class="yiv6406426161msonormal">There is a systemd service that starts all VDOs on the system. You can create the VDO once drbs is open for writes and then you can create your own systemd '.service' file which can be used as a cluster resource.<br>
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Best Regards,<o:p></o:p></p>
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<p class="yiv6406426161msonormal">Strahil Nikolov<o:p></o:p></p>
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<p class="yiv6406426161msonormal"> <o:p></o:p></p>
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<p class="yiv6406426161msonormal"><span style="font-family:"Arial",sans-serif;color:#6D00F6">On Fri, May 14, 2021 at 2:33, Eric Robinson</span><o:p></o:p></p>
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<p class="yiv6406426161msonormal"><span style="font-family:"Arial",sans-serif;color:#6D00F6"><<a href="mailto:eric.robinson@psmnv.com" target="_blank">eric.robinson@psmnv.com</a>> wrote:</span><o:p></o:p></p>
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<p class="yiv6406426161msonormal3">Can anyone point to a document on how to use VDO de-duplication with DRBD? Linbit has a blog page about it, but it was last updated 6 years ago and the embedded links are dead.<o:p></o:p></p>
<p class="yiv6406426161msonormal3"> <o:p></o:p></p>
<p class="yiv6406426161msonormal3"><a href="https://linbit.com/blog/albireo-virtual-data-optimizer-vdo-on-drbd/" target="_blank">https://linbit.com/blog/albireo-virtual-data-optimizer-vdo-on-drbd/</a><o:p></o:p></p>
<p class="yiv6406426161msonormal3"> <o:p></o:p></p>
<p class="yiv6406426161msonormal3">-Eric<o:p></o:p></p>
<p class="yiv6406426161msonormal3"> <o:p></o:p></p>
<p class="yiv6406426161msonormal3"> <o:p></o:p></p>
<p class="yiv6406426161msonormal3"> <o:p></o:p></p>
<p class="yiv6406426161msonormal3"> <o:p></o:p></p>
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