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<p class="MsoNormal">Hi all,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">the following error occurs reproducible on various drbd-mirrors we are using:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">drbd r0: BAD! BarrierAck #1729154 received, expected #1729153!<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">And it always ends in an splitbrain, as we are using dual-primary ocfs2 on these devices.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">OS is Ubuntu server 16.04 x64 with 4.4.0-87-generic Kernel and:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">cat /proc/drbd<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">version: 8.4.5 (api:1/proto:86-101)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Network link, is directly connected fiber from server to server via 10Gbit:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">product: MT26448 [ConnectX EN 10GigE, PCIe 2.0 5GT/s]<o:p></o:p></span></p>
<p class="MsoNormal">vendor: Mellanox Technologies<o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">driver=mlx4_en driverversion=2.2-1 (Feb 2014) duplex=full firmware=2.9.1000<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">using different storage devices (nvme SSDs;SATA AHCI SSDs, mdadm RAID10 over HDDs ..)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">We think that the error occurs especially in load situations.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Network link problems, physically, can be ruled out as a cause.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Maybe anyone has an idea on this, or even solved it before.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks in advance for any answers.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Regards, CS<o:p></o:p></span></p>
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