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<p class="MsoNormal"><span style="color:#1F497D">DRBD can’t use /dev/md4 because it’s in use. It has a mounted filesystem using the entire device.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">You have your resource stack out of order. You would share the drbd device created from the md4 device. However, /dev/md4 already has a file system so you must shrink it or use external metadata. I’d suggest
you shrink it and use internal metadata.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">What you have:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">There are various disk devices (not specified)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Upon which is run raid providing /dev/md4<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Which contains an ext2 filesystem (/srv)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Which is shared.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">What you want:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">There are various disk devices (not specified)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Upon which is run raid providing /dev/md4<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Which is the backing device for DRBD<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Which provides /dev/drbd1<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Which contains an ext2 filesystem (/srv)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Which is shared.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Clear as mud?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Dan<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> drbd-user-bounces@lists.linbit.com [mailto:drbd-user-bounces@lists.linbit.com]
<b>On Behalf Of </b>Martin Krammer, New Media Interactive<br>
<b>Sent:</b> Monday, August 19, 2013 4:16 AM<br>
<b>To:</b> drbd-user@lists.linbit.com<br>
<b>Subject:</b> [DRBD-user] DRDB over Software RAID1 - Failure: (104) Can not open backing device<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif"">I have two webservers running debian 7 (stable) with software RAID1 and DRBD 8.3.11.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif"">On both servers there are the following shares, which should be connected:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif"">On stella: /dev/md4 919014380 204664 872126436 1% /srv<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif"">On laura: /dev/md4 442143360 153168996 266514700 37% /srv<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Later, the data of laura should be syncronized on /dev/drdb1.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif"">The conf-file looks like:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif"">resource r1 {<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif""> on stella {<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif""> device /dev/drbd1;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif""> disk /dev/md4;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif""> address 192.168.1.1:7789;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif""> meta-disk /dev/sdb3[0];<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif""> }<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif""> on laura {<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif""> device /dev/drbd1;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif""> disk /dev/md4;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif""> address 192.168.1.2:7789;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif""> meta-disk /dev/sdb2[0];<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif""> }<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif"">}<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif"">If I try to attach…<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif"">root@stella:/srv# drbdadm attach r1<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif""> --== Thank you for participating in the global usage survey ==--<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif"">The server's response is:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif"">node already registered<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif"">1: Failure: (104) Can not open backing device.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Command 'drbdsetup 1 disk /dev/md4 /dev/sdb3 0 --set-defaults --create-device --on-io-error=detach' terminated with exit code 10<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT">Could anybody help me please?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="DE-AT">Martin.<o:p></o:p></span></p>
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