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</o:shapelayout></xml><![endif]--></head><body lang=DE-AT link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Hi there,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>I am involved in the aftermath of a split brain event (drbd 8.3.8). log files have given us several entries for </span><span lang=EN-US>drbd_sync_handshakes<span style='color:#1F497D'>:</span><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l3 level1 lfo2'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Feb 28 07:10:04 san02 kernel: [ 1435.507176] block drbd1: self 384ACFA6DDE7F305:6EC706A11FB6AAEB:AD2868A6C65F20AA:D5016EA9D8E57175 bits:28397184 flags:0<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l3 level1 lfo2'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Feb 28 07:10:04 san02 kernel: [ 1435.507472] block drbd0: self 8FFC8087A5A8ACDF:128A2EF7246101ED:00C719D52E8C2482:4EEC506B23021307 bits:225135 flags:0<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l3 level1 lfo2'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Feb 28 07:11:36 san01 kernel: [4427691.562720] block drbd1: self 16DA13A883B368DA:6EC706A11FB6AAEA:AD2868A6C65F20AA:D5016EA9D8E57175 bits:3072 flags:0<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l3 level1 lfo2'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>4.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Feb 28 07:11:36 san01 kernel: [4427691.562923] block drbd0: self 2DBF62FFC79BF9F4:128A2EF7246101EC:00C719D52E8C2483:4EEC506B23021307 bits:53722300 flags:0<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l3 level1 lfo2'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>5.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Feb 28 07:17:46 san02 kernel: [ 1897.442652] block drbd0: self 8FFC8087A5A8ACDE:8A4BA5176FB14BAD:128A2EF7246101ED:00C719D52E8C2482 bits:21858 flags:0<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l3 level1 lfo2'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>6.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Feb 28 07:17:46 san02 kernel: [ 1897.443239] block drbd1: self 384ACFA6DDE7F304:E9797096C25A015C:6EC706A11FB6AAEB:AD2868A6C65F20AA bits:24262845 flags:0<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l3 level1 lfo2'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>7.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Feb 28 07:19:19 san01 kernel: [4428153.502129] block drbd0: self 8A4BA5176FB14BAC:0000000000000000:00C719D52E8C2483:4EEC506B23021307 bits:49588595 flags:0<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l3 level1 lfo2'><![if !supportLists]><span style='mso-list:Ignore'>8.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Feb 28 07:19:19 san01 kernel: [4428153.502363] block drbd1: self E9797096C25A015C:0000000000000000:AD2868A6C65F20AA:D5016EA9D8E57175 bits:0 flags:0<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>The</span><span lang=EN-US> Cluster <span style='color:#1F497D'>consists of 2 nodes</span> (san01 und san02) <span style='color:#1F497D'>with two block devices</span> (drbd01 und drbd02) <span style='color:#1F497D'>running in dual primary with </span>OCFS2.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Analyzing</span> Generation Identifier<span style='color:#1F497D'>s oft he first handshake:</span><o:p></o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l1 level1 lfo4'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Current UUIDs (1.-4.) <span style='color:#1F497D'>differ due to split brainsituation.</span><o:p></o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l1 level1 lfo4'><![if !supportLists]><span lang=EN-US style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]> <span lang=EN-US>BitMap UUIDs (1.-4.) <span style='color:#1F497D'>are nearly identical</span>. <span style='color:#1F497D'>Only the last digit differs from </span>A-D. <span style='color:#1F497D'>First</span> Historical UUID<span style='color:#1F497D'>s</span> (1.-4.) <span style='color:#1F497D'>with</span> drbd1 <span style='color:#1F497D'>are identical but differ for</span> block drbd0<span style='color:#1F497D'>. Again only the last digit</span> (2 <span style='color:#1F497D'>vs</span> 3).<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l1 level1 lfo4'><![if !supportLists]><span lang=EN-US style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US style='color:#1F497D'>Second</span><span lang=EN-US> Historical UUID (1.-4.) <span style='color:#1F497D'>for both</span> block-Devices <span style='color:#1F497D'>are identical meaning both devices have the same data set, or?</span><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Questions</span>:<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo8'><![if !supportLists]><span lang=EN-US style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US style='color:#1F497D'>Reason and meaning for differing last digit UUIDs are unknown. No information in the doc.</span><span lang=EN-US><o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo8'><![if !supportLists]><span lang=EN-US style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US style='color:#1F497D'>How can I see when the data sets were sync for the last time?</span><span lang=EN-US><o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo8'><![if !supportLists]><span lang=EN-US style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US style='color:#1F497D'>Meaning of values for flags fe </span><span lang=EN-US>0<span style='color:#1F497D'> o</span>r 2?<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo8'><![if !supportLists]><span lang=EN-US style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US style='color:#1F497D'>Is it possible to decide which resource</span><span lang=EN-US> (drbd0 or drbd1) <span style='color:#1F497D'>was primary by comparing UUIDs?</span><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> <span style='color:#1F497D'><o:p></o:p></span></span></p><p class=MsoNormal><span style='color:#1F497D'>Aprecciating your help.</span><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DE-AT'>--<br>Mit freundlichen Grüßen<br><b>Ing. Mag. </b></span><b><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DE-AT'>Horst Greifeneder<br></span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DE-AT'>(fds) <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DE-AT'> <o:p></o:p></span></p><p class=MsoNormal><b><span lang=EN-US style='font-size:7.5pt;font-family:"Arial","sans-serif";color:gray;mso-fareast-language:DE-AT'>FDS</span></b><span lang=EN-US style='font-size:7.5pt;font-family:"Arial","sans-serif";color:gray;mso-fareast-language:DE-AT'> | Forensik Data Services.</span><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DE-AT'><o:p></o:p></span></p><p class=MsoNormal><i><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:teal;mso-fareast-language:DE-AT'>Better secure than sorry!</span></i><span style='font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DE-AT'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DE-AT'> <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:gray;mso-fareast-language:DE-AT'>Schenkelbachweg 32. A - 4600 W e l s.<br>tel. 07242. 777 15. fax. 07242. 777 16.<br></span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";mso-fareast-language:DE-AT'><a href="mailto:office@fds.at"><span style='font-size:7.5pt;color:gray'>mailto:office@fds.at</span></a><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>