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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>dmesg | grep sr1 should show you all you need to know.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Dan (there’s that word “should” again<g>)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='margin-left:.5in'><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>Andrew Eross<br><b>Sent:</b> Friday, October 05, 2012 2:17 PM<br><b>To:</b> drbd-user@lists.linbit.com<br><b>Subject:</b> [DRBD-user] IO Error Logging<o:p></o:p></span></p><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p><p class=MsoNormal style='margin-left:.5in'>Hi guys,<o:p></o:p></p><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>I'm trying to debug a SSD drive that's the backing device for my secondary node.<o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>The primary/secondary are sync'd (protocol C) and everything goes fine until I get to testing fail-over, e.g.on the primary "drbdadm secondary drbd-sr1", and on the secondary "drbdadm primary drbd-sr1".<o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>When I do this the secondary locks up for about 5 minutes (SSH session drops) then it starts responding again and I see drbd has now dropped into diskless mode.<o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>I'm thinking there might be IO errors occurring with the underlying disk and perhaps drbd is automatically detaching it.<o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>Right now I'm running badblocks on the backing device and seeing if it can find any problems.<o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>In the meantime I've been trying to figure out how to get more information about IO errors from drbd.<o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>My devices are configured with "detach" as recommended (<a href="http://www.drbd.org/users-guide/s-configure-io-error-behavior.html">http://www.drbd.org/users-guide/s-configure-io-error-behavior.html</a>), however, I'm not sure how to find out more information about when this event occurs.<o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>Are there any debugging options I can enable that would help me see IO error details that caused a detach? <o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>Thanks!<o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'>Andrew<o:p></o:p></p></div><div><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p></div></div></body></html>