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</o:shapelayout></xml><![endif]--></head><body lang=FR link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'>Are you using iSCSI to access your volumes ? Might worth it activating iSCSI digests on both sides and see how it behaves then, wouldn’t it ? You’d probably lose some perfs but it would probably too help you identify the root cause of your problems I guess…<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'>Regards,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'>Pascal.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>De :</span></b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> drbd-user-bounces@lists.linbit.com [mailto:drbd-user-bounces@lists.linbit.com] <b>De la part de</b> Stanislav German-Evtushenko<br><b>Envoyé :</b> lundi 27 janvier 2014 13:51<br><b>À :</b> Bram Matthys<br><b>Cc :</b> drbd-user<br><b>Objet :</b> Re: [DRBD-user] BUG: Uncatchable DRBD out-of-sync issue<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>On Mon, Jan 27, 2014 at 4:18 PM, Bram Matthys <<a href="mailto:syzop@vulnscan.org" target="_blank">syzop@vulnscan.org</a>> wrote:<o:p></o:p></p><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm'><p class=MsoNormal>-----BEGIN PGP SIGNED MESSAGE-----<br>Hash: SHA256<br><br>Hi,<br><br>Just jumping in, unaware of the history of this thread...<br><br>Stanislav German-Evtushenko wrote, on 27-1-2014 7:08:<o:p></o:p></p><div><p class=MsoNormal>><br>> On Thu, Apr 18, 2013 at 4:21 PM, Stanislav German-Evtushenko<o:p></o:p></p></div><div><p class=MsoNormal>> <<a href="mailto:ginermail@gmail.com">ginermail@gmail.com</a> <mailto:<a href="mailto:ginermail@gmail.com">ginermail@gmail.com</a>>> wrote:<br>><br>> No choice so far :)<br>> <a href="http://pve.proxmox.com/wiki/Roadmap#Proxmox_VE_2.3" target="_blank">http://pve.proxmox.com/wiki/Roadmap#Proxmox_VE_2.3</a><br>><br>> I don't think this is a kernel bug. Anyway would be nice if sombody<br>> can investigate and fix or at least find work around. IDE is slow in<br>> compare to VIRTIO.<br>><br>> On Thu, Apr 18, 2013 at 2:31 PM, Felix Frank <<a href="mailto:ff@mpexnet.de">ff@mpexnet.de</a><o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'>> <mailto:<a href="mailto:ff@mpexnet.de">ff@mpexnet.de</a>>> wrote:<br>> > On 04/18/2013 12:20 PM, Stanislav German-Evtushenko wrote:<br>> >>> Note that your kernel (and hence kvm/virtio) can be considered<br>> rather old by now.<br>> >> This is a stable RHEL 6 kernel at the moment.<br>> ><br>> > Exactly ;-)<br>> ><br>> > Same for Debian 6, which I no longer consider fit for KVM setups<br>> > (without backports and such).<br>><br>><br>> I have replaced all hard-drives on the first server and upgraded DRBD kernel<br>> modules to 8.3.15. I do verifying every week. It usually founds new<br>> out-of-sync sectors, then I check if they are false-positive or not (with<br>> md5sum) and find that 95% of them are real.<br>> Could anybody suggest a way to debug? Can it be DRBD + RAID problem? Or DRBD<br>> + one specific RAID problem?<o:p></o:p></p></div><p class=MsoNormal>Have you figured out on which one of the servers the data is correct? And is<br>it always the same server? This assumes a primary/secondary setup.<br>If you know on which server the data is correct then you know - IF it's a<br>hardware problem - which server is at fault. If it's a software problem,<br>then you still can't tell.<br><br>Do you run a weekly/monthly RAID verification job? On both servers? Linux sw<br>raid has this, and presumably hw raid has this option as well.<br>This would pick up (most) RAID / disk issues.<br>Silent disk corruption on RAID arrays can occur and disk verification would<br>be the only way to tell (well, apart from using a filesystem like ZFS).<br><br>Good luck,<br><br>Bram.<br><br><br>- --<br>Bram Matthys<br>Software developer/IT consultant <a href="mailto:syzop@vulnscan.org">syzop@vulnscan.org</a><br>Website: <a href="http://www.vulnscan.org" target="_blank">www.vulnscan.org</a><br>PGP key: <a href="http://www.vulnscan.org/pubkey.asc" target="_blank">www.vulnscan.org/pubkey.asc</a><br>PGP fp: EBCA 8977 FCA6 0AB0 6EDB 04A7 6E67 6D45 7FE1 99A6<br>-----BEGIN PGP SIGNATURE-----<br>Version: GnuPG v2.0.17 (MingW32)<br><br>iF4EAREIAAYFAlLmToAACgkQbmdtRX/hmabbewD9HEaFbFw1j91AgDiAbgWcDari<br>qZ/fYOYBw/qyMMempbMA/iCKM5Y2Oa3XAUApPWc05cTZ+W9FyOGdOmNgIl4FMGE0<br>=z7Jn<br>-----END PGP SIGNATURE-----<br>_______________________________________________<br>drbd-user mailing list<br><a href="mailto:drbd-user@lists.linbit.com">drbd-user@lists.linbit.com</a><br><a href="http://lists.linbit.com/mailman/listinfo/drbd-user" target="_blank">http://lists.linbit.com/mailman/listinfo/drbd-user</a><o:p></o:p></p></blockquote></div><p class=MsoNormal><br><br>> Have you figured out on which one of the servers the data is correct?<br>> And is it always the same server?<br>It depends on what server is writing. On the one which write it is always correct.<br>Servers are identical and firmwares are up to date.<o:p></o:p></p><div><p class=MsoNormal><br>> Do you run a weekly/monthly RAID verification job? On both servers?<o:p></o:p></p></div><div><p class=MsoNormal>That is nice point to try. I've been thinking I'd tried everything already.<o:p></o:p></p></div><div><p class=MsoNormal><br>> This would pick up (most) RAID / disk issues.<o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'>This is very unlikely, however I'll try to run RAID verification job on both and will come back with results.<o:p></o:p></p></div><p class=MsoNormal>Stanislav<o:p></o:p></p></div></div></div>
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