<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:p="urn:schemas-microsoft-com:office:powerpoint" xmlns:a="urn:schemas-microsoft-com:office:access" xmlns:dt="uuid:C2F41010-65B3-11d1-A29F-00AA00C14882" xmlns:s="uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882" xmlns:rs="urn:schemas-microsoft-com:rowset" xmlns:z="#RowsetSchema" xmlns:b="urn:schemas-microsoft-com:office:publisher" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:c="urn:schemas-microsoft-com:office:component:spreadsheet" xmlns:odc="urn:schemas-microsoft-com:office:odc" xmlns:oa="urn:schemas-microsoft-com:office:activation" xmlns:html="http://www.w3.org/TR/REC-html40" xmlns:q="http://schemas.xmlsoap.org/soap/envelope/" xmlns:rtc="http://microsoft.com/officenet/conferencing" xmlns:D="DAV:" xmlns:Repl="http://schemas.microsoft.com/repl/" xmlns:mt="http://schemas.microsoft.com/sharepoint/soap/meetings/" xmlns:x2="http://schemas.microsoft.com/office/excel/2003/xml" xmlns:ppda="http://www.passport.com/NameSpace.xsd" xmlns:ois="http://schemas.microsoft.com/sharepoint/soap/ois/" xmlns:dir="http://schemas.microsoft.com/sharepoint/soap/directory/" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:dsp="http://schemas.microsoft.com/sharepoint/dsp" xmlns:udc="http://schemas.microsoft.com/data/udc" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:sub="http://schemas.microsoft.com/sharepoint/soap/2002/1/alerts/" xmlns:ec="http://www.w3.org/2001/04/xmlenc#" xmlns:sp="http://schemas.microsoft.com/sharepoint/" xmlns:sps="http://schemas.microsoft.com/sharepoint/soap/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:udcs="http://schemas.microsoft.com/data/udc/soap" xmlns:udcxf="http://schemas.microsoft.com/data/udc/xmlfile" xmlns:udcp2p="http://schemas.microsoft.com/data/udc/parttopart" xmlns:wf="http://schemas.microsoft.com/sharepoint/soap/workflow/" xmlns:dsss="http://schemas.microsoft.com/office/2006/digsig-setup" xmlns:dssi="http://schemas.microsoft.com/office/2006/digsig" xmlns:mdssi="http://schemas.openxmlformats.org/package/2006/digital-signature" xmlns:mver="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns:mrels="http://schemas.openxmlformats.org/package/2006/relationships" xmlns:spwp="http://microsoft.com/sharepoint/webpartpages" xmlns:ex12t="http://schemas.microsoft.com/exchange/services/2006/types" xmlns:ex12m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:pptsl="http://schemas.microsoft.com/sharepoint/soap/SlideLibrary/" xmlns:spsl="http://microsoft.com/webservices/SharePointPortalServer/PublishedLinksService" xmlns:Z="urn:schemas-microsoft-com:" xmlns:st="" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hello,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I just setup two test DRBD boxes connecting over my WAN running drbd 8.3.10. I am seeing poor write performance during testing and would appreciate any help.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I am using protocol A. My WAN circuit is capable of sustained 35+ Mb/s throughput and about 12ms RTT latency. I was hoping this would be enough for decent primary performance.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I understand that writes will be slowed down on the primary node until the send buffer is cleared during heavy writes, so I would like any help with this setting. I am also interested in the ahead/behind mode but am unsure how to enable it properly. I have included my recent drbd.conf, I am testing with it now. If anyone has any tips, thank you in advance.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>global {<o:p></o:p></p><p class=MsoNormal> usage-count ask;<o:p></o:p></p><p class=MsoNormal>}<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>common {<o:p></o:p></p><p class=MsoNormal> syncer { rate 10M; }<o:p></o:p></p><p class=MsoNormal>}<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>resource vg0_drbd {<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal> protocol A;<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal> handlers {<o:p></o:p></p><p class=MsoNormal> pri-on-incon-degr "echo O > /proc/sysrq-trigger ; halt -f";<o:p></o:p></p><p class=MsoNormal> pri-lost-after-sb "echo O > /proc/sysrq-trigger ; halt -f";<o:p></o:p></p><p class=MsoNormal> local-io-error "echo O > /proc/sysrq-trigger ; halt -f";<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal> }<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal> startup {<o:p></o:p></p><p class=MsoNormal> degr-wfc-timeout 120; # 2 minutes.<o:p></o:p></p><p class=MsoNormal> }<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal> disk {<o:p></o:p></p><p class=MsoNormal> on-io-error detach;<o:p></o:p></p><p class=MsoNormal> no-disk-barrier;<o:p></o:p></p><p class=MsoNormal> no-disk-flushes;<o:p></o:p></p><p class=MsoNormal> no-md-flushes;<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal> }<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>net {<o:p></o:p></p><p class=MsoNormal> max-buffers 2048;<o:p></o:p></p><p class=MsoNormal> max-epoch-size 2048;<o:p></o:p></p><p class=MsoNormal> unplug-watermark 2048;<o:p></o:p></p><p class=MsoNormal> sndbuf-size 0;<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal> }<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal> syncer {<o:p></o:p></p><p class=MsoNormal> al-extents 3389;<o:p></o:p></p><p class=MsoNormal> }<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal> on node01 {<o:p></o:p></p><p class=MsoNormal> device /dev/drbd0;<o:p></o:p></p><p class=MsoNormal> disk /dev/sdb;<o:p></o:p></p><p class=MsoNormal> address 172.18.10.50:7788;<o:p></o:p></p><p class=MsoNormal> meta-disk internal;<o:p></o:p></p><p class=MsoNormal> }<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal> on node02 {<o:p></o:p></p><p class=MsoNormal> device /dev/drbd0;<o:p></o:p></p><p class=MsoNormal> disk /dev/sdb;<o:p></o:p></p><p class=MsoNormal> address 172.19.10.50:7788;<o:p></o:p></p><p class=MsoNormal> meta-disk internal;<o:p></o:p></p><p class=MsoNormal> }<o:p></o:p></p><p class=MsoNormal>}<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><b><span style='font-family:"Arial","sans-serif"'>Thanks, <o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-family:"Arial","sans-serif"'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-family:"Arial","sans-serif"'>Sean</span></b><span style='font-family:"Arial","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>