<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>Hi,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I’m trying to use DRBD with the backend storage on a FusionIO device (NAND Flash without disk controller overhead.) I’ve found that I’m taking a huge performance hit via testing with fio.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>IOPS<o:p></o:p></p><p class=MsoNormal>`fio --directory=/fio/test --direct=1 --rw=randread --bs=4k --size=5G --numjobs=64 --runtime=10 --group_reporting --name=file1`<o:p></o:p></p><p class=MsoNormal>raw device: 104k<o:p></o:p></p><p class=MsoNormal>drbd device: 75k<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Bandwidth<o:p></o:p></p><p class=MsoNormal>`fio --directory=/fio/test --direct=1 --rw=randread --bs=1m --size=5G --numjobs=4 --runtime=100 --group_reporting --name=file1`<o:p></o:p></p><p class=MsoNormal>raw device: 750 MB/s<o:p></o:p></p><p class=MsoNormal>drbd device: 550-600 MB/s<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I’ve tried drbd 8.3.9 and 8.3.10 and while 8.3.10 might be slightly better, it’s mostly insignificant (1-2%.)<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The backend for writing is 2 x 1GB bonded round robin dedicated interfaces, but since I’m seeing a read hit I’m not concerned with this potential write bottle neck at the moment unless it’s somehow related, I plan to use 10 gig cards in the near future if this works out.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>? The DRBD process seems be CPU bound, but performance is worse if I change cpu affinity to be more than 1 core. This is on a E5430 @ 2.66GHz. I imagine a faster CPU could improve performance, but I’m looking for other suggestions of course.<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Other Relevant Details:<o:p></o:p></p><p class=MsoNormal>CentOS 5.5<o:p></o:p></p><p class=MsoNormal>Kernel 2.6.18-194<o:p></o:p></p><p class=MsoNormal>Filesystem XFS<o:p></o:p></p><p class=MsoNormal>drbd 8.3.9 and 8.3.10 compiled into rpm’s from source (any compile time tweaks I could use, such as CPU type?)<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks,<o:p></o:p></p><p class=MsoNormal>Mark<o:p></o:p></p></div><hr>
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