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</o:shapelayout></xml><![endif]--></head><body lang=FR link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span lang=EN-US>Hi mailing !<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>I have three nodes drbdmanage cluster.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Two nodes work as storage backend (S1/S2).<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>One node as satellite pure client (for future nova usage)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>I work on 20GB/s LACP network between storage backends and satellite pure client node<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>So, when I bench on local drbd on storage node with two nodes connected with :<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>dd if=/dev/zero of=/dev/drbd104 bs=1M count=512 oflag=direct<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>I have almost 680 MB/s => It is ok for me<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>After I assign the resource to the satellite node.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>I try the same thing on it :<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>dd if=/dev/zero of=/dev/drbd104 bs=1M count=512 oflag=direct<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>I get 420MB/s => why ?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>If I do the same test on satellite node and with disconnect resource on one storage backend :<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>dd if=/dev/zero of=/dev/drbd104 bs=1M count=512 oflag=direct<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>I get 650MB/s => It is ok for me<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>The 20GB network can support those two flows between storage and satellite.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>I don’t understand where is the bottleneck or misconfiguration.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>(I can read balance at 800MB/s, but I didn’t try other settings to get more)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Schema :<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US> -------------<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> -Satellite-<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> -------------<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> ||<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> --------------------<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> - Switch -<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> -------------------<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> || ||<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> ----- ------<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> -S1- -S2-<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> ----- ------<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Cfg:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Protocol C<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>al-extents 6007;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>md-flushes no;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>disk-barrier no;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>disk-flushes no;<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Others are default (good results with those)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>If you have any suggestion I will be very happy.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Thanks !<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>