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<p class="MsoPlainText"><span lang="EN-US">Hello,<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="color:black"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="color:black">We use the following cluster now. the postgres resource agent PAF has its own mechanism to decide which node should be promoted to master.
<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="color:black"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="color:black">But the performance test show the disk IO is the bottleneck. So we want to try to change the GFS2 resource</span><span style="font-family:等线;color:black">（</span><span lang="EN-US" style="color:black">clusterf</span><span style="font-family:等线;color:black">）</span><span lang="EN-US" style="color:black">
to be master/slave mode too which could increase the performance.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="color:black"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="color:black">So there will be two resources</span><span style="font-family:等线;color:black">（</span><span lang="EN-US" style="color:black">pgsql and gfs</span><span style="font-family:等线;color:black">）</span><span lang="EN-US" style="color:black">to
be master/slave module and we hope their master are always in the same node. If switchover happens and we hope the pgsql and gfs switchover at the same time.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="color:black"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="color:black">I am studying how to implement this configuration. Could you please give any suggestion?<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="color:black"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><img width="469" height="405" style="width:4.8854in;height:4.2187in" id="图片_x0020_7" src="cid:image001.jpg@01D3D19F.C815E640"></span><span lang="EN-US" style="color:black"><o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="color:black"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="color:black">By the way, Now we use the following method to create the clone GFS resource. Is there any way to configure to improve the share disk access performance?<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";background:#D9D9D9">pcs resource create dlm ocf:pacemaker:controld op monitor interval=30s on-fail=fence clone interleave=true ordered=true;<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";background:#D9D9D9">pcs resource create clvmd ocf:heartbeat:clvm op monitor interval=30s on-fail=fence clone interleave=true ordered=true;</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";background:#D9D9D9"><o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US" style="font-size:9.0pt;font-family:"Courier New";background:#D9D9D9">pcs resource create clusterfs Filesystem device="/dev/sdb1" directory="/home/postgres/sharedisk" fstype="gfs2" "options=noatime" op monitor interval=10s
on-fail=fence clone interleave=true;</span><span lang="EN-US" style="color:black"><o:p></o:p></span></p>
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