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<p class="MsoNormal">Hi all,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">I am just setting up a nexenta storage (community edition) and try to use multipath on the proxmox side:<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"># multipath -l<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">mpath1 (3600144f0001e58febc44503399600001) dm-3 NEXENTA,NEXENTASTOR<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">size=100G features='1 queue_if_no_path' hwhandler='0' wp=rw<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">`-+- policy='round-robin 0' prio=-3 status=active<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> |- 5:0:0:0 sdd 8:48 active undef running<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> |- 3:0:0:0 sdb 8:16 active undef running<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> `- 4:0:0:0 sdc 8:32 active undef running<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 assume above output is OK so far.<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 strange thing is that we get very poor performance. When I test a<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">single iscsi drive I get:<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"># hdparm -t /dev/sdc<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">/dev/sdc:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Timing buffered disk reads: 338 MB in 3.00 seconds = 112.48 MB/sec<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">root@dell1:~# hdparm -t /dev/sdb<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">/dev/sdb:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Timing buffered disk reads: 222 MB in 3.01 seconds = 73.69 MB/sec<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">root@dell1:~# hdparm -t /dev/sdd<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">/dev/sdd:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Timing buffered disk reads: 262 MB in 3.01 seconds = 87.07 MB/sec<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">When I test the multipath drive I get:<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"># hdparm -t /dev/mapper/mpath1 <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">/dev/mapper/mpath1:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Timing buffered disk reads: 266 MB in 3.02 seconds = 88.04 MB/sec<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 there is no speed gain. I already checked that traffic is routed to different network cards.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Any idea why it is that slow?<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">- Dietmar<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>
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