<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div dir="ltr" id="yui_3_16_0_1_1423726434056_8934"><span id="yui_3_16_0_1_1423726434056_9968">Thanks Pranith for the details. So with that option one would be trading data consistency with performance. I am now interested to hear about Nico's new tests with this option disabled...</span></div> <div class="qtdSeparateBR"><br><br></div><div style="display: block;" class="yahoo_quoted"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"> <font size="2" face="Arial"> On Thursday, February 12, 2015 9:23 AM, Pranith Kumar Karampuri <pkarampu@redhat.com> wrote:<br> </font> </div> <br><br> <div class="y_msg_container"><div id="yiv4422645265"><div>
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<div class="yiv4422645265moz-cite-prefix">On 02/12/2015 01:17 PM, ML mail wrote:<br clear="none">
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<div dir="ltr" id="yiv4422645265yui_3_16_0_1_1423726434056_5540"><span>Dear
Pranith</span></div>
<div dir="ltr"><br clear="none">
<span></span></div>
<div dir="ltr" id="yiv4422645265yui_3_16_0_1_1423726434056_5724"><span id="yiv4422645265yui_3_16_0_1_1423726434056_5725">I would be interested
to know what the cluster.ensure-durability off option does,
could you explain or point to the documentation?</span></div>
</div>
</blockquote>
By default replication translator does fsyncs on the files at
certain times so that it doesn't lose data when the filesystem
crashes and changelogs that afr stores are corrupted. This is
introduced from 3.5.x on wards.<br clear="none">
<br clear="none">
Pranith<br clear="none">
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<span id="yiv4422645265yui_3_16_0_1_1423726434056_5725"></span></div>
<div dir="ltr" id="yiv4422645265yui_3_16_0_1_1423726434056_5728"><span id="yiv4422645265yui_3_16_0_1_1423726434056_5725">Regards</span></div>
<div dir="ltr" id="yiv4422645265yui_3_16_0_1_1423726434056_5729"><span id="yiv4422645265yui_3_16_0_1_1423726434056_5725">ML</span></div>
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<div dir="ltr"> <font size="2" face="Arial"> On Thursday,
February 12, 2015 8:24 AM, Pranith Kumar Karampuri
<a rel="nofollow" shape="rect" class="yiv4422645265moz-txt-link-rfc2396E" ymailto="mailto:pkarampu@redhat.com" target="_blank" href="mailto:pkarampu@redhat.com"><pkarampu@redhat.com></a> wrote:<br clear="none">
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On 02/12/2015 04:37 AM, Nico Schottelius wrote:<br clear="none">
> Hello,<br clear="none">
><br clear="none">
> switching from 3.4.2 to 3.6.2 reduces our average
test performance dramatically.<br clear="none">
><br clear="none">
> Our test setup: directly connected 1 GBit/s hosts
setup with:<br clear="none">
><br clear="none">
> rm -rf /home/gluster/.glusterfs/<br clear="none">
> rm /home/gluster/*<br clear="none">
> setfattr -x trusted.glusterfs.volume-id
/home/gluster/<br clear="none">
> setfattr -x trusted.gfid /home/gluster/<br clear="none">
> gluster volume create xfs-plain replica 2
transport tcp vmhost1-cluster1:/home/gluster
vmhost2-cluster1:/home/gluster<br clear="none">
> gluster volume start xfs-plain<br clear="none">
><br clear="none">
> Afterwards we run our near real world test<br clear="none">
><br clear="none">
> mount -t glusterfs vmhost1-cluster1:/xfs-plain
/mnt/gluster/<br clear="none">
> while true; do dd
if=redmine-from-ceph-20150204 of=/mnt/gluster/testvm
bs=1M; rm /mnt/gluster/testvm; done<br clear="none">
><br clear="none">
> The results are<br clear="none">
><br clear="none">
> 3.4.2: ~71-72 MiB/s [ubuntu 14.04]<br clear="none">
> 3.6.2: ~59-64 MiB/s [gluster-3.6 ppa]<br clear="none">
><br clear="none">
> We have removed 3.6.2 and re-installed 3.4.2 and
can consistently reproduce<br clear="none">
> these numbers over hours of testing.<br clear="none">
Could you repeat the test on 3.6.2 with 'volume set
<volname> <br clear="none">
cluster.ensure-durability off' option and post the
results.<br clear="none">
<br clear="none">
Pranith
<div class="yiv4422645265yqt9599502956" id="yiv4422645265yqtfd71438"><br clear="none">
><br clear="none">
> Is there any configuration change that we need to
incorporate to run<br clear="none">
> 3.6.2 faster or is this a known problem?<br clear="none">
><br clear="none">
> Cheers,<br clear="none">
><br clear="none">
> Nico<br clear="none">
><br clear="none">
<br clear="none">
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