<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:m="http://schemas.microsoft.com/office/2004/12/omml" 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 14 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p.MsoAcetate, li.MsoAcetate, div.MsoAcetate
{mso-style-priority:99;
mso-style-link:"Balloon Text Char";
margin:0in;
margin-bottom:.0001pt;
font-size:8.0pt;
font-family:"Tahoma","sans-serif";}
span.BalloonTextChar
{mso-style-name:"Balloon Text Char";
mso-style-priority:99;
mso-style-link:"Balloon Text";
font-family:"Tahoma","sans-serif";}
span.EmailStyle19
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.EmailStyle20
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#1F497D;}
span.EmailStyle21
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.25in 1.0in 1.25in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="EN-US" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoNormal"><span style="color:#1F497D">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">It depends on the number of files and typical sizes. We ended up re-organizing them as larger entities on Gluster.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I believe there used to be a Gluster BDB translator for small files but it is no longer an option - you can try to have a similar setup.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><a href="http://gluster.org/community/documentation/index.php/Translators/storage/bdb">http://gluster.org/community/documentation/index.php/Translators/storage/bdb</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Ceph has LevelDB support released – the size of the “small” objects plays a key role in overall performance.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><a href="http://stackoverflow.com/questions/21726728/the-optimum-size-of-objects-in-ceph-object-storage-rados">http://stackoverflow.com/questions/21726728/the-optimum-size-of-objects-in-ceph-object-storage-rados</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">If you find a specific setting in gluster that makes a huge difference for tackling the small files please do share.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Regards<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Nirmal<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> gluster-users-bounces@gluster.org [mailto:gluster-users-bounces@gluster.org]
<b>On Behalf Of </b>Jocelyn Hotte<br>
<b>Sent:</b> Thursday, July 10, 2014 8:42 AM<br>
<b>To:</b> gluster-users@gluster.org<br>
<b>Subject:</b> Re: [Gluster-users] Tuning for small files?<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Hi, can anyone help me with this issue?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-language:FR-CA">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-language:FR-CA"> Jocelyn Hotte
<br>
<b>Sent:</b> 8 juillet 2014 11:16<br>
<b>To:</b> <a href="mailto:gluster-users@gluster.org">gluster-users@gluster.org</a><br>
<b>Subject:</b> Tuning for small files?<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><span lang="FR-CA"><o:p> </o:p></span></p>
<p class="MsoNormal">Hello Gluster Community,<o:p></o:p></p>
<p class="MsoNormal">I was wondering if there are some things I could do to optimize gluster for small files.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Our bricks are 4 SSD in Raid0, and we have a replica set factor of 3<o:p></o:p></p>
<p class="MsoNormal"><span lang="FR-CA"><o:p> </o:p></span></p>
<p class="MsoNormal">We have a use-case where we would like to optimize our gluster mount for small files (about 6kb).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Here’s my current benchmarks on my mount<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"># 1mb block size on RAID0 SSD<o:p></o:p></p>
<p class="MsoNormal">dd if=/dev/zero of=/ssd/test_ssd_1mb bs=1M count=100<o:p></o:p></p>
<p class="MsoNormal">100+0 records in<o:p></o:p></p>
<p class="MsoNormal">100+0 records out<o:p></o:p></p>
<p class="MsoNormal">104857600 bytes (105 MB) copied, 0.0577655 s, 1.8 GB/s<o:p></o:p></p>
<p class="MsoNormal"><span lang="FR-CA"><o:p> </o:p></span></p>
<p class="MsoNormal"># 1kb block size on RAID0 SSD<o:p></o:p></p>
<p class="MsoNormal">dd if=/dev/zero of=/ssd/test_ssd_1kb bs=1K count=100000<o:p></o:p></p>
<p class="MsoNormal"><span lang="FR-CA">100000+0 records in<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-CA">100000+0 records out<o:p></o:p></span></p>
<p class="MsoNormal">102400000 bytes (102 MB) copied, 0.181732 s, 563 MB/s<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"># 1mb block size on Gluster mount<o:p></o:p></p>
<p class="MsoNormal">dd if=/dev/zero of=/gluster/test_gluster_1mb bs=1M count=100<o:p></o:p></p>
<p class="MsoNormal">100+0 records in<o:p></o:p></p>
<p class="MsoNormal">100+0 records out<o:p></o:p></p>
<p class="MsoNormal">104857600 bytes (105 MB) copied, 0.219619 s, 477 MB/s<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"># 1kb block size on Gluster mount<o:p></o:p></p>
<p class="MsoNormal">dd if=/dev/zero of=/gluster/test_gluster_1kb bs=1K count=100000<o:p></o:p></p>
<p class="MsoNormal">100000+0 records in<o:p></o:p></p>
<p class="MsoNormal">100000+0 records out<o:p></o:p></p>
<p class="MsoNormal">102400000 bytes (102 MB) copied, 6.73986 s, 15.2 MB/s<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">As you can see, our performances on small block size are very low.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We’re running glusterfs 3.4.2, with the following options:<o:p></o:p></p>
<p class="MsoNormal">diagnostics.count-fop-hits: on<o:p></o:p></p>
<p class="MsoNormal">diagnostics.latency-measurement: off<o:p></o:p></p>
<p class="MsoNormal">performance.cache-max-file-size: 64KB<o:p></o:p></p>
<p class="MsoNormal">performance.write-behind-window-size: 8MB<o:p></o:p></p>
<p class="MsoNormal">performance.cache-size: 2GB<o:p></o:p></p>
<p class="MsoNormal">performance.io-thread-count: 64<o:p></o:p></p>
<p class="MsoNormal">performance.flush-behind: off<o:p></o:p></p>
<p class="MsoNormal">performance.io-cache: on<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thank you for your help<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Jocelyn Hotte<o:p></o:p></p>
<p class="MsoNormal">Tools Programmer, Ubisoft<o:p></o:p></p>
</div>
</body>
</html>