<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<p><br>
</p>
<br>
<div class="moz-cite-prefix">Le 18/09/2017 à 20:59, Dave Cottingham
a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:CAG2bJn4VE2mchKKsvSV_YoS=x7J-eL1Xb=-9uTOQTnsURRm5Mw@mail.gmail.com">
<div dir="ltr">
<div>
<div>
<div>Ran borg create with "--chunker-params 20,24,22,4095"
and it says:<br>
<br>
borg create: error: argument --chunker-params: invalid
ChunkerParams value: '20,24,22,4095'<br>
<br>
</div>
Why is this an invalid value?<br>
</div>
</div>
</div>
</blockquote>
<br>
strange, I made the same test yesterday, and it worked<br>
<br>
<br>
here is my command line <br>
<pre>borg create -v --stats <i><b>--chunker-params 18,22,20,4095</b></i> \
<a class="moz-txt-link-abbreviated" href="mailto:borg@myserver.fr:/mnt/provigo-borg/testplus4Mchunk1M::sauve-09-18">borg@myserver.fr:/mnt/provigo-borg/testplus4Mchunk1M::sauve-09-18</a> /home/libes/Documents/testborg/</pre>
<br>
in my case I wanted to decrease the size of chunks to 1Mb (2^20)<br>
to see how much we could gain on a dataset of 137Gb (composed only
by files greater than 4Mb)<br>
<br>
the results is that we gain just a little bit : 2Gb of dedup with
chunks of 1Mb<br>
I imagined it could be more :-\<br>
<br>
what is strange is that the duration time is lesser, but not very
signiticative<br>
may be due to the server load?<br>
I would have thought that with a half chunk size , the duration time
would be longer because there was the double of chunk<br>
<br>
here below my results<br>
<br>
<pre>I/ chunks of 2Mb default</pre>
<pre>==================================</pre>
<pre>------------------------------------------------------------------------------</pre>
<pre>Archive name: sauve-09-18</pre>
<pre>Time (start): Mon, 2017-09-18 12:25:25</pre>
<pre>Time (end): Mon, 2017-09-18 15:14:17</pre>
<pre><i><b>Duration: 2 hours 48 minutes 52.60 seconds</b></i></pre>
<pre>Number of files: 2395</pre>
<pre>------------------------------------------------------------------------------</pre>
<pre> Original size Compressed size Deduplicated size</pre>
<pre>This archive: <i><b> 137.95 GB 137.95 GB 108.37 GB</b></i></pre>
<pre>All archives: 137.95 GB 137.95 GB 108.37 GB</pre>
<pre>
Unique chunks Total chunks</pre>
<pre>Chunk index: <i><b> 43245 55125</b></i></pre>
<pre>------------------------------------------------------------------------------</pre>
<pre>
II/ <i><b>chunks of 1Mb 2^20</b></i></pre>
<pre>==================================</pre>
<pre>
borg create -v --stats --chunker-params 18,22,20,4095 <a class="moz-txt-link-abbreviated" href="mailto:borg@myserver.fr">borg@myserver.fr</a>: \
/mnt/provigo-borg/testplus4Mchunk1M::sauve-09-18 /home/libes/Documents/testborg/</pre>
<pre>------------------------------------------------------------------------------</pre>
<pre>Archive name: sauve-09-18</pre>
<pre>Time (start): Mon, 2017-09-18 18:11:57</pre>
<pre>Time (end): Mon, 2017-09-18 20:56:40</pre>
<pre><i><b>Duration: 2 hours 44 minutes 42.61 seconds</b></i></pre>
<pre>Number of files: 2395</pre>
<pre>------------------------------------------------------------------------------</pre>
<pre> Original size Compressed size Deduplicated size</pre>
<pre><i><b>This archive: 137.95 GB 137.95 GB 106.94 GB</b></i></pre>
<pre>All archives: 137.95 GB 137.95 GB 106.94 GB</pre>
<pre>
Unique chunks Total chunks</pre>
<pre>Chunk index: <i><b> 83381 107820</b></i></pre>
<pre>------------------------------------------------------------------------------</pre>
<br>
<blockquote type="cite"
cite="mid:CAG2bJn4VE2mchKKsvSV_YoS=x7J-eL1Xb=-9uTOQTnsURRm5Mw@mail.gmail.com">
<div dir="ltr">
<div>
<div><br>
</div>
Thanks,<br>
</div>
Dave Cottingham<br>
<br>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
Borgbackup mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Borgbackup@python.org">Borgbackup@python.org</a>
<a class="moz-txt-link-freetext" href="https://mail.python.org/mailman/listinfo/borgbackup">https://mail.python.org/mailman/listinfo/borgbackup</a>
</pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
M. LIBES
Service Informatique OSU Pytheas - UMS 3470 CNRS
Batiment Oceanomed
Campus de Luminy
13288 Marseille cedex 9
Tel: 04860 90529 </pre>
</body>
</html>