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ons 2013-05-29 klockan 09:59 +0100 skrev suporte@logicworks.pt:
<blockquote type="CITE"><font color="#000000">Absolutely agree with you, planning is the best thing to do, but normally people want a plug'n'play system with all included, because there is not much time to think and planning, and there are many companies that
know how to take advantage of this people characteristics.</font><br>
<font color="#000000">Any way, I think another solution for dedup is FreeNAS using ZFS.</font><br>
</blockquote>
<br>
FreeNAS is just FreeBSD with a fancy web-ui ontop, so it´s neither more or less of ZFS than you would have otherwise, And regarding dedup in ZFS; Just don´t, it´s not worth it! It´s said that it
<b>may</b> increase performance when you have a very suitable usecase, e.g. everything
<b>exactly</b> the same over and over. What´s not said is that scrubbing and resilvering slows down to a snail (from hundreds of MB/s, or GB if your system is large enough, down to less than 10), just from dedup. Also deleting snapshots of datasets that have(or
have had) dedup on can kill the entire system, and when I say kill, I mean really fubar. Been there, regretted that... Now, compression on the other hand, you get basically for free and gives decent savings, I highly recommend that.<br>
<br>
/Karli<br>
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<blockquote type="CITE"><br>
<font color="#000000">Jose</font><br>
<br>
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<hr align="center">
</blockquote>
<blockquote type="CITE"><b><font color="#000000">From: </font></b><font color="#000000">"Jiri Belka" <jbelka@redhat.com></font><br>
<b><font color="#000000">To: </font></b><font color="#000000">suporte@logicworks.pt</font><br>
<b><font color="#000000">Cc: </font></b><font color="#000000">users@ovirt.org</font><br>
<b><font color="#000000">Sent: </font></b><font color="#000000">Quarta-feira, 29 de Maio de 2013 7:33:10</font><br>
<b><font color="#000000">Subject: </font></b><font color="#000000">Re: [Users] deduplication</font><br>
<br>
<font color="#000000">On Tue, 28 May 2013 14:29:05 +0100 (WEST)</font><br>
<font color="#000000">suporte@logicworks.pt wrote:</font><br>
<br>
<font color="#000000">> That's why I'm making this questions, to demystify some buzzwords around here.
</font><br>
<font color="#000000">> But if you have a strong and good technology why not create buzzwords to get into as many people as possible? without trapped them.
</font><br>
<font color="#000000">> Share a disk containing "static" data is a good idea, do you know from where I can start?
</font><br>
<br>
<font color="#000000">Everything depends on your needs, design planning. Maybe then sharing</font><br>
<font color="#000000">disk would be better to share via NFS/iscsi. Of course if you have many</font><br>
<font color="#000000">VMs each of them is different you will fail. But if you have mostly</font><br>
<font color="#000000">homogeneous environment you can think about this approach. Sure you have</font><br>
<font color="#000000">to have plan for upgrading "base" "static" shared OS data, you have to</font><br>
<font color="#000000">have plan how to install additional software (different destination</font><br>
<font color="#000000">than /usr or /usr/local)... If you already have your own build host</font><br>
<font color="#000000">which builds for you OS packages and you have already your own plan for</font><br>
<font color="#000000">deployment, you have done first steps. If you depend on upgrading each</font><br>
<font color="#000000">machine separately from Internet, then first you should plan your</font><br>
<font color="#000000">environment, configuration management etc.</font><br>
<br>
<font color="#000000">Well, in many times people do not do any planning, they just think some</font><br>
<font color="#000000">good technology would save their "poor" design.</font><br>
<br>
<font color="#000000">j.</font><br>
<br>
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<td>-- <br>
<br>
Med Vänliga Hälsningar<br>
-------------------------------------------------------------------------------<br>
Karli Sjöberg<br>
Swedish University of Agricultural Sciences<br>
Box 7079 (Visiting Address Kronåsvägen 8)<br>
S-750 07 Uppsala, Sweden<br>
Phone: +46-(0)18-67 15 66<br>
<a href="mailto:karli.sjoberg@adm.slu.se">karli.sjoberg@slu.se</a> </td>
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