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mån 2013-06-03 klockan 18:26 +0100 skrev suporte@logicworks.pt:
<blockquote type="CITE"><font color="#000000">If we have a hardware RAID controller will we need RAID-Z ?</font><br>
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Find a way of turning that fancy RAID controller into just a "bumb" HBA and send all of disks as JBOD to the OS. ZFS is designed for that purpose. If you can´t do that, buy a cheap SAS controller instead, alternatively make RAID0 volumes for each disk connected
to the RAID controller, but I´ve had issues with disks dying that needs the machine to reboot for it to realize that you´ve replaced the disk. Especially HP servers are the one´s controllers that´s been like that.<br>
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/Karli<br>
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<font color="#000000">Jose</font><br>
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<blockquote type="CITE"><b><font color="#000000">From: </font></b><font color="#000000">"Chris Noffsinger" <cnoffsin@gmail.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">"Juan Jose" <jj197005@gmail.com>, users@ovirt.org</font><br>
<b><font color="#000000">Sent: </font></b><font color="#000000">Segunda-feira, 3 de Junho de 2013 17:16:55</font><br>
<b><font color="#000000">Subject: </font></b><font color="#000000">Re: [Users] deduplication</font><br>
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<font color="#000000">Just wanted to add that Freenas is great. I use it with NFS and ISCSI and it works well. What I will say, on the HP DNS-320 I have in it I have had to go to the command prompt to fix some multipathing issues when I first add a disk but
I beleive that is just a product of the cciss controller driver in that server.</font><br>
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<blockquote type="CITE"><font color="#000000">On Mon, Jun 3, 2013 at 12:12 PM, <<a href="mailto:suporte@logicworks.pt">suporte@logicworks.pt</a>> wrote:</font>
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<blockquote><font color="#000000">Hi Juan,</font><br>
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<font color="#000000">thanks for your info, I'll try to test FreeNAS with compression. Do you use it with iSCSI or NFS?</font><br>
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<font color="#000000">Jose</font><br>
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<blockquote><b><font color="#000000">From: </font></b><font color="#000000">"Juan Jose" <<a href="mailto:jj197005@gmail.com">jj197005@gmail.com</a>></font><br>
<b><font color="#000000">To: </font></b><font color="#000000"><a href="mailto:suporte@logicworks.pt">suporte@logicworks.pt</a>,
<a href="mailto:users@ovirt.org">users@ovirt.org</a></font><br>
<b><font color="#000000">Sent: </font></b><font color="#000000">Segunda-feira, 3 de Junho de 2013 13:37:21</font><br>
<b><font color="#000000">Subject: </font></b><font color="#000000">Re: [Users] deduplication</font><br>
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<blockquote><font color="#000000">Hello Jose,</font> </blockquote>
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<blockquote><font color="#000000">We also have FreeNAS working in our infraestructure, with about 3 TB and ZFS. Some of the pools has compression enabled and you can save space with it. We have this FreeNAS connected to a hypervisor Xen and it works very well
and it's stable and sure. We have nine virtual servers some wirtualized and other paravirtualized, and some Windows Server machine all about 2 years in production without any problem. My idea is connect this infrastructure with oVirt wo be able to have some
resources for test VMs in that. Only wanted to share as another FreeNas success experience.</font>
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<blockquote><font color="#000000">Juanjo.</font> </blockquote>
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<blockquote><font color="#000000">On Fri, May 31, 2013 at 12:33 PM, <<a href="mailto:suporte@logicworks.pt">suporte@logicworks.pt</a>> wrote:</font>
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<blockquote><font color="#000000">Thanks a lot Karli, you make my mind clear about deduplication, once again we cannot have the best of both worlds.</font><br>
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<font color="#000000">I'll try FreeNAS despite my poor knowledge on FreeBSD. Openfiler, running on Linux, has no better performance but supports DRDB.</font><br>
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<font color="#000000">Jose</font><br>
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<blockquote><b><font color="#000000">From: </font></b><font color="#000000">"Karli Sjöberg" <<a href="mailto:Karli.Sjoberg@slu.se">Karli.Sjoberg@slu.se</a>></font><br>
<b><font color="#000000">To: </font></b><font color="#000000"><a href="mailto:suporte@logicworks.pt">suporte@logicworks.pt</a></font><br>
<b><font color="#000000">Cc: </font></b><font color="#000000">"Jiri Belka" <<a href="mailto:jbelka@redhat.com">jbelka@redhat.com</a>>,
<a href="mailto:users@ovirt.org">users@ovirt.org</a></font><br>
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<blockquote><b><font color="#000000">Sent: </font></b><font color="#000000">Sexta-feira, 31 de Maio de 2013 10:45:41</font><br>
<b><font color="#000000">Subject: </font></b><font color="#000000">Re: [Users] deduplication</font>
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<font color="#000000">fre 2013-05-31 klockan 09:50 +0100 skrev <a href="mailto:suporte@logicworks.pt">
suporte@logicworks.pt</a>: </font><br>
<blockquote><font color="#000000">So, we can say that dedup has more disadvantages than advantages.</font><br>
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<font color="#000000">For a primary system; most definitely, yes.</font><br>
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<font color="#000000">But for a backup system, that has tons of RAM and SSD's for cache, and you have lots of virtual machines that are based off of the template, or are very much the same, then you have a real use-case. I´m active at the FreeBSD forums where
one person reports storing 150TB of data in only 30TB of physical disk. The best practice of scrubbing is once a week on "enterprise" systems, though he is only able to do it once a month, because that´s how long it takes for a scrub to complete in that system.
So you´ve got to choose performance or savings, you can´t have both.</font><br>
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<font color="#000000">And what about dedup of Netapp?</font><br>
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<font color="#000000">Much better implementation, in my opinion. You are able schedule dedup-runs to go at night so your user´s performance isn´t impacted, and you get the savings. The question is if you value the savings enough to take on price-tag that is
NetApp. Or just build your own FreeBSD/ZFS server with compression enabled and buy in standard HDD's from anywhere... We did;)</font><br>
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<font color="#000000">/Karli</font><br>
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<font color="#000000">Jose</font><br>
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<b><font color="#000000">From: </font></b><font color="#000000">"Karli Sjöberg" <<a href="mailto:Karli.Sjoberg@slu.se">Karli.Sjoberg@slu.se</a>></font><br>
<b><font color="#000000">To: </font></b><font color="#000000"><a href="mailto:suporte@logicworks.pt">suporte@logicworks.pt</a></font><br>
<b><font color="#000000">Cc: </font></b><font color="#000000">"Jiri Belka" <<a href="mailto:jbelka@redhat.com">jbelka@redhat.com</a>>,
<a href="mailto:users@ovirt.org">users@ovirt.org</a></font><br>
<b><font color="#000000">Sent: </font></b><font color="#000000">Quinta-feira, 30 de Maio de 2013 8:33:19</font><br>
<b><font color="#000000">Subject: </font></b><font color="#000000">Re: [Users] deduplication</font><br>
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<font color="#000000">ons 2013-05-29 klockan 09:59 +0100 skrev <a href="mailto:suporte@logicworks.pt">
suporte@logicworks.pt</a>:</font><br>
<blockquote><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>
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<font color="#000000">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</font><font color="#000000"><b>may</b></font><font color="#000000">
increase performance when you have a very suitable usecase, e.g. everything</font><font color="#000000"><b>exactly</b></font><font color="#000000"> 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.</font><br>
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<font color="#000000">/Karli</font><br>
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<font color="#000000">Jose</font><br>
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<b><font color="#000000">From: </font></b><font color="#000000">"Jiri Belka" <<a href="mailto:jbelka@redhat.com">jbelka@redhat.com</a>></font><br>
<b><font color="#000000">To: </font></b><font color="#000000"><a href="mailto:suporte@logicworks.pt">suporte@logicworks.pt</a></font><br>
<b><font color="#000000">Cc: </font></b><font color="#000000"><a href="mailto:users@ovirt.org">users@ovirt.org</a></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>
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<font color="#000000">On Tue, 28 May 2013 14:29:05 +0100 (WEST)</font><br>
<font color="#000000"><a href="mailto:suporte@logicworks.pt">suporte@logicworks.pt</a> wrote:</font><br>
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<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>
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<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>
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<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>
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<font color="#000000">j.</font><br>
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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: <a href="tel:%2B46-%280%2918-67%2015%2066">+46-(0)18-67 15 66</a><br>
<a href="mailto:karli.sjoberg@adm.slu.se">karli.sjoberg@slu.se</a> </td>
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-------------------------------------------------------------------------------<br>
Karli Sjöberg<br>
Swedish University of Agricultural Sciences<br>
Box 7079 (Visiting Address Kronåsvägen 8)<br>
S-750 07 Uppsala, Sweden<br>
Phone: <a href="tel:%2B46-%280%2918-67%2015%2066">+46-(0)18-67 15 66</a><br>
<a href="mailto:karli.sjoberg@adm.slu.se">karli.sjoberg@slu.se</a> </td>
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<blockquote type="CITE"><font color="#000000">-- </font><br>
<font color="#000000">Chris Noffsinger</font><br>
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-------------------------------------------------------------------------------<br>
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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>
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