[Users] deduplication

[Juan Jose]

Hello Jose,

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.

Juanjo.


On Fri, May 31, 2013 at 12:33 PM, <suporte at logicworks.pt> wrote:

> Thanks a lot Karli, you make my mind clear about deduplication, once again
> we cannot have the best of both worlds.
>
> I'll try FreeNAS despite my poor knowledge on FreeBSD. Openfiler, running
> on Linux, has no better performance but supports DRDB.
>
> Jose
>
> ------------------------------
> *From: *"Karli Sjöberg" <Karli.Sjoberg at slu.se>
> *To: *suporte at logicworks.pt
> *Cc: *"Jiri Belka" <jbelka at redhat.com>, users at ovirt.org
> *Sent: *Sexta-feira, 31 de Maio de 2013 10:45:41
> *Subject: *Re: [Users] deduplication
>
>
> fre 2013-05-31 klockan 09:50 +0100 skrev suporte at logicworks.pt:
>
> So, we can say that dedup has more disadvantages than advantages.
>
>
> For a primary system; most definitely, yes.
>
> 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.
>
>
> And what about dedup of Netapp?
>
>
> 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;)
>
> /Karli
>
>
> Jose
>
> ------------------------------
>
> *From: *"Karli Sjöberg" <Karli.Sjoberg at slu.se>
> *To: *suporte at logicworks.pt
> *Cc: *"Jiri Belka" <jbelka at redhat.com>, users at ovirt.org
> *Sent: *Quinta-feira, 30 de Maio de 2013 8:33:19
> *Subject: *Re: [Users] deduplication
>
> ons 2013-05-29 klockan 09:59 +0100 skrev suporte at logicworks.pt:
>
> 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.
> Any way, I think another solution for dedup is FreeNAS using ZFS.
>
>
> 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 *may* increase performance
> when you have a very suitable usecase, e.g. everything *exactly* 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.
>
> /Karli
>
>
> Jose
>
>
> ------------------------------
>
> *From: *"Jiri Belka" <jbelka at redhat.com>
> *To: *suporte at logicworks.pt
> *Cc: *users at ovirt.org
> *Sent: *Quarta-feira, 29 de Maio de 2013 7:33:10
> *Subject: *Re: [Users] deduplication
>
> On Tue, 28 May 2013 14:29:05 +0100 (WEST)
> suporte at logicworks.pt wrote:
>
> > That's why I'm making this questions, to demystify some buzzwords around
> here.
> > But if you have a strong and good technology why not create buzzwords to
> get into as many people as possible? without trapped them.
> > Share a disk containing "static" data is a good idea, do you know from
> where I can start?
>
> Everything depends on your needs, design planning. Maybe then sharing
> disk would be better to share via NFS/iscsi. Of course if you have many
> VMs each of them is different you will fail. But if you have mostly
> homogeneous environment you can think about this approach. Sure you have
> to have plan for upgrading "base" "static" shared OS data, you have to
> have plan how to install additional software (different destination
> than /usr or /usr/local)... If you already have your own build host
> which builds for you OS packages and you have already your own plan for
> deployment, you have done first steps. If you depend on upgrading each
> machine separately from Internet, then first you should plan your
> environment, configuration management etc.
>
> Well, in many times people do not do any planning, they just think some
> good technology would save their "poor" design.
>
> j.
>
>
>
>
>   --
>
> Med Vänliga Hälsningar
>
> -------------------------------------------------------------------------------
> Karli Sjöberg
> Swedish University of Agricultural Sciences
> Box 7079 (Visiting Address Kronåsvägen 8)
> S-750 07 Uppsala, Sweden
> Phone:  +46-(0)18-67 15 66
> karli.sjoberg at slu.se <karli.sjoberg at adm.slu.se>
>
>
>
>
>   --
>
> Med Vänliga Hälsningar
>
> -------------------------------------------------------------------------------
> Karli Sjöberg
> Swedish University of Agricultural Sciences
> Box 7079 (Visiting Address Kronåsvägen 8)
> S-750 07 Uppsala, Sweden
> Phone:  +46-(0)18-67 15 66
> karli.sjoberg at slu.se <karli.sjoberg at adm.slu.se>
>
>
> _______________________________________________
> Users mailing list
> Users at ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ovirt.org/pipermail/users/attachments/20130603/61be0dbf/attachment.html>