[Users] deduplication

Mon Jun 3 16:16:55 UTC 2013

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.

On Mon, Jun 3, 2013 at 12:12 PM, <suporte at logicworks.pt> wrote:

> Hi Juan,
>
> thanks for your info, I'll try to test FreeNAS with compression. Do you
> use it with iSCSI or NFS?
>
> Jose
>
> ------------------------------
> *From: *"Juan Jose" <jj197005 at gmail.com>
> *To: *suporte at logicworks.pt, users at ovirt.org
> *Sent: *Segunda-feira, 3 de Junho de 2013 13:37:21
> *Subject: *Re: [Users] deduplication
>
>
> 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
>>
>>
>
>
> _______________________________________________
> Users mailing list
> Users at ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users
>
>

-- 
Chris Noffsinger
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ovirt.org/pipermail/users/attachments/20130603/8870bec7/attachment-0001.html>