[ovirt-users] Hardware critique

Fri Apr 6 13:45:51 UTC 2018

Yaniv,

I appreciate your input, thanks!

I understand that everyone's use case is different, but I was hoping to
hear from some users that are using oVirt hyper-converged setup and get
some input on the performance.  When I research GlusterFS I hear a lot
about how it can be slow especially when dealing with small files.  I'm
starting to wonder if a straight up NFS server with a few SSDs would be
less hassle and perhaps offer better VM performance than glusterFS can
currently.

I want to get the best oVirt performance I can get (on somewhat of a
budget) with a fairly small amount of required disk space (under 2TB).  I'm
not sure if hyper-converged setup w/GlusterFS is the answer or not.  I'd
like to avoid spending 15k only to find out that it's too slow.

On Fri, Apr 6, 2018 at 6:05 AM, Yaniv Kaul <ykaul at redhat.com> wrote:

>
>
> On Thu, Apr 5, 2018, 11:39 PM Vincent Royer <vincent at epicenergy.ca> wrote:
>
>> Jayme,
>>
>> I'm doing a very similar build, the only difference really is I am using
>> SSDs instead of HDDs.   I have similar questions as you regarding expected
>> performance. Have you considered JBOD + NFS?   Putting a Gluster Replica 3
>> on top of RAID 10 arrays sounds very safe, but my gosh the capacity takes a
>> massive hit.  Am I correct in saying you will only get 4TB total usable
>> capacity out of 24TB worth of disks?  The cost per TB in that sort of
>> scenario is immense.
>>
>> My plan is two 2TB SSDs per server in JBOD with a caching raid card, with
>> replica 3.  I would end up with the same 4TB total capacity using 12TB of
>> SSDs.
>>
>
> I'm not sure I see the value in RAID card if you don't use RAID and I'm
> not sure you really need caching on the card.
> Y.
>
>
>> I think Replica 3 is safe enough that you could forgo the RAID 10. But
>> I'm talking from zero experience...  Would love others to chime in with
>> their opinions on both these setups.
>>
>> *Vincent Royer*
>> *778-825-1057*
>>
>>
>> <http://www.epicenergy.ca/>
>> *SUSTAINABLE MOBILE ENERGY SOLUTIONS*
>>
>>
>>
>>
>> On Thu, Apr 5, 2018 at 12:22 PM, Jayme <jaymef at gmail.com> wrote:
>>
>>> Thanks for your feedback.  Any other opinions on this proposed setup?
>>> I'm very torn over using GlusterFS and what the expected performance may
>>> be, there seems to be little information out there.  Would love to hear any
>>> feedback specifically from ovirt users on hyperconverged configurations.
>>>
>>> On Thu, Apr 5, 2018 at 2:56 AM, Alex K <rightkicktech at gmail.com> wrote:
>>>
>>>> Hi,
>>>>
>>>> You should be ok with the setup.
>>>> I am running around 20 vms (linux and windows, small and medium size)
>>>> with the half of your specs. With 10G network replica 3 is ok.
>>>>
>>>> Alex
>>>>
>>>> On Wed, Apr 4, 2018, 16:13 Jayme <jaymef at gmail.com> wrote:
>>>>
>>>>> I'm spec'ing hardware for a 3-node oVirt build (on somewhat of a
>>>>> budget).  I plan to do 20-30 Linux VMs most of them very light weight + a
>>>>> couple of heavier hitting web and DB servers with frequent rsync backups.
>>>>> Some have a lot of small files from large github repos etc.
>>>>>
>>>>> 3X of the following:
>>>>>
>>>>> Dell PowerEdge R720
>>>>> 2x 2.9 GHz 8 Core E5-2690 (SR0L0)
>>>>> 256GB RAM
>>>>> PERC H710
>>>>> 2x10GB Nic
>>>>>
>>>>> Boot/OS will likely be two cheaper small sata/ssd in raid 1.
>>>>>
>>>>> Gluster bricks comprised of 4x2TB WD Gold 7200RPM SATA HDDs in RAID 10
>>>>> per server.  Using a replica 3 setup (and I'm thinking right now with no
>>>>> arbiter for extra redundancy, although I'm not sure what the performance
>>>>> hit may be as a result).  Will this allow for two host failure or just one?
>>>>>
>>>>> I've been really struggling with storage choices, it seems very
>>>>> difficult to predict the performance of glusterFS due to the variance in
>>>>> hardware (everyone is using something different).  I'm not sure if the
>>>>> performance will be adequate enough for my needs.
>>>>>
>>>>> I will be using an all ready existing Netgear XS716T 10GB switch for
>>>>> Gluster storage network.
>>>>>
>>>>> In addition I plan to build another simple glusterFS storage server
>>>>> that I can use to georeplicate the gluster volume to for DR purposes and
>>>>> use existing hardware to build an independent standby oVirt host that is
>>>>> able to start up a few high priority VMs from the georeplicated glusterFS
>>>>> volume if for some reason the primary oVirt cluster/glusterFS volume ever
>>>>> failed.
>>>>>
>>>>> I would love to hear any advice or critiques on this plan.
>>>>>
>>>>> Thanks!
>>>>> _______________________________________________
>>>>> Users mailing list
>>>>> Users at ovirt.org
>>>>> http://lists.ovirt.org/mailman/listinfo/users
>>>>>
>>>>
>>>
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>>>
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