[ovirt-users] Hardware critique

Thu Apr 5 20:50:07 UTC 2018

I always found replica 3 a complete overkill. Don't know people made that
up that was necessary. Just looks good and costs a lot with little benefit.

Normally when using magnetic disks 2 copies are fine for most scenarios,
but if using SSDs for similar scenarios depending on the configuration of
each node disks it is possible to have a RAID 5/6 ish.
Fernando

2018-04-05 17:38 GMT-03:00 Vincent Royer <vincent at epicenergy.ca>:

> 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 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!
>>>> _______________________________________________
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>>>> Users at ovirt.org
>>>> http://lists.ovirt.org/mailman/listinfo/users
>>>>
>>>
>>
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