[PVE-User] PRoxmox and ceph with just 3 server.

[Ronny Aasen]

when adding a older machine to your cluster, keep in mind that the 
slowest node with determine the overall speed of the ceph cluster (since 
a vm's disk will be spread all over)


for RBD vm's you want low latency, so use things like
nvram > ssd > hdd  with osd latency significant difference here.

100Gb/25Gb > 40Gb/10Gb (1Gb is useless in this case imho)

as long as you have enough cores, higher ghz is better then lower ghz. 
due to lower latency

kind regards.
Ronny Aasen



On 31. aug. 2018 00:21, Gilberto Nunes wrote:
> An HPE Server will remain after deploy 3 servers with proxmox and ceph.
> I thing I will use this HPE server as 4th node!
> 
> 
> ---
> Gilberto Nunes Ferreira
> 
> (47) 3025-5907
> (47) 99676-7530 - Whatsapp / Telegram
> 
> Skype: gilberto.nunes36
> 
> 
> 
> 
> 2018-08-30 18:16 GMT-03:00 Ronny Aasen <ronny+pve-user at aasen.cx>:
> 
>> if HA is important, you should consider having a 4th ceph osd server (does
>> not have to also be proxmox)
>>
>> with ceph's default of 3 replicas, that you will want to use in  a
>> production setup, you do not have any failure domain.
>> IOW the loss of any one node = a degraded ceph cluster.  if you have an
>> additional node, ceph will rebalance and return to HEALTH_OK on the failure
>> of a node.
>>
>> with vm's iops are important so you must keep latency to a minimum.
>>
>> both of these are explained a bit more in detail in the link he posted.
>>
>>
>> kind regards
>> Ronny Aasen
>>
>>
>>
>> On 30.08.2018 20:46, Gilberto Nunes wrote:
>>
>>> Hi Martin.
>>>
>>> Not really worried about highest performance, but to know if it will work
>>> properly, mainly HA!
>>> I plan work with mesh network too.
>>>
>>> Tanks a lot
>>>
>>> ---
>>> Gilberto Nunes Ferreira
>>>
>>> (47) 3025-5907
>>> (47) 99676-7530 - Whatsapp / Telegram
>>>
>>> Skype: gilberto.nunes36
>>>
>>>
>>>
>>>
>>> 2018-08-30 15:40 GMT-03:00 Martin Maurer <martin at proxmox.com>:
>>>
>>> Hello,
>>>>
>>>> Not really. Please read in detail the following:
>>>>
>>>> https://forum.proxmox.com/threads/proxmox-ve-ceph-benchmark-
>>>> 2018-02.41761/
>>>>
>>>>
>>>> On 30.08.2018 16:47, Gilberto Nunes wrote:
>>>>
>>>> Hi there
>>>>>
>>>>> It's possible create a scenario with 3 PowerEdge r540, with Proxmox and
>>>>> Ceph.
>>>>> The server has this configuration:
>>>>>
>>>>> 32 GB memory
>>>>> SAS 2x 300 GB
>>>>> SSD 1x 480 GB
>>>>>
>>>>> 2 VM with SQL and Windows server.
>>>>>
>>>>> Thanks
>>>>>
>>>>> ---
>>>>> Gilberto Nunes Ferreira
>>>>>
>>>>> (47) 3025-5907
>>>>> (47) 99676-7530 - Whatsapp / Telegram
>>>>>
>>>>> Skype: gilberto.nunes36
>>>>> _______________________________________________
>>>>> pve-user mailing list
>>>>> pve-user at pve.proxmox.com
>>>>> https://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-user
>>>>>
>>>>>
>>>>> --
>>>> Best Regards,
>>>>
>>>> Martin Maurer
>>>>
>>>> martin at proxmox.com
>>>> http://www.proxmox.com
>>>>
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