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

[Eneko Lacunza]

You can do so from CLI:

ceph osd crush reweight osd.N

https://ceph.com/geen-categorie/difference-between-ceph-osd-reweight-and-ceph-osd-crush-reweight/

El 31/08/18 a las 13:01, Gilberto Nunes escribió:
> Thanks a lot for all this advice guys.
> I still learn with Ceph.
> So I have a doubt regarding how to change the weight from certain hdd
> Is there some command to do that?
>
> Em sex, 31 de ago de 2018 05:58, Ronny Aasen <ronny+pve-user at aasen.cx>
> escreveu:
>
>> 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
>>>>>>
>>>>>> ____________________________________________________________________
>>>>>> Proxmox Server Solutions GmbH
>>>>>> Bräuhausgasse 37, 1050 Vienna, Austria
>>>>>> Commercial register no.: FN 258879 f
>>>>>> Registration office: Handelsgericht Wien
>>>>>>
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