[PVE-User] Proxmox per VM memory limit

dorsy dorsyka at yahoo.com
Wed Oct 3 14:48:08 CEST 2018


Does the CPU and host/guest OS support addressing 2TB RAM?
Most CPU-s can address <=2^40bit physical memory!

For example "address sizes    : 39 bits physical, 48 bits virtual" for 
my laptop cpu.

On 2018. 10. 03. 14:18, Gilberto Nunes wrote:
> That's ok for RHEL and pure KVM/QEMU.
> But I thing Proxmox staff do something to the QEMU code used in Proxmox,
> because this friend of mine doesn't get a VM with more than 1 TB of memory
> to work properly!
>
> ---
> Gilberto Nunes Ferreira
>
> (47) 3025-5907
> (47) 99676-7530 - Whatsapp / Telegram
>
> Skype: gilberto.nunes36
>
>
>
>
>
> Em qua, 3 de out de 2018 às 04:34, dorsy <dorsyka at yahoo.com> escreveu:
>
>> Since it is kvm, you can look at the kvm limits:
>>
>> https://access.redhat.com/articles/rhel-kvm-limits
>>
>> On 2018. 10. 03. 5:14, Woods, Ken A (DNR) wrote:
>>> I see.  I wonder if that person was confused.
>>> XenServer does have a 1TB limit.
>>>
>>> (But, I’m not staff for them, either. )
>>>
>>>
>>>> On Oct 2, 2018, at 18:32, Gilberto Nunes <gilberto.nunes32 at gmail.com>
>> wrote:
>>>> Because somebody told me that Proxmox could not address more than 1TB.
>>>> Never mind!
>>>>
>>>> ---
>>>> Gilberto Nunes Ferreira
>>>>
>>>> (47) 3025-5907
>>>> (47) 99676-7530 - Whatsapp / Telegram
>>>>
>>>> Skype: gilberto.nunes36
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> Em ter, 2 de out de 2018 às 22:23, Woods, Ken A (DNR) <
>> ken.woods at alaska.gov>
>>>> escreveu:
>>>>
>>>>> I'm not a staff member.  Just a warning--I might be totally wrong about
>>>>> all this.  Or...not.
>>>>>
>>>>> IIRC, the coded limit is 4TiB per VM (I think there's a QEMU imposed
>> limit
>>>>> at 42 bits...somebody correct me if I'm wrong.) Which gets into a
>> whole big
>>>>> off-topic discussion about address paths and the size of page tables
>> and
>>>>> their structure, so....yeah.  Anyway.
>>>>>
>>>>> I'm going to guess (given your recent posts) that you don't have that
>> much
>>>>> available on the hosts, so Mark's answer is still correct--it's as
>> much as
>>>>> you have in your hosts.
>>>>>
>>>>> So we can *all* bypass some back and forth:  Are you *really* trying to
>>>>> ask about memory over-commitment?
>>>>> If so, the short answer is "Please don't do that if you care about
>>>>> stability, which we know you do. Use ballooning."
>>>>> If not, please ask the question behind "how much memory can I allocate
>> to
>>>>> a VM?"
>>>>> In short:  Why are you asking?
>>>>>
>>>>> kw
>>>>>
>>>>>
>>>>> -----Original Message-----
>>>>> From: pve-user [mailto:pve-user-bounces at pve.proxmox.com] On Behalf Of
>>>>> Gilberto Nunes
>>>>> Sent: Tuesday, October 02, 2018 4:45 PM
>>>>> To: PVE User List
>>>>> Subject: Re: [PVE-User] Proxmox per VM memory limit
>>>>>
>>>>> Good. Nice to hear that.
>>>>> But I need someone in the Proxmox staff could answer the question...
>> Just
>>>>> to be more accurate about it.
>>>>> Thanks
>>>>>
>>>>> Em ter, 2 de out de 2018 17:53, Mark Adams <mark at openvs.co.uk>
>> escreveu:
>>>>>> assuming the OS in the VM supports it, as much as the host hardware
>>>>>> can support (no limit).
>>>>>>
>>>>>> On Tue, 2 Oct 2018 at 19:35, Gilberto Nunes
>>>>>> <gilberto.nunes32 at gmail.com>
>>>>>> wrote:
>>>>>>
>>>>>>> Hi there!
>>>>>>>
>>>>>>> How many memory per VM I get in PVE?
>>>>>>> Is there some limit? 1 TB? 2 TB?
>>>>>>> Just curious
>>>>>>>
>>>>>>> Thanks
>>>>>>> ---
>>>>>>> Gilberto Nunes Ferreira
>>>>>>>
>>>>>>> (47) 3025-5907
>>>>>>> (47) 99676-7530 - Whatsapp / Telegram
>>>>>>>
>>>>>>> Skype: gilberto.nunes36
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