Proxmox Hypervisor, vCPU, RAM... etc

[Stephen Partington]

https://pve.proxmox.com/wiki/Dynamic_Memory_Management

On Sun, Oct 9, 2022, 6:44 AM Stephen Partington <cryptworks at gmail.com>
wrote:

> That mini had only one nic. And I ran about 4 containers and 2 vms just
> fine.
>
> On Sun, Oct 9, 2022, 6:43 AM Stephen Partington <cryptworks at gmail.com>
> wrote:
>
>> I have run proxmox on Mac minis 4 cores/8 threads and originally 8gm ram.
>> I upgraded ram heavily and stuffed in an ssd to run as a lvm cache to the
>> 5400 1t drive and it performed well as a home lab server for years.
>>
>> All the rest is use case recommended for a server. Possibly in
>> production.
>>
>> On Sat, Oct 8, 2022, 9:08 PM <techlists at phpcoderusa.com> wrote:
>>
>>> That sounds scary.
>>>
>>> Ok, so I am coming away with a vCPU is = to a thread.  RAM  is fixed.  I
>>> read Proxmox requires 2GB of RAM and I was unable to determine the
>>> number of cores for Proxmox.
>>>
>>> Proxmox says you will need Intel EMT64 or AMD64 with Intel VT/AMD-V CPU
>>> flag.
>>>
>>> They suggest SSD disks, and redundant Gbit NICs.  I assume along these
>>> lines you would want redundant power supplies.
>>>
>>> Another Question :
>>>
>>> I have a Cox business connection that allows me to run servers and to be
>>> allocated more than 1 static IP.
>>>
>>> I can see me configuring at least 4 virtual machines for LAMP - PHP
>>> testing and development, and a VM for a real website.  Not all of these
>>> VMs would be active at once.
>>>
>>> Since I would be running this out of my home office, to be safe, I would
>>> need enough RAM to allocate 4GB of RAM of reach _active_ VM and 2 vCPUs,
>>> and to be safe maybe 4GB of ram and 2 cores for Proxmox.
>>>
>>> For 4 simultaneously active VMs I would need 8vCPUs (8 threads) and 4GB
>>> of RAM each or 16GB of RAM.  Add to that 2 Cores/4 threads and 4GB of
>>> RAM for Proxmox and I would need 12 threads or 6 cores and 20GB of RAM.
>>>
>>> I'm thinking a 500GB SSD would be enough and if I like I could add a
>>> redundant NIC and a redundant power supply.
>>>
>>> Pretty much a consumer grade box?
>>>
>>> Your thoughts?
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> On 2022-10-07 18:23, Stephen Partington via PLUG-discuss wrote:
>>> > Hit reply too soon. You can share or overprovision ram but you have to
>>> > enable some features and load a couple of os level drivers to make it
>>> > work.
>>> >
>>> > On Fri, Oct 7, 2022, 9:22 PM Stephen Partington <cryptworks at gmail.com>
>>> > wrote:
>>> >
>>> >> And you can share ram across containers not vms.
>>> >>
>>> >> On Fri, Oct 7, 2022, 9:21 PM Stephen Partington
>>> >> <cryptworks at gmail.com> wrote:
>>> >>
>>> >> i love proxmox.have used it fir years
>>> >>
>>> >> The vcou is socket x cores x2 if you have hyperv/smt
>>> >>
>>> >> So a 4 core ht cpu would be 8vcpu.
>>> >>
>>> >> On Fri, Oct 7, 2022, 7:35 PM Keith Smith via PLUG-discuss
>>> >> <plug-discuss at lists.phxlinux.org> wrote:
>>> >>
>>> >> Hi,
>>> >>
>>> >> I just watched a video that covered the Proxmox Hypervisor.  Seems
>>> >> simple enough.  I've used Oracle's VirtualBox for years.
>>> >>
>>> >> So I did some research on what a vCPU is.  I was suppressed.  The
>>> >> math
>>> >> given was (Threads x Cores) x Physical CPU = Number vCPU.
>>> >>
>>> >> I have an old laptop that has 1 socket, 2 cores, four threads, and
>>> >> 4GB
>>> >> of RAM.
>>> >>
>>> >> Given the math (4 x 2) x 1 = 8 vCPUS.  Is this correct?
>>> >>
>>> >> From my reading it appears that RAM is not shared, so my bottleneck
>>> >> is
>>> >> RAM not cores or threads.
>>> >>
>>> >> I am a PHP developer and a local vps would need 2GB of RAM at a
>>> >> minimum.
>>> >> I have found a LAMP VPS will crash if allocated less than 2GB of
>>> >> RAM,
>>> >> and will run will on 1 vCPU.
>>> >>
>>> >> The good news is I really only need one VPS to be active at any
>>> >> given
>>> >> time.
>>> >>
>>> >> If I wanted to build a box that could run more than one VPS at a
>>> >> time,
>>> >> lets say 4, and I wanted to allocate 2 vCPUs and 4GB of RAM I would
>>> >> need
>>> >> 4 threads x 2 cores to run the 4 VPS configured with 2 vCPUs each.
>>> >>
>>> >> What about RAM.  Looks like I would need a minimum of 16GB of ram.
>>> >>
>>> >> How much resources does the Hypervisor need, in this case Proxmox?
>>> >>
>>> >> Thanks!!
>>> >> Keith
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>>
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