Proxmox Hypervisor, vCPU, RAM... etc

[techlists at phpcoderusa.com]

Very exciting what we are to do with modern hardware.


On 2022-10-09 03:43, Stephen Partington 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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