Re: Calculating VMs/CPU
On Sun, Feb 05, 2023 at 10:12:39PM +, Mike Larkin wrote: > On Sun, Feb 05, 2023 at 03:53:34PM -0500, Nick Holland wrote: > > On 2/4/23 17:31, latin...@vcn.bc.ca wrote: > > > Hello misc > > > > > > i am building an only VMD server: > > > > > > How could calculate the relation: CPU, Ram, Storage, VMs please? > > > > > > Thanks. > > > PD: > > > I have a Lenovo ThinkPad Edge 4 i3 cores, 500GB disk. 8GB Ram. > > > > > > > This is kinda virtualization 101 stuff, not really specific to OpenBSD. > > > > RAM: assume more than 1:1. The VM will require certain overhead, as will > > the base OS. So, if you want 2G VMs, you won't be getting four of them > > on your 8G machine. You might get three. (some VM systems support > > "thin provisioning" of RAM. This is really a great way to hurt yourself > > unless you really know what you -- and all your guest OSs -- are doing. > > And you are still really likely to hurt yourself). > > All vmm memory is wired, so do not overcommit memory with vmm/vmd. > > > > > Disk: Assume 1:1. Even if your VM system supports thin provisioning > > (OpenBSD doesn't appear to), don't. Assume you will use 100% of the > > Both supported formats (qcow2 and raw) are thin. But your advice is > sound; assume you will eventually use 100% of what you provision. Here's what I meant by that: $ /export/VMs> vmctl create -s 100g big.raw vmctl: raw imagefile created $ /export/VMs> du -h big.raw 192Kbig.raw $ /export/VMs> ls -la big.raw -rw--- 1 mlarkin wheel 107374182400 Feb 5 14:20 big.raw Same holds true for qcow2. -ml > > > disk you provision for a VM. Because you will. Thin provisioning VMs > > is generally a bad idea. > > > > CPU: Test, don't speculate. This is where you can get some benefit from > > resource sharing. You can also end up fooling yourself into thinking > > that 10 VMs that are usually 90% idle can share one CPU, because that > > 10% busy time? They are all working on the same task. > > > > > > In your case of a 4xi3 8g/500g, I suspect your machine will run out of > > RAM, CPU and then disk, in that order, though if you work at it, you > > can run out in any order you wish. :) > > > > But it is all how you define your VMs and what you do with it. Your > > host i3 could be maxed out with a web browser, so the VMs you run are > > going to have to be minimal and your expectations modest. > > > > Nick. > > >
Re: Calculating VMs/CPU
On Sun, Feb 05, 2023 at 03:53:34PM -0500, Nick Holland wrote: > On 2/4/23 17:31, latin...@vcn.bc.ca wrote: > > Hello misc > > > > i am building an only VMD server: > > > > How could calculate the relation: CPU, Ram, Storage, VMs please? > > > > Thanks. > > PD: > > I have a Lenovo ThinkPad Edge 4 i3 cores, 500GB disk. 8GB Ram. > > > > This is kinda virtualization 101 stuff, not really specific to OpenBSD. > > RAM: assume more than 1:1. The VM will require certain overhead, as will > the base OS. So, if you want 2G VMs, you won't be getting four of them > on your 8G machine. You might get three. (some VM systems support > "thin provisioning" of RAM. This is really a great way to hurt yourself > unless you really know what you -- and all your guest OSs -- are doing. > And you are still really likely to hurt yourself). All vmm memory is wired, so do not overcommit memory with vmm/vmd. > > Disk: Assume 1:1. Even if your VM system supports thin provisioning > (OpenBSD doesn't appear to), don't. Assume you will use 100% of the Both supported formats (qcow2 and raw) are thin. But your advice is sound; assume you will eventually use 100% of what you provision. > disk you provision for a VM. Because you will. Thin provisioning VMs > is generally a bad idea. > > CPU: Test, don't speculate. This is where you can get some benefit from > resource sharing. You can also end up fooling yourself into thinking > that 10 VMs that are usually 90% idle can share one CPU, because that > 10% busy time? They are all working on the same task. > > > In your case of a 4xi3 8g/500g, I suspect your machine will run out of > RAM, CPU and then disk, in that order, though if you work at it, you > can run out in any order you wish. :) > > But it is all how you define your VMs and what you do with it. Your > host i3 could be maxed out with a web browser, so the VMs you run are > going to have to be minimal and your expectations modest. > > Nick. >
Re: Calculating VMs/CPU
On 2/4/23 17:31, latin...@vcn.bc.ca wrote: Hello misc i am building an only VMD server: How could calculate the relation: CPU, Ram, Storage, VMs please? Thanks. PD: I have a Lenovo ThinkPad Edge 4 i3 cores, 500GB disk. 8GB Ram. This is kinda virtualization 101 stuff, not really specific to OpenBSD. RAM: assume more than 1:1. The VM will require certain overhead, as will the base OS. So, if you want 2G VMs, you won't be getting four of them on your 8G machine. You might get three. (some VM systems support "thin provisioning" of RAM. This is really a great way to hurt yourself unless you really know what you -- and all your guest OSs -- are doing. And you are still really likely to hurt yourself). Disk: Assume 1:1. Even if your VM system supports thin provisioning (OpenBSD doesn't appear to), don't. Assume you will use 100% of the disk you provision for a VM. Because you will. Thin provisioning VMs is generally a bad idea. CPU: Test, don't speculate. This is where you can get some benefit from resource sharing. You can also end up fooling yourself into thinking that 10 VMs that are usually 90% idle can share one CPU, because that 10% busy time? They are all working on the same task. In your case of a 4xi3 8g/500g, I suspect your machine will run out of RAM, CPU and then disk, in that order, though if you work at it, you can run out in any order you wish. :) But it is all how you define your VMs and what you do with it. Your host i3 could be maxed out with a web browser, so the VMs you run are going to have to be minimal and your expectations modest. Nick.
Re: Calculating VMs/CPU
> On Sat, Feb 04, 2023 at 10:02:13PM -0800, latin...@vcn.bc.ca wrote: >> > On Sat, Feb 04, 2023 at 02:31:39PM -0800, latin...@vcn.bc.ca wrote: >> >> Hello misc >> >> >> >> i am building an only VMD server: >> >> >> >> How could calculate the relation: CPU, Ram, Storage, VMs please? >> >> >> >> Thanks. >> >> PD: >> >> I have a Lenovo ThinkPad Edge 4 i3 cores, 500GB disk. 8GB Ram. >> >> >> > >> > what are you planning on running? >> > >> >> Thanks for your attention: >> >> For now, only OpenBSD with connection to the world' the 3rd option i >> think. >> >> In the future: >> BSD and Linux! >> >> How can i get the related information please. I have installed OpenBSD >> 7.2 >> and it is a testing laptop. it is going to be reproduced on arented bare >> metal Server. >> >> >> >> > > I can't answer your question without knowing what you plan to run in the > VMs. > > Just don't overcommit RAM. > > -ml > I am sorry, but unable to comprehend your question: i have Openbsd 7.2, using that System, i am going to use vmd; creating the most VMs that are possible, but i have had a bad experience, with 64 GB of RAM, and 15 VMs, the system seems exhausted! That is why i would like to know how to calculate how many VMs i could run in my Laptop whitout a problem. Thanks.
Re: Calculating VMs/CPU
On Sat, Feb 04, 2023 at 10:02:13PM -0800, latin...@vcn.bc.ca wrote: > > On Sat, Feb 04, 2023 at 02:31:39PM -0800, latin...@vcn.bc.ca wrote: > >> Hello misc > >> > >> i am building an only VMD server: > >> > >> How could calculate the relation: CPU, Ram, Storage, VMs please? > >> > >> Thanks. > >> PD: > >> I have a Lenovo ThinkPad Edge 4 i3 cores, 500GB disk. 8GB Ram. > >> > > > > what are you planning on running? > > > > Thanks for your attention: > > For now, only OpenBSD with connection to the world' the 3rd option i think. > > In the future: > BSD and Linux! > > How can i get the related information please. I have installed OpenBSD 7.2 > and it is a testing laptop. it is going to be reproduced on arented bare > metal Server. > > > > I can't answer your question without knowing what you plan to run in the VMs. Just don't overcommit RAM. -ml
Re: Calculating VMs/CPU
> On Sat, Feb 04, 2023 at 02:31:39PM -0800, latin...@vcn.bc.ca wrote: >> Hello misc >> >> i am building an only VMD server: >> >> How could calculate the relation: CPU, Ram, Storage, VMs please? >> >> Thanks. >> PD: >> I have a Lenovo ThinkPad Edge 4 i3 cores, 500GB disk. 8GB Ram. >> > > what are you planning on running? > Thanks for your attention: For now, only OpenBSD with connection to the world' the 3rd option i think. In the future: BSD and Linux! How can i get the related information please. I have installed OpenBSD 7.2 and it is a testing laptop. it is going to be reproduced on arented bare metal Server.
Re: Calculating VMs/CPU
On Sat, Feb 04, 2023 at 02:31:39PM -0800, latin...@vcn.bc.ca wrote: > Hello misc > > i am building an only VMD server: > > How could calculate the relation: CPU, Ram, Storage, VMs please? > > Thanks. > PD: > I have a Lenovo ThinkPad Edge 4 i3 cores, 500GB disk. 8GB Ram. > what are you planning on running?
