Thanks again.
De: "Gianluca Cecchi" <gianluca.cec...@gmail.com> Para: supo...@logicworks.pt Cc: "Petr Kotas" <pko...@redhat.com>, "users" <users@ovirt.org> Enviadas: Sexta-feira, 3 De Agosto de 2018 15:39:58 Assunto: Re: [ovirt-users] Re: Pool On Fri, Aug 3, 2018 at 4:23 PM, < supo...@logicworks.pt > wrote: Thanks Gianluca What is the advantage to be in stateless? José I think you could read this link: https://www.ovirt.org/documentation/admin-guide/chap-Pools/ and also official RHV doc here: https://access.redhat.com/documentation/en-us/red_hat_virtualization/4.2/html/administration_guide/chap-pools In particular: : Virtual machine pools are stateless by default, meaning that virtual machine data and configuration changes are not persistent across reboots. However, the pool can be configured to be stateful, allowing changes made by a previous user to persist. However, if a user configures console options for a virtual machine taken from a virtual machine pool, those options will be set as the default for that user for that virtual machine pool. NOTE Virtual machines taken from a pool are not stateless when accessed from the Administration Portal. This is because administrators need to be able to write changes to the disk if necessary. " And also https://access.redhat.com/documentation/en-us/red_hat_virtualization/4.2/html/administration_guide/detaching_virtual_machines_from_a_vm_pool with " Ensure the virtual machine has a status of Down; you cannot detach a running virtual machine. " It is quite some time and I thought you had to detach the VM while running, while the phrase above confirms the opposite. It is to be understood the time when the changes are deleted in case of stateless. You can use pools for temporary stations to give to your guests, or to setup labs where you want your pool to be already setup and running (the feature of pre-start) and cleared after students have used it. Using REST-API (I dont think you can configure from web admin gui) you can timely check how many free (powered off) VMs remain and dynamically grow the pool if needed HIH, Gianluca
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