From vitor.lima at eldorado.org.br Thu May 23 10:38:03 2013 Content-Type: multipart/mixed; boundary="===============5500207424248330250==" MIME-Version: 1.0 From: Vitor de Lima To: devel at ovirt.org Subject: [Engine-devel] Clusters with empty processor name Date: Thu, 23 May 2013 14:37:59 +0000 Message-ID: --===============5500207424248330250== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable --_000_B2CAFC4D5E2D574A883EF61ACD5ADE3301000617SERV070corpeldo_ Content-Type: text/plain; charset=3D"us-ascii" Content-Transfer-Encoding: quoted-printable Hi everyone, While I was figuring out how to implement the support for IBM POWER in the = =3D oVirt engine, I stumbled into an use case that can cause some confusion. During the creation of a cluster, you can choose an empty processor name if= =3D you do not select the option "Enable Virt Service". As a result, it is pos= =3D sible to create a virtual machine inside a cluster without any attached hos= =3D ts. So, if you create a VM this way, it is impossible to decide in which ar= =3D chitecture it will run (if it is either x86-64 or POWER). Without knowing t= =3D his, the engine cannot show the proper list of device models (for networks,= =3D disks, displays, ...) in the frontend. It raises some questions: - Why oVirt allows the creation of clusters without a processor name? - What exactly is the "Virt Service"? Why are the processor related checks= =3D only executed if this service is enabled? - How can this use case be solved? Should the engine always enforce a prope= =3D r CPU name in all clusters? - If the engine enforces every cluster to have a CPU name, what should be d= =3D one in the default Cluster? Thanks, Vitor --_000_B2CAFC4D5E2D574A883EF61ACD5ADE3301000617SERV070corpeldo_ Content-Type: text/html; charset=3D"us-ascii" Content-Transfer-Encoding: quoted-printable

Hi everyone,<=3D /p>

While I was figuring out ho= w to=3D implement the support for IBM POWER in the oVirt engine, I stumbled into a= =3D n use case that can cause some confusion.

During the creation of a cl= uste=3D r, you can choose an empty processor name if you do not select the option &= =3D quot;Enable Virt Service". As a result, it is possible to create a vir= =3D tual machine inside a cluster without any attached hosts. So, if you create a VM this way, it is impossible to decide in whic= =3D h architecture it will run (if it is either x86-64 or POWER). Without knowi= =3D ng this, the engine cannot show the proper list of device models (for netwo= =3D rks, disks, displays, ...) in the frontend.

It raises some questions:<=3D /o:p>

- Why oVirt allows the crea= tion=3D of clusters without a processor name?

- What exactly is the "= ;Vir=3D t Service"? Why are the processor related checks only executed i= =3D f this service is enabled?

- How can this use case be = solv=3D ed? Should the engine always enforce a proper CPU name in all clusters?

- If the engine enforces ev= ery =3D cluster to have a CPU name, what should be done in the default Cluster?

Thanks,

Vitor

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