Re: [Libvir] Proposal for the storage API (for discussion only)

On Fri, Oct 19, 2007 at 01:35:25PM +0100, Richard W.M. Jones wrote: > I think this is fair enough. The important part is to make sure that > the sysadmin can configure it, and it doesn't make much difference > whether we use scriptlets or just have configuration options. It depends on the level of configuration. I don't want the sysadmin to be configuring command line args directly. For any input XML metadata to the libvirt API, we should always run a pre-determined command argv. This is important to ensure that the same storage description results in the same underlying operations no matter what machine it is run on. This ensures that applications have a consistent API, and that people debugging bug reports don't have to worry about local modifications to the API's meaning. The sysadmin can define the configure the storage pools they wish to have available via the APIs we provide directly. Now, if we want the sys-admin to be able to provide specific command line tools, for storage then I'd suggest we add an explicit 'site local' storage pool type. A 'site local' pool type would simple hand all the operations off to sysadmin configured commands. This way, if they use the built in lvm, or file, or iscsi, or block device backends we know exactly what the results are going to be. If they use the 'site local' backend we know to expect the unexpected.