Tempest recently got some new tests for the nova diagnostics API [1] which failed when I was running against the powervm driver since it doesn't implement that API. I started looking at other drivers that did and found that libvirt, vmware and xenapi at least had code for the get_diagnostics method. I found that the vmware driver was re-using it's get_info method for get_diagnostics which led to bug 1237622 [2] but overall caused some confusion about the difference between the compute driver's get_info and get_diagnostics mehods. It looks like get_info is mainly just used to get the power_state of the instance.
First, the get_info method has a nice docstring for what it needs returned [3] but the get_diagnostics method doesn't [4]. From looking at the API docs [5], the diagnostics API basically gives an example of values to get back which is completely based on what the libvirt driver returns. Looking at the xenapi driver code, it looks like it does things a bit differently than the libvirt driver (maybe doesn't return the exact same keys, but it returns information based on what Xen provides). I'm thinking about implementing the diagnostics API for the powervm driver but I'd like to try and get some help on defining just what should be returned from that call. There are some IVM commands available to the powervm driver for getting hardware resource information about an LPAR so I think I could implement this pretty easily. I think it basically comes down to providing information about the processor, memory, storage and network interfaces for the instance but if anyone has more background information on that API I'd like to hear it. [1] https://github.com/openstack/tempest/commit/da0708587432e47f85241201968e6402190f0c5d [2] https://bugs.launchpad.net/nova/+bug/1237622 [3] https://github.com/openstack/nova/blob/2013.2.rc1/nova/virt/driver.py#L144 [4] https://github.com/openstack/nova/blob/2013.2.rc1/nova/virt/driver.py#L299 [5] http://paste.openstack.org/show/48236/ Thanks, MATT RIEDEMANN Advisory Software Engineer Cloud Solutions and OpenStack Development Phone: 1-507-253-7622 | Mobile: 1-507-990-1889 E-mail: mrie...@us.ibm.com 3605 Hwy 52 N Rochester, MN 55901-1407 United States
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