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Hi Lorin,

Thanks to point me the branch. I messed it. So you set the memory in Mb and disk in Kb.

I have questions:

1)      The method 'update_status' in class HostState doesn't return anything, so why method 'update_host_status' in class 'LibvirtConnection'  return it ?

2)      I made this change on my testing infrastructure. I set a parent zone without compute workers, a child zone with compute worker. When the parent zone ask child to return weights list of compute hosts, the child reserved (the method '_schedule' in class 'ZoneAwareScheduler' calls 'consume_resources' on each asked hosts) the resources for the instance while it doesn't know if it will be selected. Do you meet that problem ?
Édouard.

De : Lorin Hochstein [mailto:lorin at isi.edu]
Envoyé : mercredi 20 juillet 2011 17:44
À : THULEAU Edouard NRS
Cc : openstack at lists.launchpad.net
Objet : Re: [Openstack] Host filter Instance Type Filter with virt layer Libvirt

Edouard:

There's another branch that has this code added to the libvirt layer, which has already been proposed for merge. I need to make some minor fixes, but once I do, I think it will be approved for merge.

Here's the merge proposal: https://code.launchpad.net/~usc-isi/nova/extra_specs_sched/+merge/65980

Lorin
--
Lorin Hochstein, Computer Scientist
USC Information Sciences Institute
703.812.3710
http://www.east.isi.edu/~lorin

On Jul 20, 2011, at 11:15 AM, <edouard1.thuleau at orange-ftgroup.com<mailto:edouard1.thuleau at orange-ftgroup.com>> wrote:


Hi,

I try to add code to the Libvirt layer to enable the Instance Type Filter needed by the zone aware scheduler.
I looked the code of fake virt layer which implement that. The table 'host_status' in class 'FakeConnection' contains all capabilities of the host:

self.host_status = {
          'host_name-description': 'Fake Host',
          'host_hostname': 'fake-mini',
          'host_memory_total': 8000000000,
          'host_memory_overhead': 10000000,
          'host_memory_free': 7900000000,
          'host_memory_free_computed': 7900000000,
          'host_other_config': {},
          'host_ip_address': '192.168.1.109',
          'host_cpu_info': {},
          'disk_available': 500000000000,
          'disk_total': 600000000000,
          'disk_used': 100000000000,
          'host_uuid': 'cedb9b39-9388-41df-8891-c5c9a0c0fe5f',
         'host_name_label': 'fake-mini'
}

Nothing explain what corresponding each elements of this table and what unit use. I suppose, the unit is bytes for disk and memory.
And in the code of the host filtering in the scheduler (nova/scheduler/host_filter.py method class 'InstanceTypeFilter' method 'host_filtrer'), the scheduler compares the host capabilities with specified resources of the instance to determined which host can support it. But specified resources of the instance is in Mbytes for memory and Gbytes for the disk. Is it normal ?

Édouard.

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