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Hm... on your pty, try:

 > python -c "import os; hdd = os.statvfs(FLAGS.instances_path); print 
hdd.f_frsize * hdd.f_blocks;"

that is exactly how to calculate total disk.
  if you got minus value, something unexpected situation occurs.

Kei


(2012/06/01 9:01), William Herry wrote:
> Thank you and yes, I use kvm-block migration
>
> On Thu, May 31, 2012 at 8:55 PM, Kei.masumoto <kei.masumoto at gmail.com
> <mailto:kei.masumoto at gmail.com>> wrote:
>
>
>     To check free_disk_gb,
>      >        stats = libvirt_utils.get_fs_info( FLAGS.instances_path)
>      >        return stats['total'] / (1024 ** 3)
>
>     I dont think disk space is not cheched on executing live-migration.
>     available disk space is only checked for kvm-block migration.
>
>     Kei
>
>
>     (2012/05/31 12:08), William Herry wrote:
>
>         When I run live-migration, it fail because of:
>         MigrationError_Remote: Migration error: Unable to migrate
>         e0fd9c27-cc7b-4420-bd8a- 6dd9d5316929 to compute2: Lack of
>         disk(host:-188978561024 <= instance:37580963840)
>
>         In fact I have 170G free disk on compute2, then I check nova
>         database
>         and find this in compute_nodes which compute2 have:
>         disk_available_least: -176
>                   free_ram_mb: 41086
>                  free_disk_gb: -149
>
>         my question is that, how nova get disk info and then fill to this db
>
>         by the way, horizon seems don't have ability to show host
>         capabilities
>         which I can easy to know how much resource left on each node
>
>         Thanks
>
>
>
>
>         --
>
>
>
>         William Herry
>         ====================
>         WilliamHerryChina at Gmail.com
>
>
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>
> William Herry
> ====================
> WilliamHerryChina at Gmail.com
>