[sheepdog-users] How much spaces is used by snapshots?

[Valerio Pachera]

Considering this vdi list

  Name        Id    Size    Used  Shared    Creation time   VDI id  Copies  Tag
s backup_data     2  1.0 TB  4.7 GB  195 GB 2013-07-04 08:52   c8d129
   2         lug04
s backup_data     3  1.0 TB  118 GB  102 GB 2013-07-04 09:59   c8d12a
   2
s backup_data     4  1.0 TB  115 GB  107 GB 2013-07-05 16:42   c8d12b
   2         lug08
  backup_data     0  1.0 TB  0.0 MB  222 GB 2013-07-08 08:33   c8d12c     2

how do I calculate the amount of space used the snapshots?
What I mean is that keeping snapshots should have an impact on the
cluster available size.
Soon or later I'll fill up the cluster if I don't remove snapshots.
I would like to monitor that.

I tried to delete older snapshot and check if anything was changing in
vdi info, and it didn't

# collie node info
Id      Size    Used    Avail   Use%
 0      2.4 TB  298 GB  2.1 TB   11%
 1      2.4 TB  290 GB  2.2 TB   11%
 2      2.9 TB  354 GB  2.5 TB   11%
 3      2.3 TB  300 GB  2.0 TB   12%
Total   10 TB   1.2 TB  8.8 TB   12%
Total virtual image size        1.3 TB

# collie vdi delete -s 2 backup_data

# collie node info
Id      Size    Used    Avail   Use%
 0      2.4 TB  298 GB  2.1 TB   11%
 1      2.4 TB  290 GB  2.2 TB   11%
 2      2.9 TB  354 GB  2.5 TB   11%
 3      2.3 TB  300 GB  2.0 TB   12%
Total   10 TB   1.2 TB  8.8 TB   12%
Total virtual image size        1.3 TB