[sheepdog] [PATCH v8 19/19] tests/functional: new test of object reclaim for a case of continuously snapshotted VDI

[Valerio Pachera]

Tested-by: Valerio Pachera

Result of my testing is that snapshots get correctly removed freeing space
in the cluster.
I've been testing full replication (-c 2) and erasure code (-c 2:1).

Removing all snapshots and vdi (so no vdi left in the cluster), most of the
time leave almost no objects (e.g. 6M).
In some case (but we can't actually reproduce it), more objects are left
(e.g. 600M).

Here's an example

s test         1  5.0 GB  1.0 GB  0.0 MB 2014-05-21 12:46   7c2b25
2
s test         2  5.0 GB  4.4 GB  340 MB 2014-05-21 12:46   7c2b26
2
s test         3  5.0 GB   24 MB  4.7 GB 2014-05-21 12:49   7c2b27
2
s test         4  5.0 GB  4.4 GB  340 MB 2014-05-21 12:49   7c2b28
2
s test         5  5.0 GB   28 MB  4.7 GB 2014-05-21 12:52   7c2b29
2
s test         6  5.0 GB   32 MB  4.7 GB 2014-05-21 12:52   7c2b2a
2
  test         0  5.0 GB  0.0 MB  4.7 GB 2014-05-21 12:53   7c2b2b      2

This is total size (dog node info), before removing the snapshot; after
removing snapshots one after the other and, finally, the vdi.
Total   682 GB  20 GB   663 GB    2%
Total   682 GB  18 GB   664 GB    2%
Total   682 GB  18 GB   664 GB    2%
Total   682 GB  9.5 GB  673 GB    1%
Total   682 GB  9.5 GB  673 GB    1%
Total   682 GB  9.4 GB  673 GB    1%
Total   682 GB  9.4 GB  673 GB    1%
Total   682 GB  0.1 MB  682 GB    0%

Sheepdog daemon version 0.8.0_171_g4414730
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