[sheepdog-users] Testing snapshot-object-reclaim

[Hitoshi Mitake]

At Mon, 24 Mar 2014 10:44:01 +0100,
Valerio Pachera wrote:
> 
> Here are logs and info
> 
> root at test004:~# qemu-img convert -f qcow2
> /mnt/big/vdi/wheezy_template_20130218.qcow2 sheepdog:test
> 
> root at test004:~# dog vdi list
>   Name        Id    Size    Used  Shared    Creation time   VDI id  Copies  Tag
>   test         0   10 GB  2.3 GB  0.0 MB 2014-03-24 09:41   7c2b25      2
> 
> root at test004:~# dog node info
> Id      Size    Used    Avail   Use%
>  0      233 GB  1.1 GB  232 GB    0%
>  1      452 GB  1.9 GB  451 GB    0%
>  2      500 GB  1.7 GB  498 GB    0%
> Total   1.2 TB  4.7 GB  1.2 TB    0%
> Total virtual image size        10 GB
> 
> root at test006:~# dog vdi snapshot test
> root at test006:~# dog vdi snapshot test
> root at test006:~# dog vdi snapshot test
> root at test006:~# dog vdi snapshot test
> root at test006:~# dog vdi snapshot test
> 
> root at test006:~# dog vdi list
>   Name        Id    Size    Used  Shared    Creation time   VDI id  Copies  Tag
> s test         1   10 GB  2.3 GB  0.0 MB 2014-03-24 09:56   7c2b25      2
> s test         2   10 GB  5.9 GB  324 MB 2014-03-24 09:59   7c2b26      2
> s test         3   10 GB  292 MB  5.9 GB 2014-03-24 10:01   7c2b27      2
> s test         4   10 GB  5.9 GB  312 MB 2014-03-24 10:01   7c2b28      2
> s test         5   10 GB  0.0 MB  6.2 GB 2014-03-24 10:08   7c2b29      2
>   test         0   10 GB   76 MB  6.2 GB 2014-03-24 10:08   7c2b2a      2

Thanks. BTW, it seems that you always create snapshot with Used=0.0 MB
during your test (the snapshot with Id=5 in the above list).

If you have time, could you run your test without such a snapshot? In
other word, could you let all snapshots have their own object?

Of course, the gc must handle such a snapshot. But I want to know the
problem is related to these snapshots.

Thanks,
Hitoshi

> 
> root at test006:~# dog node info
> Id      Size    Used    Avail   Use%
>  0      233 GB  6.7 GB  226 GB    2%
>  1      452 GB  12 GB   441 GB    2%
>  2      500 GB  11 GB   489 GB    2%
> Total   1.2 TB  29 GB   1.1 TB    2%
> Total virtual image size        10 GB
> 
> root at test006:~# time for n in $(seq 1 5); do dog vdi delete -s $n test; done
> 
> real    2m8.125s
> user    0m0.004s
> sys     0m0.000s
> 
> root at test006:~# dog vdi list
>   Name        Id    Size    Used  Shared    Creation time   VDI id  Copies  Tag
>   test         0   10 GB   76 MB  6.2 GB 2014-03-24 10:08   7c2b2a      2
> 
> root at test006:~# dog node info
> Id      Size    Used    Avail   Use%
>  0      233 GB  2.8 GB  230 GB    1%
>  1      452 GB  5.0 GB  447 GB    1%
>  2      500 GB  4.8 GB  495 GB    0%
> Total   1.2 TB  13 GB   1.1 TB    1%
> 
> Total virtual image size        10 GB
> 
> root at test006:~# dog vdi delete test
> 
> root at test006:~# dog node info
> Id      Size    Used    Avail   Use%
>  0      233 GB  212 MB  232 GB    0%
>  1      452 GB  318 MB  452 GB    0%
>  2      500 GB  260 MB  499 GB    0%
> Total   1.2 TB  791 MB  1.2 TB    0%
> Total virtual image size        0.0 MB