[sheepdog-users] Testing snapshot-object-reclaim

[Valerio Pachera]

I got a strange behaviour: after removing a big file on the guest, it
wasn't able to write a second one (no space left on the device).
Sheepdog daemon version 0.8.0_118_g1c75b2a

---
dog vdi list
  Name        Id    Size    Used  Shared    Creation time   VDI id  Copies  Tag
  test         0   10 GB  2.3 GB  0.0 MB 2014-03-04 17:23   7c2b25
2:1

dog vdi snapshot test

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 2014-03-04 17:23   7c2b25
2:1
  test         0   10 GB  0.0 MB  2.3 GB 2014-03-05 08:50   7c2b26
2:1

dog node info
Id      Size    Used    Avail   Use%
 0      233 GB  1.2 GB  231 GB    0%
 1      452 GB  1.2 GB  451 GB    0%
 2      500 GB  1.2 GB  499 GB    0%
Total   1.2 TB  3.6 GB  1.2 TB    0%
Total virtual image size        10 GB

<write big file on guest>
dog vdi snapshot test
<delete big file on guest>
dog vdi snapshot test
<write another big file on guest>
<error: no space left on the device>

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 2014-03-04 17:23   7c2b25
2:1
s test         2   10 GB  5.9 GB  348 MB 2014-03-05 08:50   7c2b26
2:1
s test         3   10 GB  332 MB  5.9 GB 2014-03-05 08:53   7c2b27
2:1
  test         0   10 GB  1.1 GB  5.1 GB 2014-03-05 08:53   7c2b28
2:1

dog node info
Id      Size    Used    Avail   Use%
 0      233 GB  8.3 GB  224 GB    3%
 1      452 GB  8.3 GB  444 GB    1%
 2      500 GB  8.3 GB  491 GB    1%
Total   1.2 TB  25 GB   1.1 TB    2%
Total virtual image size        10 GB

---

I also think 25GB of used space seems to much.
On the guest I can write no ore than 4.7G and I was able to write the
big file only once.

I get no error/warning messages in sheep.log


Mar 05 08:47:30   INFO [main] md_add_disk(333) /mnt/sheep/dsk01, vdisk
nr 500, total disk 1
Mar 05 08:47:30 NOTICE [main] get_local_addr(519) found IPv4 address
Mar 05 08:47:31   INFO [main] send_join_request(787) IPv4
ip:192.168.10.6 port:7000
Mar 05 08:47:31 NOTICE [main] nfs_init(542) nfs server service is not compiled
Mar 05 08:47:31   INFO [main] check_host_env(493) Allowed open files
1024000, suggested 6144000
Mar 05 08:47:31   INFO [main] main(935) sheepdog daemon (version
0.8.0_118_g1c75b2a) started