[sheepdog-users] cache performance test

[Valerio Pachera]

2013/7/18 Liu Yuan <namei.unix at gmail.com>:
>> Is it normal that /mnt/sheep/meta/cache/  is still full of data?
> No. I think the remained cache is something related to copy-on-write mechanism
> regards of snapshot.

vdi list
s backup_data     3  1.0 TB  4.0 MB  501 GB 2013-07-12 12:40   c8d12a
   2         lug15
s backup_data     4  1.0 TB  240 MB  501 GB 2013-07-15 10:04   c8d12b
   2      lug15bis
s backup_data     5  1.0 TB  2.1 GB  501 GB 2013-07-15 10:08   c8d12c
   2  lug17_144450
s backup_data     6  1.0 TB  964 MB  503 GB 2013-07-17 14:55   c8d12d
   2  lug17_150000
s backup_data     7  1.0 TB  5.9 GB  500 GB 2013-07-17 14:59   c8d12e
   2
  backup_data     0  1.0 TB   15 GB  505 GB 2013-07-17 15:15   c8d12f     2

root at test004:/mnt/sheep/meta/cache# du -sh *
633M    19093f
8,1G    c8d128
8,0M    c8d129
4,0M    c8d12a
229M    c8d12b
1,9G    c8d12c
61M     c8d12d
5,9G    c8d12e
17M     c8d12f

After removing the cache, by rm (with no guests running), the vdi
backup_data (1T) got corrupted.
I guess it was better by 'vdi cache delete -s tag'.

vdi check of 'backup' (10G) and 'whezzy' (10G) fixed something but
seems fine (there were no snapshot for these vdi).

Notice what happens when I delete backup_data (more than 200G used, 1T virtual).

root at test004:/mnt/sheep/meta/cache# collie vdi list
  Name        Id    Size    Used  Shared    Creation time   VDI id  Copies  Tag
  backup       0   10 GB  3.1 GB  0.0 MB 2013-07-10 16:58   19093f
2
  wheezy       0   10 GB  1.8 GB  0.0 MB 2013-07-16 15:08   9533ed
2
s backup_data     3  1.0 TB  4.0 MB  501 GB 2013-07-12 12:40   c8d12a
   2         lug15
s backup_data     4  1.0 TB  236 MB  501 GB 2013-07-15 10:04   c8d12b
   2      lug15bis
s backup_data     5  1.0 TB  2.1 GB  501 GB 2013-07-15 10:08   c8d12c
   2  lug17_144450
s backup_data     6  1.0 TB  964 MB  503 GB 2013-07-17 14:55   c8d12d
   2  lug17_150000
s backup_data     7  1.0 TB  5.9 GB  500 GB 2013-07-17 14:59   c8d12e
   2
  backup_data     0  1.0 TB   15 GB  505 GB 2013-07-17 15:15   c8d12f
   2
root at test004:/mnt/sheep/meta/cache# collie vdi delete -s 3 backup_data
root at test004:/mnt/sheep/meta/cache# collie vdi delete -s 4 backup_data
root at test004:/mnt/sheep/meta/cache# collie vdi delete -s 5 backup_data
root at test004:/mnt/sheep/meta/cache# collie vdi delete -s 6 backup_data
root at test004:/mnt/sheep/meta/cache# collie vdi delete -s 7 backup_data

root at test004:/mnt/sheep/meta/cache# collie vdi delete backup_data
failed to read from socket: -1, Resource temporarily unavailable
failed to read a response

root at test004:/mnt/sheep/meta/cache# collie vdi list
  Name        Id    Size    Used  Shared    Creation time   VDI id  Copies  Tag
  backup       0   10 GB  3.1 GB  0.0 MB 2013-07-10 16:58   19093f
2
  wheezy       0   10 GB  1.8 GB  0.0 MB 2013-07-16 15:08   9533ed     2