[sheepdog-users] cluster snapshot save and load speed

Valerio Pachera sirio81 at gmail.com
Tue Jan 21 09:23:09 CET 2014

time dog cluster snapshot load testErasure /mnt/big/cluster_snapshots
real    4m35.834s
user    0m43.923s
sys     0m15.981s

du -sh /mnt/big/cluster_snapshots/
1,7G    /mnt/big/cluster_snapshots/

dog vdi list
  Name        Id    Size    Used  Shared    Creation time   VDI id  Copies
s wheezy_tamplate     1   10 GB  1.8 GB  0.0 MB 2014-01-20 18:28
c6f364     3
s wheezy_tamplate     2   10 GB  1.7 GB  1.4 GB 2014-01-20 18:30
c6f365     3
  wheezy_tamplate     0   10 GB  0.0 MB  3.1 GB 2014-01-21 08:44
c6f366     3

It takes 246 second to import a snapshot of 1,7G.
The speed average is 6M/s.
I would expect a speed similar of a guest writing speed.

I precise that the impost has been made on a node with a 'AMD Turion(tm) II
Neo N40L Dual-Core Processor', sure not a monster of power.
Sheep and dog processes where both sing 20-25% of cpu each.

Saving the cluster snapshot it takes 1m38s so ~17M/s.
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