[sheepdog-users] qemu-img conversion timing and redundancy level

Valerio Pachera sirio81 at gmail.com
Tue Feb 25 08:35:01 CET 2014

Hi,  I just wish to share this data with you.

I converted a disk on a cluster that has only 2 nodes using -c 2 and -c 2:1.
Because there are only 2 nodes, -c 2:1 don't generate parity chunks.
I was expecting -c 2:1 conversion to be faster than -c 2, but it seems
to be a little bit slower.

qcow2 -> -c 2:1
real    1m18.664s
user    0m1.352s
sys     0m6.760s

qcow2 -> -c 2
real    1m7.526s
user    0m1.204s
sys     0m7.176s

raw -> -c 2:1
real    1m10.800s
user    0m1.304s
sys     0m6.964s

raw -> -c 2
real    1m7.893s
user    0m1.300s
sys     0m7.196s

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