Hi All,

I'm facing a really slow export ov vms hosted on a single node cluster, in a 
local storage. The Vm disk is 600 GB and the effective usage is around 300 GB. 
I estimated that the following process would take up about 15 hours to end:

vdsm     25338 25332 99 04:14 pts/0    07:40:09 qemu-img measure -O qcow2 
/rhev/data-center/mnt/_data/6775c41c-7d67-451b-8beb-4fd086eade2e/images/a084fa36-0f93-45c2-a323-ea9ca2d16677/55b3eac5-05b2-4bae-be50-37cde7050697

A strace -p of the pid shows a slow progression to reach the effective size.

lseek(11, 3056795648, SEEK_DATA)        = 3056795648
lseek(11, 3056795648, SEEK_HOLE)        = 13407092736
lseek(14, 128637468672, SEEK_DATA)      = 128637468672
lseek(14, 128637468672, SEEK_HOLE)      = 317708828672
lseek(14, 128646250496, SEEK_DATA)      = 128646250496
lseek(14, 128646250496, SEEK_HOLE)      = 317708828672
lseek(14, 128637730816, SEEK_DATA)      = 128637730816
lseek(14, 128637730816, SEEK_HOLE)      = 317708828672
lseek(14, 128646774784, SEEK_DATA)      = 128646774784
lseek(14, 128646774784, SEEK_HOLE)      = 317708828672
lseek(14, 128646709248, SEEK_DATA)      = 128646709248

The process take a single full core, but i don't think this is the problem. The 
I/O is almost nothing.

Any idea/suggestion?

Thank you for your time
Regards
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