"rbd import" so slow

[Chu Duc Minh <chu.ducminh@xxxxxxxxx>]

When using RBD backend for Openstack volume, i can easily surpass 200MB/s.

But when using "rbd import" command, eg:
# rbd import --pool test Debian.raw volume-Debian-1 --new-format --id volumes

I only can import at speed ~ 30MB/s

I don't know why rbd import slow? What can i do to improve import speed?

Thanks you very much!

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