Re: Copy RBD image from replicated to erasure pool possible?

[Caspar Smit <casparsmit@xxxxxxxxxxx>]

Hi all,

Allthough undocumented, i just tried:

"rbd -p rbd copy disk1 disk1ec --data-pool ecpool"

And it worked! :)

The copy is now on the erasure coded pool.

Kind regards,

Caspar

2017-12-18 22:32 GMT+01:00 Caspar Smit <casparsmit@xxxxxxxxxxx>:

Hi all,

http://ceph.com/community/new-luminous-erasure-coding-rbd-cephfs/

Since it is possible in Luminous to use RBD directly on erasure coded pools the question arises how i can migrate an RBD image from a replicated pool to an erasure coded pool.

I've got two pools configured, one replicated pool named rbd and an erasure coded pool named ecpool

The rbd pool stores a 100GB rbd image called 'disk1'

i've created a 'destination' rbd image in the erasure coded pool called 'disk1ec' using:

rbd -p rbd create --size 100G --data-pool ecpool disk1ec

I've tried: rbd -p rbd copy disk1 disk1ec

but that fails with:

librbd: rbd image disk1ec already exists

Which is obvious because the docs says the copy command will create the destination rbd image.

When i don't create the disk1ec image first and do a rbd copy the result is just another rbd image in the replicated pool.

So how would i copy (or move) the rbd image from replicated to erasure? Is there maybe a flag to the copy command to specify the data_pool for the destination? 

Kind regards and thanks in advance for any advice,
Caspar

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