The rbd has 2 kinds of data, metadata and data itself, the
metadata gives information about the rbd imagen and small amounts
of internal information. This one is place on the replicated pool
and that's why it's considering that the image is on the
replicated pool.
But the actual data (big information) are stored in the
Erasure pool.
So when you start filling your image you will see how your
replicated metadata pool grows a little bit when the actual
Erasure data pool grows way more!
You can get information about your image using rbd info
{replicated pool}/{image name}
-------- Mensaje original --------
Fecha: 12/10/17 8:40 PM (GMT+01:00)
Asunto: Re: Erasure coding with RBD
Thank you for your reply.
I created a erasure coded pool 'ecpool' and a replicated pool
to store metadata 'ec_rep_pool'
And created image as you mentioned :
rbd create --size 20G --data-pool ecpool
ec_rep_pool/ectestimage1
But the image seems to be created in ec_rep_pool
============
[cephuser@ceph-las-admin-a1 ceph-cluster]$ rbd ls -l ecpool
[cephuser@ceph-las-admin-a1 ceph-cluster]$ rbd ls -l ec_rep_pool
NAME SIZE
PARENT
FMT PROT LOCK
ectestimage
20480M
2
ectestimage1
20480M
2
Is that how it suppose to work ?
On 12-10-2017 23:53, David Turner
wrote:
The image
metadata still needs to live in a replicated data pool --
only the data blocks can be stored in an EC pool. Therefore,
when
creating the image, you should provide the "--data-pool
<pool-name>"
optional to specify the EC pool name.
On Thu, Oct 12, 2017 at 2:06 PM, Josy <josy@xxxxxxxxxxxxxxxxxxxxx>
wrote:
> Hi,
>
> I am trying to setup an erasure coded pool with rbd
image.
>
> The ceph version is Luminous 12.2.1. and I understand,
since Luminous, RBD
> and Cephfs can store their data in an erasure coded
pool without use of
> cache tiring.
>
> I created a pool ecpool and when trying to create a rbd
image, gets this
> error.
>
> ==============
>
> [cephuser@ceph-las-admin-a1 ceph-cluster]$ rbd create
--size 20G
> ecpool/ectestimage2
> 2017-10-12 10:55:37.992965 7f18857fa700 -1
librbd::image::CreateRequest:
> 0x55608e1e0c20 handle_add_image_to_directory: error
adding image to
> directory: (95) Operation not supported
> rbd: create error: (95) Operation not supported
> ==============
>
>
>
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> ceph-users@xxxxxxxxxxxxxx
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--
Jason
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