Re: Erasure coding with RBD

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Thank you all!


On 13-10-2017 00:19, Jorge Pinilla López wrote:
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:

On Thu, Oct 12, 2017 at 2:09 PM Jason Dillaman <jdillama@xxxxxxxxxx> 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
> ==============
>
>
>
> _______________________________________________
> ceph-users mailing list
> ceph-users@xxxxxxxxxxxxxx
> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com



--
Jason
_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com


_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com

[Index of Archives]     [Information on CEPH]     [Linux Filesystem Development]     [Ceph Development]     [Ceph Large]     [Ceph Dev]     [Linux USB Development]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [xfs]


  Powered by Linux