Re: RBD lost parents after rados cppool

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Hi Jason,
 
This really did the trick!
I can now rescue my rbds, thank you very much!
 
Sincerely,
Craig Chi (Product Developer)
Synology Inc. Taipei, Taiwan.
 
On 2016-11-21 21:44, Jason Dillaman <jdillama@xxxxxxxxxx> wrote:
You are correct -- rbd uses the pool id as a reference and now your
pool has a new id. There was a thread on this mailing list a year ago
for the same issue [1].

[1] http://lists.ceph.com/pipermail/ceph-users-ceph.com/2015-May/001456.html

On Sun, Nov 20, 2016 at 2:19 AM, Craig Chi <craigchi@xxxxxxxxxxxx> wrote:
> Hi Cephers,
>
> I am tuning the pg numbers of my OpenStack pools.
>
> As everyone knows, the pg number of a pool can not be decreased, so I came
> up with an idea to copy my pools to new pools with lower pg_num and then
> delete the original pool.
>
> I execute following commands:
>
> rados cppool volumes new-volumes
> rados cppool images new-images
> ceph osd pool rm volumes volumes --yes-i-really-really-mean-it
> ceph osd pool rm images images --yes-i-really-really-mean-it
> ceph osd pool rename new-volumes volumes
> ceph osd pool rename new-images images
>
> But after that, when I want to query the usage of volumes by `rbd -p volumes
> du`, it returns a mass of error messages like
>
> 2016-11-20 08:01:47.126068 7fa8337fe700 -1 librbd::image::OpenRequest:
> failed to retreive name: (2) No such file or directory
> 2016-11-20 08:01:47.126119 7fa832ffd700 -1
> librbd::image::RefreshParentRequest: failed to open parent image: (2) No
> such file or directory
> 2016-11-20 08:01:47.126135 7fa832ffd700 -1 librbd::image::RefreshRequest:
> failed to refresh parent image: (2) No such file or directory
> 2016-11-20 08:01:47.126150 7fa832ffd700 -1 librbd::image::OpenRequest:
> failed to refresh image: (2) No such file or directory
>
> I think it may be caused by the change of "images" pool id, right?
>
> Is it possible to re-reference the rbds in "volumes" on new "images" pool?
> Or is it possible to change or specify the pool id of new pool?
>
> Any suggestions are very welcome. Thanks
>
> Sincerely,
> Craig Chi (Product Developer)
> Synology Inc. Taipei, Taiwan.
>
>
>
>
> Sent from Synology MailPlus
> _______________________________________________
> ceph-users mailing list
> ceph-users@xxxxxxxxxxxxxx
> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>



--   
Jason

 

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