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There isn't currently any way to directly move a container DB from one drive to another. As you said, the placement is based on the hash of the container name, so you can't change that.

One thing you can do is lower the weight of the drive that is very busy. This will cause less partitions to be placed there and lower the overall load on that particular drive. This is not a panacea though. The load will simply move to other hardware in the cluster. If you're lucky, then you'll have the larger container DB on a less busy drive.

I'd strongly recommend that you deploy flash storage for accounts and containers. This will help alleviate these sorts of problems, and it's generally the cheapest way for an operator to resolve these sorts of problems.

If it's possible, you should see if you can get the end-user to use many containers instead of one container. Spreading the load around the system to more containers is a best-practice for using Swift.

Longer-term, we're talking about how to scale container resources in Swift. This week at the Swift midcycle hackathon, we talked about some ideas on how to transparently shard the container DBs. However, implementing it is a large amount of work that will take a while to complete.

I hope these suggestions help.


--John




> On Aug 11, 2015, at 4:38 PM, Senthil <senthil69 at gmail.com> wrote:
> 
> Hi,
> 
> Are you currently using same disks/nodes  for container and  object storage ?
> http://docs.openstack.org/openstack-ops/content/maintenance.html
> talks about replacing storage nodes. The same instructions applies to container db as well.You need to apply the changes to container ring and push it out.  You will be able to move container db to different server or relocate container db to different disk
> 
> Hope it helps
> 
> Senthil
> 
> 
> 
> 
> 
> On Tue, Aug 11, 2015 at 2:39 PM, Jinkyung Hwang <jinkyung.hwang at kt.com> wrote:
> Hello,
> 
> Is there any method to move A container DB to another container server of different physical disk of original one ?
> 
> I have a very large container (having 70 million objects).
> This container IO makes other customer's container read/write operation very slow, so I'd like to move it to another location that is more idle.
> 
> BUT Swift URL is made with MD5 Hash and it cannot be modifiable.
> 
> How can I move the container DB ? Or is there any method to use something like 'link' ?
> 
> It would be appreciated if you share any ideas.
> 
> Thank you
> 
> Jinkyung Hwang
> 
> 
> 
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