Re: How to use ruleset

[Wido den Hollander <wido@widodh.nl>]

On 09/17/2012 11:42 AM, hemant surale wrote:
> Hi Community,
>
>           I have read the documentation to know crush map as well as
> inserting new crushmap, But I have qn that even after writing own rule
> for data placement how we can apply it for data placement? in short
> how to utilize newly specified rule when new data insertion is
> executed.
>

Every rule has a "ruleset" ID which is an integer, like:

rule data {
         ruleset 0
         ...
         ...
}

Every pool has an attribute called "crush_ruleset 0".

So if you change the ruleset in the crushmap it will re-distribute all 
the data according to the new rule. New data will be placed according to 
this new ruleset.

If you created a NEW ruleset you should create a new pool like this:

$ rados mkpool mynewpool 0 4

See --help for more information.

This should however get you going.

Wido

>          Currently I am using "rados -p <poolname> put/get Objname
> filename" cmd to put/get data into ceph.
>
> Thanks for helping me out till now.
>
>
>
> Regards,
> Hemant Surale.
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