Re: [ceph-users] Help with setting device-class rule on pool without causing data to move

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On Sun, 30 Dec 2018, David C wrote:
> Hi All
> I'm trying to set the existing pools in a Luminous cluster to use the hdd
> device-class but without moving data around. If I just create a new rule
> using the hdd class and set my pools to use that new rule it will cause a
> huge amount of data movement even though the pgs are all already on HDDs.
> There is a thread on ceph-large [1] which appears to have the solution but
> I can't get my head around what I need to do. I'm not too clear on which
> IDs I need to swap. Could someone give me some pointers on this please?
> [1]

This is a new feature in crushtool in master that will be included in 
nautilus. You can either wait, or you can just build nautilus from source 
(or grab a recent package from and use the crushtool CLI  
to update your crushmap.


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