Hi,

this solved my problem! I forgot the permissions on the cache pool

Best
Robert

-----Ursprüngliche Nachricht-----
Von: Kees Meijs <[email protected]> 
Gesendet: Montag, 16. September 2019 13:21
An: Eikermann, Robert <[email protected]>; Fyodor Ustinov <[email protected]>; 
Wido den Hollander <[email protected]>
Cc: [email protected]
Betreff: Re: [ceph-users] Re: Activate Cache Tier on Running Pools

Hi Robert,

As long as you triple-check permissions on the cache tier (should be the same 
as your actual storage pool) you should be fine.

In our setup I applied this a few times. The first time I made the assumption 
permissions would be inherited or not applicable but IOPs get redirected 
towards the tier and therefore permissions should be sane. It stopped all IOPs 
until I removed the overlay again. But alas; some VMs died already.

Later on I extra checked the permissions and all was well.

K.

On 16-09-2019 13:12, Eikermann, Robert wrote:
> That would be the case for me. I think all data during one day would fit into 
> the cache, and we could slowly flush back over night (or even over the 
> weekend). But my impression is, I would have to test it. So my initial 
> question: Do I have to stop all VMs before activating the cache? And restart 
> one by one with the cache enabled?

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