[ceph-users] Re: Live migrate RBD image with a client using it

2023-04-13 Thread Nelson Hicks
For KVM virtual machines, one of my coworkers worked out a way to live migrate a VM with its storage to another node on the same cluster with storage in a different pool. This requires that the VM can be live migrated to a new host that has access to the same Ceph cluster, and enough bandwidth

[ceph-users] Re: Live migrate RBD image with a client using it

2023-04-13 Thread Anthony D'Atri
I've used a similar process with great success for capacity management -- moving volumes from very full clusters to ones with more free space. There was a weighting system to direct new volumes where there was space, but, to forestall full ratio problems due to organic growth of existing

[ceph-users] Re: Live migrate RBD image with a client using it

2023-04-13 Thread Burkhard Linke
Hi, On 4/12/23 19:09, Work Ceph wrote: Exactly, I have seen that. However, that also means that it is not a "process" then, right? Am I missing something? If we need a live process, where the clients cannot unmpa the volumes, what do you guys recommend? We have performed a "live migration"

[ceph-users] Re: Live migrate RBD image with a client using it

2023-04-12 Thread Work Ceph
Exactly, I have seen that. However, that also means that it is not a "process" then, right? Am I missing something? If we need a live process, where the clients cannot unmpa the volumes, what do you guys recommend? On Wed, Apr 12, 2023 at 10:01 AM Eugen Block wrote: > Hi, > > the docs you

[ceph-users] Re: Live migrate RBD image with a client using it

2023-04-12 Thread Eugen Block
Hi, the docs you mentioned also state: All clients using the source image must be stopped prior to preparing a live-migration. The prepare step will fail if it finds any running clients with the image open in read/write mode. Once the prepare step is complete, the clients can be restarted