On 2020-09-21 21:12, Wout van Heeswijk wrote:
Hi Rene,
Yes, cephfs is a good filesystem for concurrent writing. When using CephFS with ganesha you can even scale out.
It will perform better but why don't you mount CephFS inside the VM?
^^ This. But it depends on the VMs you are going to use as clients. Do you trust those clients enough that they are allowed to be part of your cluster. Clients are really part of the cluster, at least that is how I see it. If possible, you want to use modern (5.7, 5.8) linux kernels for cephfs (rm operations: is slower on 4.15/5.3/5.4 for files created with 5.3/5.4 kernel). We have issues (sometimes) with older kernel clients (Ubuntu xenial, 4.15 kernel) and "MDS messages client failed to rdlock") but we don't have 100% proof yet it is because of this kernel version. They generally fix themselves though, so not a big issue. Gr. Stefan