Re: Minimal MDS for CephFS on OSD hosts

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hi,


> Am 19.06.2018 um 20:40 schrieb Steffen Winther Sørensen <stefws@xxxxxxxxx>:
> 
> 
> 
>> Den 19. jun. 2018 kl. 16.50 skrev Webert de Souza Lima <webert.boss@xxxxxxxxx>:
>> 
>> Keep in mind that the mds server is cpu-bound, so during heavy workloads it will eat up CPU usage, so the OSD daemons can affect or be affected by the MDS daemon.
>> But it does work well. We've been running a few clusters with MON, MDS and OSDs sharing the same hosts for a couple of years now.
> We’re also running mds on the osd hosts but again we only run vm backup on cephfs.

we need it to replace the Synology NFS cluster. Also we want share the files between two datacenter (dark fiber with 10Gbit)  (but keep both Ceph clusters separate). So I think, we put three MDS in VMs on our Proxmox VM cluster (5 nodes) with a bit RAM and check, if it is reliable.
Its much more complicated to have a shared storage for "legacy" systems, than we thought :-) Also RadosGW with NFS is on Debian Stretch not the first choice, as NFS does not has the features, we need (or my Google was to old).

cu denny
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