Hi cephers, I'm designing a new "production-like" Ceph cluster, but I've run into an issue. I have 4 nodes with 1 disk for OS, 3 disks for OSDs on each node. However, I only have 2 extra disks for use of OSD journals.
My first question is if it is possible to use a remote disk partition (currently using NBD) for OSD journals on nodes that don't have access to a local disk for journaling. I've run into some problems getting Ceph to recognize the NBD disks as block-devices during ceph-deploy osd activate. If it is possible, would this be a good design? I think we might run into some performance issues using a network journal for some OSDs. If it isn't recommended, should I use partitions of my OS disk on 2 of my nodes for a journal until I can get some more disks for journals? I imagine this would be better than storing the journal on the same disk as an OSD. Thanks, Dan
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