Hello, I'm experimenting with ceph for caching, it's configured with size=1 (so no redundancy/replication) and exported via cephfs to clients, now I'm wondering what happens is an SSD dies and all of its data is lost? I'm seeing files being in 4MB chunks in PGs, do we know if a whole file as saved through cephfs (all its chunks) are in a single PG (or at least in a multiple PGs within a single OSD), or it might be spread over multiple OSD, so in that case an SSD failure would entail effectively loosing more than data than it fits on a single drive, or even worse, massive corruption potentially affecting most of the content. Note that losing a single drive and all of its data (so 1% in case of a 100 drives) isn't an issue for me. However losing much more or files being silently corrupted with holes in them is unacceptable. I would then have to go with some erasure coding.
Thanks, Vedran _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
