Yes, you can get the OSDs back if you replace the server. In fact, in your case you might not want to bother including hosts as a distinguishable entity in the crush map; and then to "replace the server" you could hair mount the LUNs somewhere else and turn on the OSDs. You would need to set a few config options (like the one that automatically updates crush location on boot), but it shouldn't be too difficult.
More concerning is that since you're on a SAN you rely on its hardware not to fail. And depending on what controls you have you might choose to handle redundancy differently than normal. -Greg On Fri, Nov 7, 2014 at 3:42 AM Mario Giammarco <mgiamma...@gmail.com> wrote: > Hello, > I need to build a ceph test lab. > I have to do it with existing hardware. > I have several iscsi and fibre channel san but few servers. > Imagine I have: > > - 4 SAN with 1 lun on each san > - 2 diskless (apart boot disk) servers > > I mount two luns on first server and two luns on second server. > Then (I suppose) I put 4 ceph osd one on each lun. > Now if a server breaks I lose two osds. But the osd data is not lost > because > it is on disk. > My question is: if I replace the server can I use again the osds remounting > the luns on the new server? > > Thanks, > Mario > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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