> Op 25 oktober 2017 om 10:39 schreef koukou73gr <koukou73gr@xxxxxxxxx>: > > > On 2017-10-25 11:21, Wido den Hollander wrote: > > > >> Op 25 oktober 2017 om 5:58 schreef Christian Sarrasin <c.nntp@xxxxxxxxxxxxxxxxxx>: > >> > >> The one thing I'm still wondering about is failure domains. With > >> Filestore and SSD-backed journals, an SSD failure would kill writes but > >> OSDs were otherwise still whole. Replacing the failed SSD quickly would > >> get you back on your feet with relatively little data movement. > >> > > > > Not true. If you loose your OSD's journal with FileStore without a clean shutdown of the OSD you loose the OSD. You'd have to rebalance the complete OSD. > > Could you crosscheck please? Because this > http://ceph.com/geen-categorie/ceph-recover-osds-after-ssd-journal-failure/ > suggests otherwise. > It seems to suggest, but that's wrong. Think of it this way: What good would the journal be if you can discard it without loosing anything? When a OSD shuts down cleanly it flushes the FileStore journal. At that moment you can indeed replace the journal and create a new one. But otherwise the OSD is inconsistent and will not start. Wido > -K. > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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