Thank you Gregor for the reply. I have read that page. It does say what a Crush map is and how it’s used by monitors and OSDs, but does not say how or where the map is stored in the system. Is it replicated on all OSD, vis a distributed hidden pool? Is it stored on the local linux disk of the host operating system on which the monitor daemons run? -Ed -Ed > On Aug 3, 2020, at 4:43 PM, Gregor Krmelj <gregor@xxxxxxxxxx> wrote: > > > The CRUSH map makes up the so called "Cluster Map", for which the Ceph Monitors maintain a master copy. This is precisely why you have multiple monitors - for high availability in case a monitor goes down. > > This is all explained quite well in the architecture documentation: https://docs.ceph.com/docs/master/architecture/#cluster-map. > > Regards, > G. > >> On Mon, Aug 3, 2020, at 2:01 PM, Edward kalk wrote: >> The metadata that tells CEPH where all data is located, my understanding is the crush map. Where is it stored, is it redundantly distributed so as to protect from node failure? What safeguards the critical cluster metadata? >> >> -Ed >> _______________________________________________ >> ceph-users mailing list -- ceph-users@xxxxxxx >> To unsubscribe send an email to ceph-users-leave@xxxxxxx >> > _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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