Isn't this somewhat reliant on the OSD type? Redhat/Micron/Samsung/Supermicro have all put out white papers backing the idea of 2 copies on NVMe's as safe for production. From: "Magnus HAGDORN" <Magnus.Hagdorn@ed.ac.uk> To: pseudo@avalon.org.ua Cc: "ceph-users" <ceph-users@ceph.io> Sent: Wednesday, February 3, 2021 4:43:08 AM Subject: [ceph-users] Re: Worst thing that can happen if I have size= 2 On Wed, 2021-02-03 at 09:39 +0000, Max Krasilnikov wrote:
if a OSD becomes unavailble (broken disk, rebooting server) then all I/O to the PGs stored on that OSD will block until replication level of 2 is reached again. So, for a highly available cluster you need a replication level of 3
AFAIK, with min_size 1 it is possible to write even to only active OSD serving
yes, that's correct but then you seriously risk trashing your data The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336. _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-leave@ceph.io