It is advisable to run an odd-number(at least 3) of monitors but not mandatory. A 2 monitor cluster can also provide service. I think it's ok to shutdown a monitor host for a while. If you are afraid of monitor down when maintaining, means that only 1 monitor is alive in the cluster which makes the cluster unavailable, I think you'd better add 1 or 2 temporary monitors to the cluster. 展荣臻（信泰） <zhanrzh_xt@xxxxxxxxxxxxxx> 于2020年7月23日周四 下午8:23写道： > Hi,everyone > Our production ceph cluster the version is hammer have 3 monitors and 300+ > osds.Monitor daemon runs on host diffrent from osd daemon. > openstack vm runs on rbd.Now we need to maintain monitor host so must > shutdown monitor host a moment, one by one. > But keep two monitor host online all the time. > What is the impact of monitor down on vm? > How to do reduce the impact? > _______________________________________________ > 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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