On 9/25/19 6:52 PM, Nathan Fish wrote: > You don't need more mons to scale; but going to 5 mons would make the > cluster more robust, if it is cheap for you to do so. > If you assume that 1 mon rebooting for updates or maintenance is > routine, then 2/3 is vulnerable to one failure. 4/5 can survive an > unexpected additional failure while one is down for maintenance. > Considering your scale, this improvement in uptime might be worthwhile. >
I second that. Exactly my thoughts as you can survive longer with a failing MON. I even recommend this for smaller clusters. 5 MONs can tolerate a MON failure when one is already down for maintenance for example. It's about getting the most nines behind 99,XXX% of uptime. Clients 'randomly' connect to one of the Monitors. So more Monitors allow you to scale to a larger number of clients, but I don't think there is data on how many clients is too much for a single MON. Wido > On Wed, Sep 25, 2019 at 10:26 AM 展荣臻（信泰） <zhanrzh...@teamsun.com.cn> wrote: >> >> >> hi all: >> I have a production cluster, and it had 24 hosts (528 osds,3mons) at a >> former. >> Now we want to add 36 hosts so the osd increase to 1320 . >> does the monitor need to increase?how many numbers of monitor node is >> recommended? >> Another question is which monitor does monclient commnuicate with? And >> how it decide? >> Any suggestions are welcome! >> _______________________________________________ >> ceph-users mailing list -- ceph-users@ceph.io >> To unsubscribe send an email to ceph-users-le...@ceph.io > _______________________________________________ > ceph-users mailing list -- ceph-users@ceph.io > To unsubscribe send an email to ceph-users-le...@ceph.io > _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io
