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_xt@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-leave@ceph.io
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