Hello, we do not see a problem in a small cluster having 3 MON on OSD hosts. However we do suggest to use 5 MON's. Near every customers of us does this without a problem! Please just make sure to have enough cpu/ram/disk available. So: 1. No not necessary, only if you want to spend more money than required. 2. Maybe think of it when your cluster becomes >500, maybe 1k OSDs or simply if the cluster design would be easier with dedicated servers. Hint: Our training's cover a Ceph cluster planing session that covers exactly such topics. See https://croit.io/training. -- Martin Verges Managing director Mobile: +49 174 9335695 E-Mail: martin.verges@xxxxxxxx Chat: https://t.me/MartinVerges croit GmbH, Freseniusstr. 31h, 81247 Munich CEO: Martin Verges - VAT-ID: DE310638492 Com. register: Amtsgericht Munich HRB 231263 Web: https://croit.io YouTube: https://goo.gl/PGE1Bx Am Mo., 17. Dez. 2018 um 10:10 Uhr schrieb Sam Huracan <nowitzki.sammy@xxxxxxxxx>: > > Hi everybody, > > We've runned a 50TB Cluster with 3 MON services on the same nodes with OSDs. > We are planning to upgrade to 200TB, I have 2 questions: > 1. Should we separate MON services to dedicated hosts? > 2. From your experiences, how size of cluster we shoud consider to put MON on dedicated hosts? > > > Thanks in advance. > > > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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