23 Jul
2020
23 Jul
'20
7:21 p.m.
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?
24 Jul
24 Jul
3:36 p.m.
New subject: What affection to vm with Monitor down
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(a)teamsun.com.cn> 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?
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Zhenshi Zhou -
展荣臻（信泰）