With a RACK failure domain, you should be able to have an entire rack powered down without noticing any major impact on the clients. I regularly take down OSDs and nodes for maintenance and upgrades without seeing any problems with client IO.
On Tue, Feb 12, 2019 at 5:01 AM M Ranga Swami Reddy <swamireddy@xxxxxxxxx> wrote:
Hello - I have a couple of questions on ceph cluster stability, even
we follow all recommendations as below:
- Having separate replication n/w and data n/w
- RACK is the failure domain
- Using SSDs for journals (1:4ratio)
Q1 - If one OSD down, cluster IO down drastically and customer Apps impacted.
Q2 - what is stability ratio, like with above, is ceph cluster
workable condition, if one osd down or one node down,etc.
Thanks
Swami
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