Hi,
I'd like to ask for confirmation how I understand the docs on stretch
mode [1]. It requires exact size 4 for the rule? Other sizes are not
supported/won't work, for example size 6? Are there clusters out there
which use this stretch mode?
Once stretch mode is enabled, it's not possible to get out of it. How
would one deal with a burnt down datacenter which can take months to
rebuild? In a "self-managed" stretch cluster (let's say size 6) I
could simply change the crush rule to not consider the failed
datacenter anymore, deploy an additional mon somewhere and maybe
reduce the size/min_size. Am I missing something?
Thanks,
Eugen
[1] https://docs.ceph.com/en/reef/rados/operations/stretch-mode/#id2
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