Thanks for your comments, Sake and David.
Depending on the customer's budget we'll then either run some tests
with the documented stretch mode or build our own stretch mode in
"legacy" style by creating a suitable crush rule.
Thanks!
Eugen
Zitat von Sake Ceph <ceph@xxxxxxxxxxx>:
I believe they are working on it or want to work on it to revert
from a stretched cluster, because of the reason you mention: if the
other datacenter is totally burned down, you maybe want for the time
being switch to one datacenter setup.
Best regards,
Sake
Op 09-11-2023 11:18 CET schreef Eugen Block <eblock@xxxxxx>:
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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