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Published 20 hours ago • verified publisher icon xetys

install rook with 3 replicas default

Open xetys opened this issue 6 years ago • 2 comments

from the comment in #17

I forgot that for the very most storage cloud solution you need to replicate to 3, to ensure real failover behavior...

this is already did for OpenEBS, but not rook.

xetys avatar Mar 07 '18 18:03 xetys

Please define "need".

Are you saying that if there are two replicas, and one fails, the filesystem will stop working?

Baughn avatar Mar 08 '18 23:03 Baughn

sry for the delay.

the basic fault tolerance is if N/2 nodes are working. With 2 replicas there is a high risk of data lost of unavailability. With OpenEBS you cannot write to a disk if only 1 of 2 is up.

As of rook, my latest number from a ceph expert was "at least 4 replicas to get sure no data gets lost". So 2 is definitely to low. You have always keep in mind that most people don't think about configurations and take stuff as it is.

xetys avatar Mar 26 '18 14:03 xetys