On 17-03-03 12:30, Matteo Dacrema wrote:
Hi All,
I’ve a production cluster made of 8 nodes, 166 OSDs and 4 Journal SSD
every 5 OSDs with replica 2 for a total RAW space of 150 TB.
I’ve few question about it:
* It’s critical to have replica 2? Why?
Replica size 3 is highly recommended. I do not know exact numbers but it
decreases chance of data loss as 2 disk failures appear to be quite
frequent thing, especially in larger clusters.
* Does replica 3 makes recovery faster?
no
* Does replica 3 makes rebalancing and recovery less heavy for
customers? If I lose 1 node does replica 3 reduce the IO impact
respect a replica 2?
no
* Does read performance increase with replica 3?
no
Thank you
Regards
Matteo
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