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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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