Re: What does replica size mean?

[Sage Weil <sage@xxxxxxxxxxx>]

On Thu, 5 Jul 2012, Eric_YH_Chen@xxxxxxxxxx wrote:
> Hi, all:
> 
> Just want to make sure one thing. 
> If I set replica size as 2, that means one data with 2 copies, right?
> Therefore, if I measure the performance of rbd is 100MB/s, 
> I can imagine the actually io throughputs on hard disk is over 100MB/s *3 = 300 MB/s.  
> Am I correct? 

Right.

"pool size" => "pg size" => number of osds in each PG => number of replicas

So a pool with 'size 3' means 3x replication.

sage