Re: PGs get placed in the same datacenter (Trying to make a hybrid NVMe/HDD pool with 6 servers, 2 in each datacenter)

Peter Linder <peter.linder@xxxxxxxxxxxxxx> · Sat, 7 Oct 2017 21:31:25 +0200



    Yes, I realized that, I updated it to
      3.

      
      On 10/7/2017 8:41 PM, Sinan Polat wrote:

    
      You are talking about the min_size, which should be 2
        according to your text.
      

      Please be aware, the min_size in your
        CRUSH is _not_ the replica size. The replica size is set with
        your pools.

      
        Op 7 okt. 2017 om 19:39 heeft Peter Linder <peter.linder@xxxxxxxxxxxxxx> het
        volgende geschreven:

        
          On 10/7/2017 7:36 PM,
            Дробышевский, Владимир wrote:

          
            Hello!

              
                2017-10-07 19:12 GMT+05:00
                  Peter Linder <peter.linder@xxxxxxxxxxxxxx>:
                

                  The
                    idea is to select an nvme osd, and

                    then select the rest from hdd osds in different
                    datacenters (see crush

                    map below for hierarchy). 

                    
                  It's a little bit aside of the question, but why
                    do you want to mix SSDs and HDDs in the same pool?
                    Do you have read-intensive workload and going to use
                    primary-affinity to get all reads from nvme?
                   
                
          Yes, this is pretty much the idea, getting the performance
          from NVMe reads, while still maintaining triple redundancy and
          a reasonable cost. 

          
              -- 

                
                      Regards,
                      Vladimir
                    
                  
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