Crush map & rule

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Hi everyone, 

I'm totally newbie with ceph, so sorry if I'm asking some stupid question. 

I'm trying to understand how the crush map & rule work, my goal is to have
two groups of 3 servers, so I'm using “row” bucket 

ID   CLASS  WEIGHT    TYPE NAME                 STATUS  REWEIGHT  PRI-AFF
 -1         59.38367  root default
-15         59.38367      zone City
-17         29.69183          row primary
 -3          9.89728              host server1
  0    ssd   3.49309                  osd.0         up   1.00000  1.00000
  1    ssd   1.74660                  osd.1         up   1.00000  1.00000
  2    ssd   1.74660                  osd.2         up   1.00000  1.00000
  3    ssd   2.91100                  osd.3         up   1.00000  1.00000
 -5          9.89728              host server2
  4    ssd   1.74660                  osd.4         up   1.00000  1.00000
  5    ssd   1.74660                  osd.5         up   1.00000  1.00000
  6    ssd   2.91100                  osd.6         up   1.00000  1.00000
  7    ssd   3.49309                  osd.7         up   1.00000  1.00000
 -7          9.89728              host server3
  8    ssd   3.49309                  osd.8         up   1.00000  1.00000
  9    ssd   1.74660                  osd.9         up   1.00000  1.00000
 10    ssd   2.91100                  osd.10        up   1.00000  1.00000
 11    ssd   1.74660                  osd.11        up   1.00000  1.00000
-19         29.69183          row secondary
 -9          9.89728              host server4
 12    ssd   1.74660                  osd.12        up   1.00000  1.00000
 13    ssd   1.74660                  osd.13        up   1.00000  1.00000
 14    ssd   3.49309                  osd.14        up   1.00000  1.00000
 15    ssd   2.91100                  osd.15        up   1.00000  1.00000
-11          9.89728              host server5
 16    ssd   1.74660                  osd.16        up   1.00000  1.00000
 17    ssd   1.74660                  osd.17        up   1.00000  1.00000
 18    ssd   3.49309                  osd.18        up   1.00000  1.00000
 19    ssd   2.91100                  osd.19        up   1.00000  1.00000
-13          9.89728              host server6
 20    ssd   1.74660                  osd.20        up   1.00000  1.00000
 21    ssd   1.74660                  osd.21        up   1.00000  1.00000
 22    ssd   2.91100                  osd.22        up   1.00000  1.00000

and I want to create a some rules, first I like to have

  a rule «replica» (over host) inside the «row» primary
  a rule «erasure» (over host)  inside the «row» primary

but also two crush rule between primary/secondary, meaning I like to have a
replica (with only 1 copy of course) of pool from “row” primary to
secondary. 

How can I achieve that ?

Regards
  


-- 
Albert SHIH 🦫 🐸
mer. 08 nov. 2023 18:37:54 CET
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