Ceph

We created stretch cluster with 6 nodes , 4 disks in each

Rule is working only on 3 or 4 replicas

rule StretchRuleReadRandom {
id 2
type replicated
step take default
step choose firstn 0 type datacenter
step chooseleaf firstn 2 type host
step emit
}

This rule is not working

rule W1 {
id 3
type replicated
step take W1
step chooseleaf firstn 0 type host
step emit
}

ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF
-1 11.71912 root default
-19 5.85956 datacenter W1
-3 1.95319 host ceph-w1-01
0 ssd 0.48830 osd.0 up 1.00000 1.00000
1 ssd 0.48830 osd.1 up 1.00000 1.00000
2 ssd 0.48830 osd.2 up 1.00000 1.00000
23 ssd 0.48830 osd.23 up 1.00000 1.00000
-7 1.95319 host ceph-w1-02
3 ssd 0.48830 osd.3 up 1.00000 1.00000
4 ssd 0.48830 osd.4 up 1.00000 1.00000
5 ssd 0.48830 osd.5 up 1.00000 1.00000
6 ssd 0.48830 osd.6 up 1.00000 1.00000
-10 1.95319 host ceph-w1-03
7 ssd 0.48830 osd.7 up 1.00000 1.00000
8 ssd 0.48830 osd.8 up 1.00000 1.00000
9 ssd 0.48830 osd.9 up 1.00000 1.00000
10 ssd 0.48830 osd.10 up 1.00000 1.00000
-20 5.85956 datacenter W2
-13 1.95319 host ceph-w2-01
11 ssd 0.48830 osd.11 up 1.00000 1.00000
12 ssd 0.48830 osd.12 up 1.00000 1.00000
13 ssd 0.48830 osd.13 up 1.00000 1.00000
14 ssd 0.48830 osd.14 up 1.00000 1.00000
-16 1.95319 host ceph-w2-02
15 ssd 0.48830 osd.15 up 1.00000 1.00000
16 ssd 0.48830 osd.16 up 1.00000 1.00000
17 ssd 0.48830 osd.17 up 1.00000 1.00000
18 ssd 0.48830 osd.18 up 1.00000 1.00000
-25 1.95319 host ceph-w2-03
19 ssd 0.48830 osd.19 up 1.00000 1.00000
20 ssd 0.48830 osd.20 up 1.00000 1.00000
21 ssd 0.48830 osd.21 up 1.00000 1.00000
22 ssd 0.48830 osd.22 up 1.00000 1.00000