CRUSHMAP for chassis balance

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Dear cepher,

Currently I am working on crushmap to try to make sure the at least one copy are going to different chassis.

Say chassis1 has host1,host2,host3, and chassis2 has host4,host5,host6.

 

With replication =2, it’s not a problem, I can use the following step in rule

step take chasses1

step chooseleaf firstn 1 type host

step emit

step take chasses2

step chooseleaf firstn 1 type host

step emit

 

But for replication=3, I tried

step take chasses1

step chooseleaf firstn 1 type host

step emit

step take chasses2

step chooseleaf firstn 1 type host

step emit

step take default

step chooseleaf firstn 1 type host

step emit

 

At the end, the 3rd osd returned in rule test is always duplicate with first 1 or first 2.

 

Any idea or what’s the direction to move forward?

Thanks in advance

 

BR,

Luke

MYCOM-OSI

 




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