Re: Question about CRUSH rule set parameter "min_size" "max_size"

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Hi Mika,

 

The below command will set ruleset to the pool:

 

ceph osd pool set <poolname> crush_ruleset 1

 

For more info : http://ceph.com/docs/master/rados/operations/crush-map/

 

Thanks

Sahana

 

From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of Vickie ch
Sent: Tuesday, February 03, 2015 11:30 AM
To: ceph-users
Subject: [ceph-users] Question about CRUSH rule set parameter "min_size" "max_size"

 

Hi ,

      CRUSH map have two parameter are "min_size" and "max_size".

Explanation about min_size is "If a pool makes fewer replicas than this number, CRUSH will NOT select this rule".

The max_size is "If a pool makes more replicas than this number, CRUSH will NOT select this rule"

Default setting of pool replicate size is 1.
Created 2 rules that ruleset0 「min_size = 3」, ruleset1 「min_size = 1」and applied.
Then created a new pool named "test" and assume pool "test" will apply ruleset1.

But found pool "test" apply ruleset0.

Which part I missing?

Thanks a lot for any advice!

Best wishes,

Mika




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