Re: Ruleset vs replica count

[Adrian Saul <Adrian.Saul@xxxxxxxxxxxxxxxxx>]

 

Yes – ams5-ssd would have 2 replicas, ams6-ssd would have 1  (@size 3, -2 = 1)

 

Although for this ruleset the min_size should be set to at least 2, or more practically 3 or 4.

 

 

From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of Sinan Polat
Sent: Friday, 25 August 2017 3:02 AM
To: ceph-users@xxxxxxxx
Subject: Ruleset vs replica count

 

Hi,

 

In a Multi Datacenter Cluster I have the following rulesets:

------------------

rule ams5_ssd {

        ruleset 1

        type replicated

        min_size 1

        max_size 10

        step take ams5-ssd

        step chooseleaf firstn 2 type host

        step emit

        step take ams6-ssd

        step chooseleaf firstn -2 type host

        step emit

}

rule ams6_ssd {

        ruleset 2

        type replicated

        min_size 1

        max_size 10

        step take ams6-ssd

        step chooseleaf firstn 2 type host

        step emit

        step take ams5-ssd

        step chooseleaf firstn -2 type host

        step emit

}

------------------

 

The replication size is set to 3.

 

When for example ruleset 1 is used, how is the replication being done? Does it store 2 replica’s in ams5-ssd and store 1 replica in ams6-ssd? Or does it store 3 replicas in ams5-ssd and 3 replicas in ams6-ssd?

 

Thanks!

 

Sinan

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