Creating CRUSH rules for replicated pools

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Use this information to create a CRUSH rule for a replicated pool from the command-line.

To create a CRUSH rule for a replicated pool, run the following:

Syntax 

ceph osd crush rule create-replicated NAME ROOT FAILURE_DOMAIN CLASS

Where:

  • <name>: The name of the rule.

  • <root>: The root of the CRUSH hierarchy.

  • <failure-domain>: The failure domain. For example: host or rack.

  • <class>: The storage device class. For example: hdd or ssd.

Example 

[ceph: root@host01 /]# ceph osd crush rule create-replicated fast default host ssd