Re: the fault domain setting of the daos container

Lombardi, Johann

Hi there,


There is a gap in the support of rf_lvl which is not used by the placement algorithm yet. Please see to track progress on this.





From: <> on behalf of "dagouxiong2015@..." <dagouxiong2015@...>
Reply-To: "" <>
Date: Thursday 24 March 2022 at 05:02
To: "" <>
Subject: [daos] the fault domain setting of the daos container


Hello everyone:

Recently, I am studying the fault domain setting of the daos container, hoping to deploy multiple engines on a single physical node,

and the data of the object is distributed on different physical nodes , prevent the failure of a single physical node to cause data loss.

But when I configure

[root@server-1 ~]# daos cont create pool --label cont12 --type POSIX --properties rf:1  --properties rf_lvl:0

ERROR: daos: "rf_lvl" is not a settable property (valid: cksum,cksum_size,compression,dedup,dedup_threshold,ec_cell,encryption,label,rf,srv_cksum,status)

Code analysis can only support one fault
domain (by rank) layout.


 * Level of fault-domain to use for object allocation

 * rank is hardcoded to 1, [2-254] are defined by the admin


enum {

        DAOS_PROP_CO_REDUN_MIN        = 1,

        DAOS_PROP_CO_REDUN_RANK        = 1, /** hard-coded */

        DAOS_PROP_CO_REDUN_MAX        = 254,



In the current situation, if you want data redundancy on different physical nodes, do you have any good suggestions?

Does daos plan to support configurable in fault domain in the future?


Best regards!

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