upmap+assimilate-conf clarification

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Hi,

I've successfully updated my luminous lab environment to nautilus so next week I'll give a try to the prod env but 2 things same up in the description:


  1.  Upmap: I've never used this before don't know how I couldn't see it because it is quite cool feature. So ceph says let it in upmap, my question is like with the ceph-pg autoscaler module not the best thing to use in 'on' mode, better in warn, so is it good to use in upmap mode let's say in ceph world "safe"?
  2.  Regarding this assimilate-conf. It's not clear for me what is it actually? Doc says:

"This is also a good time to fully transition any config options in ceph.conf into the cluster's configuration database. On each host, you can use the following command to import any option into the monitors with ceph config assimilate-conf -i /etc/ceph/ceph.conf".

What does this mean? If I have different configs on different servers and I run it on the servers it will merge it together all the configs? Or what I can do with this feature?

Thank you

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