24 May
2021
24 May
'21
7:14 p.m.
For upmap, you can see all the upmap items in your osdmap via `ceph
osd dump | grep upmap` pg autoscaler and upmap are 2 different things.
Upmaps are used mainly by the ceph balancer (if in upmap mode) to
provide a better data distribution among your OSDs. You can also
manually set upmaps. The auto-scaler is used to dynamically add/remove
PGs on pools based on the size of your cluster and the amount of data
in your pools so they are somewhat complimentary.
I believe assimilate-conf will just read your local ceph.conf and add
the config to the centralized conf. If you have different configs on
different servers there's going to be some manual work involved as
they will overwrite each other on import. Iirc you can use something
like `ceph config set <crush_bucket_type>:<crush_bucket_name>
<osd|mon|global|...> <options> <value>` to apply a config option to a
subset of OSDs.
On Fri, May 21, 2021 at 2:08 AM Szabo, Istvan (Agoda)
<Istvan.Szabo(a)agoda.com> wrote:
>
> 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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