Re: Testing a hypothetical crush map

[David Majchrzak <david@xxxxxxxxxxx>]

Hi Andras,

From what I can tell you can run crushtool with --test

http://docs.ceph.com/docs/master/man/8/crushtool/

http://cephnotes.ksperis.com/blog/2015/02/02/crushmap-example-of-a-hierarchical-cluster-map

David Majchrzak

CTO
ODERLAND Webbhotell AB

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On aug 6 2018, at 1:56 pm, Andras Pataki <apataki@xxxxxxxxxxxxxxxxxxxxx> wrote:

Hi cephers,

Is there a way to see what a crush map change does to the PG mappings

(i.e. what placement groups end up on what OSDs) without actually

setting the crush map (and have the map take effect)?  I'm looking for

some way I could test hypothetical crush map changes without any effect

on the running system.

Andras

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