Mix HDDs and SSDs togheter

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Hi all,

Does anyone run a production cluster with a modified crush map for create two pools belonging one to HDDs and one to SSDs.
What’s the best method? Modify the crush map via ceph CLI or via text editor? 
Will the modification to the crush map be persistent across reboots and maintenance operations?
There’s something to consider when doing upgrades or other operations or different by having “original” crush map?

Thank you
Matteo
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