Visualization of the min_alloc_size / wasted space dynamic:

https://docs.google.com/spreadsheets/d/1rpGfScgG-GLoIGMJWDixEkqs-On9w8nAUToPQjN8bDI/edit#gid=358760253
Bluestore Space Amplification Cheat Sheet
docs.google.com


> On Jan 16, 2023, at 3:49 AM, Frank Schilder <[email protected]> wrote:
> 
> If you have mostly small file IO and only the occasional large files, you 
> might consider having 2 data pools on HDD. One 3x-replicated pool as default 
> and an 8+2 or 8+3 EC pool for large files. You can give every user a folder 
> on the large-file pool (say "archives" under home). For data folders users 
> should tell you what it is for.


Users unfortunately are notoriously uncompliant.  With Quincy one can override 
the storage class on the RGW side:

https://www.youtube.com/watch?v=w91e0EjWD6E
Optimizing RGW Object Storage Mixed Media through Storage Classes and Lua 
Scripting
youtube.com

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