[linux-lvm] Thin metadata volume bigger than 16GB ?

Gionatan Danti g.danti at assyoma.it
Sat Jun 23 10:14:48 UTC 2018

Il 22-06-2018 22:13 Zdenek Kabelac ha scritto:
> Addressing is internally limited to use lower amount of bits.
> Usage of memory resources, efficiency.
> ATM we do not recommend to use cache with more then 1.000.000 chunks
> for better efficiency reasons although on bigger machines bigger
> amount of chunks are still quite usable especially now with cache
> metadata format 2.

Does it means that with a 64 KB cache chunk size I can efficiently cache 
only up to 64 KB * 1000000 = ~60 GB volume?
So for, say, a 64 TB volume do I need to use 64 MB cache chunks?

> ATM drop data you don't need  (fstrim filesystem).
> So far there were not many request to support bigger size although
> there are plans to improve thin-pool metadata format for next version.
> Regards
> Zdenek

Extremely informative answer, thanks a lot.

Danti Gionatan
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