Dne 16. 09. 20 v 0:26 Gionatan Danti napsal(a):
Il 2020-09-15 23:47 Zdenek Kabelac ha scritto:
Speaking of thin volumes - there can be at most 2^24 thin devices
(this is hard limit you've ask for ;)) - but you have only ~16GiB of
metadata to store all of them - which gives you ~1KiB of data per such
volume -
quite frankly this is not too much - unless as said - your volumes
are not changed at all - but then why you would be building all this...
That all said - if you really need that intensive amount of snapshoting,
lvm2 is likely not for you - and you will need to build something on your own,
as you will need way more efficient and 'targeted' solution for your purpose.
Thinvols are not activated by default - this means it should be not a big
problem managing some hundreds of them, as the OP ask. Or am I missing something?
Hundreds should be 'fine' - but hundred thousands does mean the lvm2 metadata
will reach GiB range - and this is definitely NOT fine ;) - since you would
probably need around way more RAM to even manages this ;) and I'm not talking
about some places with O^2 complexity in the lvm2 code...
The metadata format is simply not going to fly here...
Zdenek
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