[linux-lvm] lvm limitations

[Gionatan Danti]

Il 2020-09-15 23:47 Zdenek Kabelac ha scritto:
> You likely don't need such amount of 'snapshots' and you will need to
> implement something to remove snapshot without need, so i.e. after a
> day you will keep maybe 'every-4-hour' and after couple days maybe
> only a day-level snapshot. After a month per-week and so one.

Agree. "Snapshot-thinning" is an essential part of snapshot management.

> 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?

Regards.

-- 
Danti Gionatan
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