How many subvols/snapshots are possible? (limits?)

How many subvols/snapshots are possible? (limits?)

[Martin]

Dear Devs,

This is more a use case question of what is a good idea to do...


Can btrfs support snapshots of the filesystem at very regular intervals,
say minute by minute or even second by second?

Or are there limits that will be hit with metadata overheads or
links/reference limits or CPU overheads if 'too many' snapshots/subvols
are made?

If snapshots were to be taken once a minute and retained, what breaks first?


What are 'reasonable' (maximum) numbers for frequency and number of held
versions?


Thanks,
Martin

Re: How many subvols/snapshots are possible? (limits?)

[Harald Glatt]

I can only speak from experience, a snapshot can take up to a minute
to create later on, so minutely snapshots are out of the question
then... I have snapshots every hour and I have no problems with that
at all :)

On Thu, May 9, 2013 at 12:10 PM, Martin <m_btrfs@ml1.co.uk> wrote:
> Dear Devs,
>
> This is more a use case question of what is a good idea to do...
>
>
> Can btrfs support snapshots of the filesystem at very regular intervals,
> say minute by minute or even second by second?
>
> Or are there limits that will be hit with metadata overheads or
> links/reference limits or CPU overheads if 'too many' snapshots/subvols
> are made?
>
> If snapshots were to be taken once a minute and retained, what breaks first?
>
>
> What are 'reasonable' (maximum) numbers for frequency and number of held
> versions?
>
>
> Thanks,
> Martin
>
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