Re: Need help with btrfs.

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On Wed, Mar 03, 2021 at 04:57:28PM -0700, Chris Murphy wrote:
> It works at the block level. A block is read, checksum calculated and
> compared to the previously recorded checksum for the block. It doesn't
> know what it's reading, not even whether it's compressed or not. It
> just becomes a stream of blocks without respect to the file or
> subvolume. If there's a mismatch, then it does a lookup to find out
> the owner: what subvolume/snapshot and filename/inode, what offset,
> and so on - which is then how it figures out where the good copy is
> (if any) and does self-healing. It pretty much runs at device max read
> capability.

So given this, even with atimes there's only a write in the case where
there's a mismatch, right?

-- 
Matthew Miller
<mattdm@xxxxxxxxxxxxxxxxx>
Fedora Project Leader
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