[Btrfs-devel] Is crc32 adequate to detect real-life data corruption in filesystem's blocks?

[Chris Mason]

On Mon, 7 Jan 2008 12:29:46 +0600
sftf <sftf-misc at mail.ru> wrote:

> What about multiple errors detection with crc32?
> Is it work?

This will depend on who you ask.  Over the long term, btrfs will
support a number of stronger checksums for metadata and data.

There are 256 bits reserved in the metadata blocks, and the file data
checksums don't require a fixed size, so it will be possible to have
different sized checksums on different files.

In practice, 32 bit crcs are a good tradeoff between performance and
safety.  Some people will surely want better, and we'll examine other
algorithms as the FS matures.

-chris