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Re: MBR partitioning, and content after partition table but before first partition


On Mon, Mar 13, 2017 at 08:36:59PM -0700, David Christensen wrote:
> Is anyone aware of a utility that can walk a file system and replace
> identical files with hard links?

As an alternative to doing this, you could consider using a
filesystem with block-level de-duplication support.

ZFS and btrfs can do this online, though that uses a very large
amount of memory. btrfs and recently XFS can do it offline, which
means that you trigger it at a time of your choosing.

Support in XFS only arrived in kernel version 4.9.1, and is still
marked as experimental. The kernel in jessie-backports right now is
new enough. I did a write up a while ago about experimenting with
this in XFS:



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