On 08/11/16 12:06, Niccolò Belli wrote:
Nice, you should probably update the btrfs wiki as well, because there
is no mention of btrfs-dedupe.
I am planning to, I had to apply for an account, which has now been
approved.
First question, why this name? Don't you plan to support xfs as well?
It didn't occur to me, to be honest. I might support XFS as well, but I
don't use it, and will possibly be adding other btrfs-specific stuff to
it. You'll notice it's part of a bigger wbs-backup repo, with other
tools, which I'm developing to manage my storage and backup requirements.
I'll take a look at it, and certainly see if it works out of the box.
Second question, I'm trying deduplication tools for the very first time
and I still have to figure out how to handle snapper snapshots, which
are read only. I currently tried duperemove 0.11 git and I get tons of
"Error 30: Read-only file system while opening
"/.../@snapshots/4385/...". How am I supposed to handle snapper snapshots?
> Is btrfs-dedupe able to handle snapper snapshots?
You can't deduplicate a read-only snapshot, but you can create
read-write snapshots from them, deduplicate those, and then recreate the
read-only ones. This is what I've done.
In theory, once this has been done once, it shouldn't have to be done
again, at least for those snapshots, unless you want to modify the
deduplication. It's probably a good idea to defragment files and
directories first, as well.
It should be possible to deduplicate a read-only file to a read-write
one, but that's probably not worth the effort in many real-world use cases.
James
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