Re: Copying between lzo compressed BtrFS's: de/re-compressing.

[Diagon <kernel.boxy@xoxy.net>]

On 01/15/2016 04:25 AM, Filipe Manana wrote:
> On Fri, Jan 15, 2016 at 9:56 AM, Timofey Titovets <nefelim4ag@gmail.com> wrote:

>> 2016-01-15 12:00 GMT+03:00 Diagon <kernel.boxy@xoxy.net>:

>>> I'm copying a large number of files between two lzo compressed BtrFS
>>> filesystems on different drives mounted on the same machine. It appears
>>> that the files are being de/re-compressed. Is there a way avoid this?
>>
>> If you just copy files, files will be decompressed while reading and
>> recompressed while writing
>> For avoiding this, you must use send receive feature
> 
> No, send/receive does not avoid decompression on the send side nor
> re-compression at the receiving side. The receiving side writes the
> data from a send stream, which is uncompressed, to the destination
> filesystem using standard system calls like write/pwrite.

So, just to spell it out, I understand that de/re-compression is
unavoidable?  (And I'll post that to my stackexchange question.)

>> Have a nice day,
>> Timofey.

Thanks
/D.