FreeBSD also provides .iso.xz. Some examples here:
http://ftp-archive.freebsd.org/pub/FreeBSD/releases/amd64/amd64/ISO-IMAGES/13.0/

On Thu, Feb 18, 2021 at 4:23 PM Julien Lepiller <jul...@lepiller.eu> wrote:

> Sorry, a compressed .iso is probably common, a .iso.xz is very uncommon
> :). We even have had some reports of people trying to copy that directly to
> an installation media.
>
> Le 18 février 2021 14:56:44 GMT-05:00, Tobias Geerinckx-Rice <m...@tobias.gr>
> a écrit :
>>
>> Julien Lepiller 写道:
>>
>>> Usually compression is provided by the webserver, but maybe ours
>>> is not configured to do that.  I think we're the only distro to
>>> provide compressed isos.
>>>
>>
>> Really?  Most distribution ISOs use squashfs or similar with
>> XZ/LZMA compression.  It doesn't make sense to compress that over
>> the wire.
>>
>> That said: XZ compression currently saves 27% (559M -> 405M).
>> Transparently serving pre-compressed ISOs with nginx (gzip level
>> 9) would save about 25% (559M -> 415M), which is surprisingly
>> similar.
>>
>> Kind regards,
>>
>> T G-R
>>
>>

-- 
 - EJR

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