Micah Beck wrote:
[...]
>
> 2. mirroring means source replication
>
> 3. caching means output replication
>
this is a little controversial when the protocol used to provide
the service on a replica is the same as the one used to perform
the actual copying.
Examples:
if the service is http, and it's being mirrored using wget,
we are copying the output of the origin server. does it mean
we are caching it ? no.
in classical ftp mirroring, both the service protocol
and mirroring protocol are ftp. in fact what we are doing,
is we are mirroring the output of the origin ftp server,
not its source, as there are many ftp daemons that
are configured to hide parts of the source tree
(or individual files) from anonymous users.
this again can hardly be called caching.
my argument here is that the distinction between
source replication and output replication as
a criteria to differentiate caching from mirroring is
a wrong one. we are always replicating the server's
output. unless we are copying raw filesystems,
or at least the complete tar files of the source.
--w
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