> I appreciate the reply - it keeps me from wondering "is there something I
> should be concerned about?". We use a co-location facility where we pay
> for bandwidth utilization so it's still an issue.
Hi,
You are right, bandwidth always costs, always.
Who pays for it can differ a lot, but there is always someone who pays.
It can be an individual, a company, the tax payer, whoever, but bandwidth
is never free.
Thanks,
Simon
>
> ________________________________
> From: CentOS <centos-bounces@xxxxxxxxxx> on behalf of Pete Biggs
> <pete@xxxxxxxxxxxx>
> Sent: Wednesday, March 25, 2020 1:32 PM
> To: centos@xxxxxxxxxx <centos@xxxxxxxxxx>
> Subject: [EXTERNAL] Re: Need help to fix bug in rsync
>
>
> Harriscomputer
>
> Leroy Tennison
> Network Information/Cyber Security Specialist
> E: leroy@xxxxxxxxxxxxxxxx
>
>
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> On Wed, 2020-03-25 at 19:15 +0100, Simon Matter via CentOS wrote:
>> > On Wed, 2020-03-25 at 14:39 +0000, Leroy Tennison wrote:
>> > > Since you state that using -z is almost always a bad idea, could you
>> > > provide the rationale for that? I must be missing something.
>> > >
>> > I think the "rationale" is that at some point the
>> > compression/decompression takes longer than the time reduction from
>> > sending a compressed file. It depends on the relative speeds of the
>> > machines and the network.
>> >
>> > You have most to gain from compressing large files, but if they are
>> > already compressed, then you have nothing to gain from just doing
>> small
>> > files.
>> >
>> > It obviously depends on your network speed and if you have a metered
>> > connection, but does anyone really have such an ancient network
>> > connection still these days - I mean if you have fast enough machines
>> > at both ends to do rapid compression/decompression, it seems unlikely
>> > that you will have a damp piece of string connecting them.
>>
>> I really don't understand the discussion here. What is wrong with using
>> -z
>> with rsync? We're using rsync with -z for backups and just don't want to
>> waste bandwidth for nothing. We have better use for our bandwidth and it
>> makes quite a difference when backing up terabytes of data.
>
> I don't really care if you use -z, but you asked for the rationale, and
> I gave you it. I'm not telling you what you should do.
>
> I'll try and make it simpler - if rsync takes 1 second to compress the
> file, then 1 second to decompress the file, and the whole transfer of
> the file takes 11 seconds uncompressed vs 10 seconds compressed, then
> dealing with file takes overall 12 seconds compressed, vs 11 seconds
> uncompressed. It's not worth it.
>
> But as I said it depends on your network and your machine speeds. It's
> up to you to decide what is best in your own situation.
>
> P.
>
>
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