Re: Poor network backup performance

I'm curious what would happen if you sent a full backup to suitably fast
disk based storage instead, what performance you'd see there. I know you
intend to back up to LTO, but I wonder what differences we'd see, if any.



Regards,
Robert Gerber
402-237-8692
[email protected]


On Thu, Nov 27, 2025 at 2:11 PM Phil Pemberton via Bacula-users <
[email protected]> wrote:

> I'll give that a shot, but both machines are running Linux.
>
> Thanks
> Phil.
>
>
> On 24/11/2025 16:50, Josh Fisher via Bacula-users wrote:
> > In both the FD and SD config files, set Maximum Network Buffer Size =
> > 32768. The default size of 64k is known to cause this issue in Windows,
> > or at least certain versions of Windows using certain NICs. You will
> > need to restart bacula-sd on the server and bacula-fd on the Windows PC
> > before testing.
> >
> >
> > On 11/21/25 09:55, Phil Pemberton via Bacula-users wrote:
> >> Hi all,
> >>
> >> I've been using Bacula to back up my NAS for some time, and it's been
> >> working well. I see effective backup rates of about 30MB/s all told
> >> (100MB+ unspooling from SSD to tape, maxing out the LTO6 drive).
> >>
> >> Unfortunately when I added my desktop PC to the backup cycle, I found
> >> that the effective rate dropped like a rock, to single-digit megabytes
> >> per seconds.
> >>
> >> The machines are both fairly fast -- the desktop machine (backup
> >> source running the FD) is a Ryzen 5 5600X, and the server (with the
> >> SAS SSD and tape drive) is an Intel Core i5-9400.
> >> The network is gigabit end-to-end, and the transfer rates I'm seeing
> >> are very poor. Other applications taking the same path are much faster.
> >>
> >> Both systems are running Debian derivatives -- the desktop runs Mint
> >> with Bacula 13.0.4, and the server runs Ubuntu 24.04 with the same
> >> version of Bacula.
> >>
> >> Is there anything I can do to improve performance backing up over the
> >> network, before I resort to a nightly Rsync from the workstation to
> >> the server and backing up from there?
> >>
> >> Thanks.
> >
> >
> >
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>
> --
> Phil.
> [email protected]
> https://www.philpem.me.uk/
>
>
>
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