[Borgbackup] Slow backup speed

[Zack Coffey]

I think you are right, it's not a bandwidth issue. But NFS dealing with
that many small functions may be the bottleneck.

I've seen NFS be the bottleneck many times when dealing with large amounts
of small files or small changes. Big file transfers, it blazes. Tons of
tiny ones, grinds to a halt. Some NFS mount tweaks can help that though.

On Tue, Oct 30, 2018 at 2:55 AM Sebastian Pölsterl <sebp at k-d-w.org> wrote:

> Hi,
>
> I'm using borg via borgmatic to backup of about 10TB of data. Since
> incremental backups take about 13 hours, I was wondering if there's any
> configuration option that can be used to speed things up, or if 13 hours
> is an expected duration.
>
> In total, the volume contains about 25 million files, but changes are
> rare. Backups are created daily and are carried out over a gigabit
> network connection with the client's disk mounted via NFS on the server
> running borg. Backups are created with --files-cache ctime,size and lz4
> compression. Based on monitoring bandwidth usage, I would say that
> network bandwidth is not the bottleneck.
>
> Is there any configuration option I have been missing so far that could
> help to speed up daily backups?
>
> Thanks for your help!
>
> --
> Sebastian
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