Re: Pgbackrest backup is too slow

Hello Stephen,
Thanks for your prompt response.
As recommended by you, I will try to isolate the problem at system level,
Meanwhile, Is there any system recommendation by pgbackrest, (how much
process-max should be configured) should I set affinity to pgbackrest
process, how many core should be kept for backup /restore. Or any other
configuration?

My DB size is 500GB and increasing .

Regards,
Ajay

On Fri, Oct 11, 2019 at 6:20 PM Stephen Frost <sfrost(at)snowman(dot)net> wrote:

> Greetings,
>
> * Ajay Pratap (ajaypratap(at)ameyo(dot)com) wrote:
> > I have a Centos 7 server which runs Postgresql 10.7. I am using
> pgbackrest
> > to take db backup.
> > Problem is backup is too slow.
>
> Have you tried running 'top' to see what's going on?
>
> > My data dir size is 9.6G and full backup runtime is 22 mins
> > I also tried using process-max=3, full backup runtime = 21 mins
>
> Erm, those numbers don't make any sense to me- as an example, we
> regularly back up a 12GB database, from Dallas to San Fran, in 5
> minutes.
>
> I see you're requesting a checkpoint to start immediately, but how long
> does the checkpoint actually take to complete? Have you looked at your
> PG logs..?
>
> Have you tried running 'top' and then running the backup and looked to
> see what's going on? Is the CPU at 100%? Are all the processes stuck
> in 'D' state all the time (meaning you don't have enough i/o resources),
> or...?
>
> > In production we have a database of size more than 500GB. It would not be
> > feasible for me to use it as it is.pgbackrest version is
> > 2.18-1.rhel7.x86_64.
> > installed from pgdg yum repo.
>
> Given sufficient resources, we've seen pgbackrest push over 1TB/hour, so
> there is definitely something strange going on here.
>
> Thanks,
>
> Stephen
>

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