[DRBD-user] drbd syncing all resources hangs business app

[Ferran Alchimia]

Hi Roland,

Thank you for your answer and time. I've been looking for the
auto-resync-after-disable parameter without any luck. I'm using this
command to search for it `linstor controller drbd-options -h`.
So it seems that I'll have to build a resync chain since my
physical resources aren't able to handle the full sync without affecting
the business app.

Thanks and regards,
Ferran

Missatge de Roland Kammerer <roland.kammerer at linbit.com> del dia dv., 15 de
set. 2023 a les 10:35:

> On Fri, Sep 15, 2023 at 09:53:44AM +0200, Ferran Alchimia wrote:
> > We have 39 defined resoruces using the same settings. And all these
> > resources are running on the same RAID supported by two physical nvme ssd
> > drives.
> > We have two combined hosts and a diskless satellite host. The network
> card
> > between the two hosts is a 1Gb card.
> >
> > I have read the following guide
> > https://kb.linbit.com/tuning-drbds-resync-controller and I think our
> > current installation might have to be tuned in order to avoid those
> > application hungs.
>
> yes, obviously it is a good idea to check these settings, some defaults
> are a bit outdated for modern systems.
>
> In general there is also a "resync-after" setting where you can build a
> "resync chain" of resources, so that not all resources start syncing at
> the same time, but after each other in the defined order.
>
> Your setup looks like a Proxmox setup so you use LINSTOR, and it has a
> "DrbdOptions/auto-resync-after-disable" option. You might want to try if
> that helps and is good enough for you. disclaimer: I know it was enabled
> by default in a release and pulled back afterwards, but things might
> have improved enough, at least in such medium sized scenarios.
>
> Regards, rck
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