[DRBD-user] Backup frequency

[Ferran Alchimia]

Hi all,

I wanted to share my current solution with you. I've created an inotify
cron (https://man7.org/linux/man-pages/man7/inotify.7.html) that rsyncs the
database everytime there's a change on the /var/lib/linstor directory,
which isn't that common, since our shop is rather small.

I'll open a new post asking some HA questions about the linstor-controller.

Thank you all for your help.

Ferran


Missatge de Robert Altnoeder <robert.altnoeder at linbit.com> del dia dj., 4
de febr. 2021 a les 18:44:

> Your guess is correct, the controller is transaction-safe, so if it
> confirms the creation of a resource, it will also have updated the
> database. If the controller or the database cannot make the change, the
> entire transaction rolls back.
> The situation may be more complicated if etcd is used instead of a
> database, because as far as I recall, etcd is only “eventually consistent”,
> so some nodes may still be behind - but I don’t know the details of that,
> so don’t take my word on it. With the SQL databases, everything works as
> you would expect it to work for a committed SQL transaction.
>
> Best regards,
> Robert
>
> > On 04 Feb 2021, at 17:53, Yanni M. <gianni.milo22 at gmail.com> wrote:
> >
> > I don't know the internals of the Linstor database system but I'd guess
> that it updates itself each time you do a modification onto it like for
> example adding or removing resources, resource groups etc.
> […]
>
> > On Thu, 4 Feb 2021 at 05:47, Ferran Alchimia <ferran.alchimia at gmail.com>
> wrote:
>
> […]
>
> > The user guide talks about "regular backups" but it does not specify
> when does the controller database updates itself.
>
> […]
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