[olug] Fails Over, but does Not Fail Back

Rob Townley rob.townley at gmail.com
Tue Apr 27 20:14:52 CDT 2021

On Tue, Apr 27, 2021 at 10:17 AM Ben Hollingsworth <obiwan at jedi.com> wrote:

> It's been a long time since I dealt with linux failover, but back then,
> system2 would not revert back to system1 unless system2 went down.  A
> dual redundant system doesn't generally care which half is running as
> long as ONE of them is running.  There's no concept of a preferred and
> backup system--there are just two systems that are equally capable of
> handling the load.

I wish all redundant systems could be equal but they are not as in choosing
internet pathways.  When two systems are equal such as LAN bandwidth, I
wish active/active was the default more frequently because I would not have
a fallback problem and maximize speed.    For instance, we will be dealing
with multipath storage and LACP again soon enough.  But they often want
active/passive instead of active/active.  Active/Passive could also have
fallback problem whereas Active/Active does not.

> On 4/27/21 3:45 AM, Rob Townley wrote:
> > tldr; Systems that reliably fail over to redundant system, but absolutely
> > refuses to revert back to primary system.
> >
> > Looking for general guidelines on systems (primarily networking) to
> > troubleshoot the fail back to primary pathway.
> >
> > The failover happens reliably.   The   problem is  when the primary comes
> > back up, actually reverting back, aka “Failing Back” to the primary path.
> >
> > Have experienced this failure to fail back too many times across a
> variety
> > of equipment and systems.  Looking for general guidelines.  What do noobs
> > usually miss?
> >
> > Also, is it a common problem or just me?
> --
> *Ben "Obi-Wan" Hollingsworth* obiwan at jedi.com <mailto:obiwan at jedi.com>
> www.Jedi.com <http://www.jedi.com>
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> promise that You will pull me through. /-- Rich Mullins/
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