What is the power draw? I use a 1500 VA apc backups with 6 outlets on ups and 5
on surge protection. As long as your total draw is less than 1200 VA, for <
$200 canadian you have a cheap simple solution. Just put on on the ups side and
the other on the surge suppressor side. Or buy 2.leonard@on the road
-------- Original message --------From: Don Tek <don...@gmail.com> Date:
2021-09-25 11:40 (GMT-05:00) To: jslee <indig...@oldcorollas.org> Cc:
misc@openbsd.org Subject: Re: CARP Cold Spare I'm not sure why the hardware
matters, but the two machines are a couple HP 1U Gen 8 Xeon servers. Suffice
to say, they are identical and have supported hardware configurations for
OpenBSD.Of course I _could_ run one off direct power, but it would be a
terrible idea. The location is notorious for power surges, blips that are
enough to reboot servers and several-second brown-outs. So, not connected to
the UPS is just asking for damages.They experience multi-hour blackouts what
seems like once a month; this is where the desire to limit the draw on the
UPS's comes from. To ensure we make it through without having to shut
down.Remote access is of primary concern, both for me for support, since I'm
geographically far enough away that being on-site is not feasible, and to the
customer, who just wants to stay home and work on systems in the
office.Configurations on the servers almost never change (simple firwall), so
besides having to run a quick syspatch and reboot once at time of failover, I
don't see maintenance being so bad. I keep config files backed-up otherwise
centrally for quick restore to the running box as well.My primary concern here
is if CARP / pfsync will have issues with the one machine being down a majority
of the time. Based on the FAQ, I think not, but have no practical experience.>
On Sep 25, 2021, at 3:00 AM, jslee <indig...@oldcorollas.org> wrote:> > Hi,> >
You haven’t said anything about your hardware platform, but could you run one
of them on non-UPS power? Then you’d still have one online when (*not* if) the
UPS fails, and also they’ll both normally be online for maintenance, syspatch,
config changes etc> > I do recall installing a pair of identical servers at the
same time and having them both fail a year later within an hour of each other,
both with seized CPU fans, so I am somewhat sympathetic to your idea. But I
think the practical cost of maintenance may be rather high> > John> > >> On
Sat, 25 Sep 2021, at 08:13, Don Tek wrote:>> Would there be any ‘problem’ with
configuring a 2-machine CARP setup >> and then just keeping one machine
powered-off until needed?>> >> I realize this defeats live failover, but this
is not a requirement for >> my customer.>> >> I just want them to be able to,
in the event of a primary machine >> failure, power-on the secondary and have
it take over. Logic here is >> to otherwise not have the secondary sucking
power off the UPS’s in the >> event of a power failure, or in general.>> >>
Legit?
