[OSM-dev] [OSM-talk] Tile and dev down
Raphael Jacquot
sxpert at esitcom.org
Mon Sep 25 09:00:36 BST 2006
Nick Hill wrote:
> Hello Etienne
>
> If there is a local power failure, given the upstream network
> infrastructure will not be on UPS, we will inevitably experience some
> service outage. If we can ensure the servers come back up in the event
> of power interruption, all should be well.
>
> There are some other aspects of UPS which come into the equation;
> potential data loss, potential UPS failures and increased energy demand
> through UPS systems.
>
> Data loss is the biggest concern. UPS can help, but this is really best
> addressed through backup strategy, as there are so many potential points
> of failure which could lead to data loss, not related to power source
> failure.
properly set up UPS will allow for orderly shutdown of the boxes, thus
preventing potential database corruption.
good UPSs have a network connection and can be handled by munin (snmp),
we have that type at work
> Potential UPS failure; If the UPS failed, all systems will be offline
> until someone can bypass the UPS. UPSs also need periodic maintenance
> and replacement of lead-acid accumulators. This brings in disposal
> issues and environmental issues.
a good UPS will have it's default failure mode to bridge the power to
the box, removing itself from the equation, and sending a message (snmp
trap) or failing to send a message (watchdog timer) to the munin
management console (which can also send warning mails), thus telling the
interested people to look into the failure
> Increased energy demand. UPS systems loose some supply energy.
> Currently, this financial cost would be externalised from the OSM
> project as we don't (currently) pay for the direct electricity and
> electricity used for air conditioning cooling. However, OSM servers are
> built with environmental consideration and use recycled materials where
> appropriate. OSM can therefore claim to be an environmentally conscious
> project. I personally try to live with a small ecological footprint, so
> I prefer options which don't involve energy and material consumption.
ah well...
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