Author Topic: Website Maintenance  (Read 1407 times)

Offline whitejc

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Website Maintenance
« on: September 17, 2010, 02:11:53 PM »
I've received this info from the hosting company....

Data Centre Essential Power Systems Maintenance

Saturday 2nd October 2010 00:00 - 08:00

The data centre that houses the majority of our servers will be carrying out essential repairs to their main power systems on Saturday 2nd October 2010 between the hours of 00:00 and 08:00 (UK Time).

Unfortunately due to the nature of the repairs all power to our servers will be unavailable for at least four hours.

A full breakdown of the maintenance schedule is below:-

The data centre will be enacting procedures for a controlled power down and power restore. This will happen between the hours of 00:00 and 08:00 on Saturday 02/10/10.

These procedures are being put into action to allow essential repairs to the main power systems. For further details on these repairs please see ‘Technical explanation of cause’.

As part of procedures for restoration of power there will additional staff on site at the data centre. They will be checking that all services have power restored and pro-actively investigating any issues.

Sequence of events
00:00: We will start executing a soft shutdown on all servers  in the data centre.
01:00: Mains power will be systematically shut down.
05:00: The data centre aims to begin restoring power systematically across the site, in stages.
Technical staff will begin pro-actively investigating and restoring service to any problematic servers.
08:00: The data centre aims to have all servers back online.

Technical explanation of cause
The data centre recently installed a fourth 500kva UPS into the data centre to add resilience and capacity to their power systems.  The data centre was designed with this in mind, so the appropriate connections exist on the Schneider UPS Output Panel (that feeds all servers from a common busbar) to connect this UPS.

During the installation of the UPS, engineers discovered there was a fault with the panel which meant the additional UPS could not be connected.  To repair this fault, they need to electrically isolate the panel, as engineers cannot work on the panel while it is live for safety reasons.

The manufacturer of the panel, Schneider, is sending a team of engineers to repair the panel so it can accept the fourth 500kva UPS.

Please accept our apologies for this extended maintenance which is unfortunately out of our control.