[Op1st-dc-alerts] [mghpcc-alerts] **Potentially Service-Affecting** Electrical Work December 12-17, 2022

[mghpcc-alerts at mghpcc.org]

Notice of two upcoming events that have the potential to affect service.

1. Plan to power down the switchboards that feed power to the Following 
    Pods in the MGHPCC computer room at different times during the week 
    of December 12, 2022.
      R1-PA, 
      R1-PB (even side)
      R2-PA, R2-PB
      R3-PA (even side)
      R4-PA (even side)
      R5-PB 

2. Generator maintenance on December 15 and 16, 2022.

All work will take place between 7AM and 6PM.

Tenant Impact
--------------------
There may be brief periods of time when we will ask everyone to leave the 
Computer Room for safety (e.g. when a switchboard is being powered up).

Computing, Storage, and Networking equipment in the pods listed above 
that has been properly configured for operation with power cords attached 
to both the “A” and “B” PDUs in their racks should not be affected. 

Equipment in pods other than the ones listed above should not be affected, 
independent of configuration.

There is elevated risk for the entire Computer Room while the work is 
being done.

Description
—————
The switchboards that feed power to the pods listed above will be powered 
down to install new electrical circuits in the MGHPCC computer room.  The 
switchboards will be powered down one at a time, so there will always be at 
least one bus with active power in all three pods.  Each of the four switchboards 
involved in this work will be powered down for approximately two days.

MGHPCC will be performing routine preventive maintenance on the two generators 
in the transformer yard. This will involve disabling each generator while the maintenance
 work is being done.  In the unlikely event that a utility power outage occurs while one 
of the generators is unavailable, operation of both UPS-backed and non-UPS-backed 
equipment in the data center would be disrupted.