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Summer 2013 and winter 2014, there were an inordinate number of power outages in Baker Lab, and other Chem buildings!

Date

Outage duration

Cause

Official link

ChemIT notes

2/27/2014
Thursday

2 minutes
Oliver's record: Power outage at 9:53p. Restored at 9:55p.

?

Time-stamps, from the IT folks:
http://www.it.cornell.edu/services/alert.cfm?id=3072
Not as helpful, from the power folks:

http://www.cornell.edu/cuinfo/specialconditions/#2050Image Removed

Michael led our effort to initially evaluate and restore systems, with Oliver adding to documentation and to-do's. Lulu completed the cluster restoration efforts.
Lost 1-2 hours each for Michael, Lulu, and Oliver.
Cornell called it a "power blip". In Oliver's books, any outage longer than seconds is not a "blip".

1/27/2014
Monday

17-19 minutes
CU's record: Power outage at 2:22p. Restored around 2:41p.
Oliver's record: Power outage at 2:22p. Restored at 2:39p.

?

http://www.it.cornell.edu/services/alert.cfm?id=3040

Lulu, Michael, and Oliver shut down headnodes and other systems which were on UPS. (Those systems non UPS shut down hard, per usual.)
Lost 3 hours, for Lulu, Michael, and Oliver.
Roger away on vacation (out of the U.S.)

12/23/2013
Monday

2 minutes
CU's report: 08:36 AM - 8:38 AM
(ChemIT staff not in yet.)

Human error?

http://www.it.cornell.edu/services/alert.cfm?id=2982

Terrible timing, right before the longest staff holiday of the year.
ChemIT staff not present during failure.
Lost most of the day, for Roger and Oliver.
Michael Hint and Lulu way on vacation (out of the U.S.)

7/17/13

Half a morning (~2 hours)
CU's report: 8:45 AM - 10:45 AM

 

http://www.it.cornell.edu/services/alert.cfm?id=2711

 

See also

Question

Question: When power is initially restored, do you trust it? Or might it simply kick back off in some circumstances?

  • Because we don't know the answer to this question following any specific power outage, we are reluctant to turn back on servers right away. Instead, we like to wait ~10-25 minutes.

 

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Also consider

  • When communicate with others, and what gets communicated, for what purpose?

Procedures and reminders

Reboot switches?

  • 8 switches support the clusters (out of 12 in the room).

Start

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head nodes, if not on already

  • Only a few are on UPS. Those can obviously be left on.
  • None should be set to auto-start on power-off.

Confirm

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head nodes accessible via SSH

PuTTY on Windows

Use FMPro to get connection info?! (not the right info there, though...)

Menu => List Machine / User Selections = > List Group or selected criteria

  • Machine function => Server HN

Start compute nodes

If nodes done show up, consider:

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