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Summer 2013 and winter 2014, there were an inordinate number of power outages in Baker Lab, and other Chem buildings! |
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Date
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Outage duration
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Cause
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Official link
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ChemIT notes
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2/27/2014
Thursday
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2 minutes
Oliver's record: Power outage at 9:53p. Restored at 9:55p.
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?
Time-stamps, from the IT folks:
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See also
- UPS inventory and status, mostly within ChemIT's Baker 248 server room
- ChemIT's record of recent power outages
Question
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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".
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1/27/2014
Monday
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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.
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?
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http://www.it.cornell.edu/services/alert.cfm?id=3040
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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.)
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12/23/2013
Monday
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2 minutes
CU's report: 08:36 AM - 8:38 AM
(ChemIT staff not in yet.)
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Human error?
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http://www.it.cornell.edu/services/alert.cfm?id=2982
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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.)
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7/17/13
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Half a morning (~2 hours)
CU's report: 8:45 AM - 10:45 AM
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http://www.it.cornell.edu/services/alert.cfm?id=2711
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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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