We're going to proceed with a software upgrade on every top of rack devices impacted by a software bug, located in SGP.
The maximum expected impact is a 10 min traffic disruption.
Maintenance window starts at 15:30 UTC and ends at 17:00 UTC, on the 6th of September.
Here is the list of the involved racks :

050918, 050919, 050920, 050921, 051020, 051021, 051022

Update(s):

Date: 2018-09-06 17:10:55 UTC
Done:
sgp1-sdtor23a-n3
sgp1-sdtor23b-n3
sgp1-sdtor25a-n3
sgp1-sdtor25b-n3
sgp1-sdtor26a-n3
sgp1-sdtor26b-n3
sgp1-sdtor27a-n3
sgp1-sdtor27b-n3

Associated racks :
051020
051022
051021


Date: 2018-09-06 16:57:26 UTC
Done :
sgp1-sdtor20a-n3
sgp1-sdtor20b-n3
sgp1-sdtor21a-n3
sgp1-sdtor21b-n3
sgp1-sdtor22a-n3
sgp1-sdtor22b-n3

Associated racks :
050919, 050920, 051020, 051021

Date: 2018-09-06 16:16:19 UTC
DONE :
sgp1-sdtor3a-n3
sgp1-sdtor3b-n3
sgp1-sdtor4a-n3
sgp1-sdtor5a-n3
sgp1-sdtor5b-n3

DONE with error:
sgp1-sdtor4b-n3 (20 minutes~ impact)

Associated racks :
050921
050918

Date: 2018-09-06 16:09:01 UTC
Done :
sgp1-sdtor17a-n3
sgp1-sdtor17b-n3
sgp1-sdtor19a-n3
sgp1-sdtor19b-n3
sgp1-sdtor1a-n3
sgp1-sdtor1b-n3

Associated racks :
050920, 050918