The NESDIS Product Distribution and Access (PDA) system will undergo planned failover that will affect the timeliness of some CoastWatch products.  Products from GOES, S-NPP, NOAA-20, and MetOp spacecraft will be affected (sea surface temperature, winds, sea level anomaly, ocean color: chlorophyll, Kd490).  

Topic: Planned PDA Partial Failover to CBU and Full Outage of PDA OPS at NSOF 

Date/Time Issued:  June 24, 2021 1756Z

Product(s) or Data Impacted:  All products distributed from PDA. Some products will be available at CBU and some will be unavailable for part of the time maintenance window.  

Date/Time of the Initial Impact: Jun 28, 2021 1400Z

Date/Time of Expected End:  Jun 30, 2021 1400Z

Length of the Outage: Failover to CBU ~48 hours; Full outage at NSOF OPS ~6-8 hours -- shutdown to start at 1100Z on Jun 29.  

Details/Specifics of Change:  

On Jun 29, a significant storage maintenance activity will take place during business hours that will require a period of about 6-8 hours of complete PDA downtime.  Delivery of GOES-16/17, Metop, POES and other data provided from PDA will cease distribution during that affected time.  When the PDA system is returned to service, it is  anticipated that users will be able to receive and distribute products that were ingested/created during the outage time.  However, there will be a significant backlog on PDA, and it may take several hours for the PDA OPS at NSOF to receive and distribute all the products produced during the outage period.  During the outage PDA period, latency will be impacted as the backlog of products are processed and distributed.

In order to minimize the outage impact, NESDIS  plans to partially activate the Consolidated Backup (CBU) site at Fairmont, WV where only distribution of data and products from S-NPP, NOAA-20 and GCOM-W1 are available.  This failover is expected to begin with the first orbit received after 1400Z on Jun 28 (the day before the outage in OPS) and end with the next orbit received after 1400Z on Jun 30 -- the day before and after the full PDA OPS outage. The exact times of the failover will be announced closer to the event.   It is noted that while in this data failover configuration, S-NPP, NOAA-20 and GCOM-W1 data and products will ONLY be at CBU for that period of about 48 hours and then will be returned to the nominal PDA OPS system at NSOF 

At this time duplicate data will not be distributed between PDA OPS and CBU; therefore, pull users will be safe to pull data from both sites starting at the time of partial failover and until about 1.5 hours after failback end time while the final NDE products are created at CBU.