19991214: Data Interruptions-ADMIN NOTICE NOUS72 KNCF (fwd)


726 
NOUS72 KNCF 141950
ADMNCF
SUBJECT: DATA INTERRUPTIONS DURING AWIPS NCF UPGRADE
ON WEDNESDAY AND THURSDAY, 15-16 DECEMBER, THE AWIPS NCF 
WILL BE UNDERGOING SOFTWARE UPGRADES THAT WILL AT TIMES 
AFFECT AWIPS SATELLITE BROADCAST NETWORK (SBN) 
TRANSMISSIONS AND AWIPS WAN TRAFFIC.  THE GENERAL SCHEDULE 
IS AS FOLLOWS:
.
WED 15 DEC:  SBN UPLINK PACKAGE WILL BE UPGRADED.  THIS 
WILL REQUIRE TWO, SIMULTANEOUS INTERRUPTIONS OF ALL FOUR 
SBN CHANNELS.  THE FIRST INTERRUPTION WILL OCCUR WHILE 
PLACING THE UPLINK PACKAGE ON A STAGING DATA SERVER AND THE 
SECOND WILL OCCUR WHEN MOVING THE UPLINK PACKAGE BACK TO 
THE PRIMARY AND SECONDARY SERVERS.  EACH INTERRUPTION WILL 
BE OF LESS THAN 30 MINUTES DURATION, AND WILL OCCUR 1 TO 2 
HOURS APART.  SATELLITE IMAGERY FOR THE DOWN PERIODS WILL 
NOT BE AVAILABLE, HOWEVER, ALL DATA ON THE NWSTG CHANNEL 
WILL BE QUEUED FOR TRANSMISSION WHEN SERVICE IS RESTORED.  
NO NWSTG DATA SHOULD BE LOST.
.
THU 16 DEC: MESSAGE HANDLING SYSTEM (MHS) WILL BE UPGRADED.  
THE MHS UPGRADE WILL REQUIRE TWO INTERRUPTIONS OF MESSAGE 
TRAFFIC ON THE AWIPS WAN.  THESE INTERRUPTIONS WILL OCCUR 
AS THE MHS IS MOVED TO AND FROM THE STAGING SERVER.  EACH 
INTERRUPTION WILL BE APPROXIMATELY 5 MINUTES IN DURATION 
AND WILL OCCUR 4 HOURS APART.  THE AWIPS OPERATIONAL MODE 
(AOM) SITES HAVE BEEN CONFIGURED SUCH THAT THEIR OUTGOING 
WAN DATA WILL BE QUEUED AT THE SITES UNTIL MHS IS RESTARTED 
AT THE NCF.
.
THE NCEP SDM AND NWS/OSO WILL PROVIDE FINAL AUTHORIZATION 
TO PROCEED WITH THE NCF UPGRADE, PROVIDING THAT NO 
SIGNIFICANT WEATHER IS PROJECTED DURING THE PLANNED WORK 
PERIODS.
.
ADDITIONAL MESSAGES WILL BE SENT TO AWIPS FIELD SITES JUST 
PRIOR TO THE START OF EACH DAY'S ACTIVITY, AND AGAIN UPON 
COMPLETION OF EACH DAY'S ACTIVITY.


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