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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