© Crown copyright Met Office 21st North America-Europe Data Exchange Meeting Sept. 2008 Dave...

© Crown copyright Met Office

21st North America-Europe Data Exchange Meeting Sept. 2008

Dave Hennings, Met Office, UK


Main Communications Links from Exeter,… and changes

BTF/R

BTMegastream

INTERNET

RMDCN(Orange BS

MPLS)

Netink

Frost

DART

10Mbs-1

2048Kbs-1

30Mbs-1 BT

VerizonF/R

256bs-1

64Kbs-1 NOAA-TOC

NOAA-NESDIS

CMC, Dorval

ECMWF, Rdg

ECMWF, Rdg

Meteo-France

DWD

DWD

Denmark

InternetDMZ

PartnerDMZ

NOAA-NESDIS

CMC, Dorval

UKMO - ExeterCentral Data Network

Ireland

ABoM- Mebourne64Kbs-1

16Mbs-1 (Backup)


GTS Link with NOAA-TOC Washington

BT Frame Relay link – (NOT RMDCN)

•64 Kbs-1 Committed Information Rate

•Three logical data channels (Alpha-Numeric, GRIB (& T4))

•TCP Sockets protocol

Problems:

ISDN backup still not functional (consider use of Internet backup route?)

UK to TOC mostly saturated

Actions:

COSMIC data moved to File transfer on NESDIS link

GTS traffic (MBytes per day)

0

50

100

150

200

250

300

350

400

450

Alpha-numeric rx'd Alpha-numeric tx'd GRIB/T4 rx'd GRIB/T4 tx'd

2005

2006

2007

2008


GTS Link with NOAA-TOC Washington

Inbound flow may be inhibited due to the saturated Outbound flow being unable to return IP sockets ‘ack’ packets quickly enough.


FTP File Switches - (DART file dissemination systems)

• RedHat Linux-based systems in core network & three DMZ’s

• Separate customer interfaces for systems on Internet and WAN DMZ,

• no direct customer access to core network

• incoming data pulled from DMZ)

• Replicated nodes in two resilient computer halls

• Automatic application failover between nodes with no data or service loss

• Single service address for each node pair

• Virus-scanned, hardened systems, centrally system-monitored

• Commodity servers and mirrored local storage, fibre interconnected.

• Use of DWD’s ‘AFD’ dissemination engine and monitoring tools.

• Support for multiple protocols (FTP, Secure, HTTP, SMTP etc)


Present Data types on NESDIS Link

Data Type Platform File header MB /day Files

AMSU-A Level 1B NOAA-ATOVS nss.amax 138 73

AMSU-B Level 1B NOAA-ATOVS nss.ambx 299 43

HIRS Level 1B NOAA-ATOVS nss.hirx 311 73

MHS Microwave Humidity Sounder NOAA-ATOVS nss.mhsx 197 29

HIRS Level 1B (AVHRR mapped to HIRS grid) NOAA-ATOVS npr.atav 97 43

NCEP SST derived from AVHRR (100Km) NOAA-ATOVS prd.sst.field 3 1

QuikScat Seawinds scatterometer data NASA/JPL npr.qbuf 220 28

AIRS Brightness temperatures NASA –EOS-2 (Aqua) npr.aibt 154 219

AMSU-A Brightness temperatures NASA –EOS-2 (Aqua) npr.aubt 9 209

SSM/I Brightness temperatures DSMP npr.sdrr 144 219

SSMIS Level 1c DSMPnpr.td{E,I,L,U}b

674 118

Ozone, retrieved profiles and/or total column from SBUV

DSMPprd.ozone.pmf

7 60

WindSat NPR_E068.WS

102 14

COSMIC bfrPrf_C004 15 1360

Total (wef 11 Sep 2008) 2370 2489


Present Data Volumes NESDIS Link

Data Volum e changes 2004-08

0

100

200

300

400

500

600

700

800

MB/day

2004

2005

2006

2007

2008


Dart FTP data: NOAA - (NESDIS) Suitland

Availability of link 7/2006- 9/2008

(Internet backup used during NESDIS move until link resumed)

Typical daily usage pattern – some bandwidth available


File transfer links with NESDIS

Issues :

(Outage for period of six weeks due to fault condition)

• Automatic usage of backup pathway via the Internet during link outage (Jan to mid Feb 2008)

• Trials of Critical Infrastructure Protection (CIP) site successful.

• Priority data feeds successfully tested from alternate site using Internet access (SSMIS and ATAV not tested).


Questions and answers

© Crown copyright Met Office 21st North America-Europe Data Exchange Meeting Sept. 2008 Dave...

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