| Date | Number of Institutions | Number of hosts |
|---|---|---|
| October, 2001 | 131 | 244 |
| February, 2002 | 155 | 268 |
| May, 2002 | 165 | 292 |
The international reach of the IDD is growing as it is now serving sites in Australia and Brazil.
Since February, although the data volumes of most feeds have remained about the same, there have been significant increases on the following feeds:
| Feed Type | Feb MB/hour | May MB/hour | Comments |
|---|---|---|---|
| CONDUIT | 399.4 | 862.1 | Due to the addition of 20km RUC output, and the extension of the AVN forecast from 120 hours to 180 hours |
| HDS | 91.4 | 99.1 | Additional products |
| NEXRAD | 79.0 | 139.1 | Seasonal weather |
| FNEXRAD | 4.5 | 17.8 | Due to addition of 1 km mosaics generated every 10 minutes |
| GEM | 0.0 | .7 | New feed (see below) |
| Total - all feeds | 597.6 | 1142.5 | A cumulative increase of 91% |
To remedy this situation on Unidata's own server (thelma) it was necessary to rebuild the LDM with a 7 gigabyte queue. Building such a large queue requires that a host have large file support, that is, that it can support 64 bit addresses. Not all machines have this capability. Yet, it may soon be necessary to require at least top tier sites to have hardware that supports such large queues.
Using a large queue incurs a performance cost. In particular, upon establishment of a new connection, the time for a server to find its place in the queue is greater.
Unidata is now receiving the entire CRAFT feed on an experimental basis. Currently 38 radar sites are participating. Regarding data volumes, one small sample showed 163 megabytes/hour, about 10,400 products per hour.