Use Numbers

To argue, try to use statements with numbers, like

• "1000 sites * 20 services * 200 VOs * 10 roles/groups = 40M metadata"
• "100k CPUs * 10 jobs per day * 10 queries per job = 10M queries per day, 115 queries per second."
• Publishing one service adds 138 RDF statements to the triple store, which consumes up about 25 KB of memory. Then each triple uses 181 bytes. Each metadata has at least 3 triples: (entity, hasMetadata, metadata), (metadata, hasMetadataType, type), (metadata, hasMetadataValue, value). Thus 4M metadata uses 181 * 3 * 4M = 2.1GB.

And pay attention to detail.