NFS components supporting the staging workflow (dCache to/from HPSS) migrated from NFSv3 to NFSv4

•     Transition completed successfully on 01/14/26 between 10:00–11:00 AM.
•     Migration was transparent to users.

Reviewed Network/TCP kernel parameters for dCache dual-home pools and doors:

• Doors were using legacy settings; dual-home pools were not optimized for WAN access.
• Network/TCP kernel parameters were identified based on ESnet Fasterdata tuning guidelines.
• TCP tuning has been applied to dcdoorsX and dual-home pools since 01/12/26.
• Per-file transfer performance improvements observed during testing: 

TCP pull from CERN EOS to a BNL dual-home pool (16 GB file):

Baseline (as-is): 34.23 MiB/s 

After WAN tuning: 167.08 MiB/s

Performance improvement: ~5× throughput increase