XCache

To speed up remote data access, Analysis Facility maintains an XCache server (managed through SLATE), with 25 x 1.5 TB NVMes and 2x25 Gbps NIC.

Users that want do access remote data of their own (on EOS or elsewhere) can manually add the prefix root://xcache.af.uchicago.edu:1094// to their root paths, eg:

If the original path is eg.:

root://someserver.org:1094//atlaslocalgroupdisk/rucio/user/mgeyik/63/c4/user.mgeyik.26617246._000006.out.root

make it:

root://xcache.af.uchicago.edu:1094//root://someserver.org:1094//atlaslocalgroupdisk/rucio/user/mgeyik/63/c4/user.mgeyik.26617246._000006.out.root

While initial data access will be slightly slower, following accesses will be lightning fast.

NB. ServiceX uses the XCache by default.