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Update xcache.md
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ivukotic authored Feb 20, 2024
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# XCache

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

ServiceX uses the XCache by default.

Users that want do access remote data of their own (on EOS or elsewhere) can manually add the prefix `root://192.170.240.18:1094//` to their root paths, eg:
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://192.170.240.18:1094//root://someserver.org:1094//atlaslocalgroupdisk/rucio/user/mgeyik/63/c4/user.mgeyik.26617246._000006.out.root
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.

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