It is possible for and end-user to reserve space using the srm-reserve-space command.

[user@ui-node] $ srm-reserve-space -2 \
> -desired_size 2000 -guaranteed_size 1024 \
> -retention_policy=REPLICA -access_latency=ONLINE \
> -lifetime 36000 \
> srm://dcache-node.fzk.de:8443
WARNING: SRM_PATH is defined, which might cause a wrong version of srm client to be executed
WARNING: SRM_PATH=/opt/d-cache/srm
Space token =30004

The correponding space token can be used to transfer files into this reservation.