Fermilab Mass Storage System (FMSS) can be accessed from D0 Challenges d0cha/d0chb. D0 fixed DST and other streamed data-sets are available on FMSS. Important user data files can be archived to and retrieved from this system.
The software utilities to access FMSS is a product called fmss. The old product d0hsm is no longer supported.
The current Mass Storage System being used at Fermilab is NSL Unitree Hierarchical Storage Management (HSM) System. It will be moved to High Performance Storage System (HPSS) sometime next year.
Here is a Users Guide on how to access Fermilab Mass Storage System.
The area that D0 group uses on FMSS is called mss:/e740, Use fmss to read/write data from/to this area, Here are a few examples:
% setup fmss
set up product fmss
% fmss ls mss:/e740/dzero/d0cha
list files in mss:/e740/dzero/d0cha area
% fmss cp disk:my_ntuple_1 mss:/e740/dzero/d0cha/user/my_ntuple_1
copy a local disk file in the current directory to FMSS
% fmss cp mss:/e740/dzero/d0cha/user/my_ntuple_1 disk:my_ntuple_1
retrieve an archived file from FMSS back to local disk
mss:/e740 is also NFS mounted on d0cha/d0chb as /ute740. Note that this NFS mount is read only which means you can not write any files to /ute740 area on Challenges. Also this area is not intended to be used as a working disk. Analyzing a file residing on this disk directly is highly discouraged because it affects negtively the FMSS performance. You should always copy the file from FMSS to your local disk using fmss cp command, and analyze the local disk file to save time.
If you want to know more about FMSS, please visit MSS Home Page .