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The IHEP server (lxslc)

The IHEP server (lxslc)#

Within BESIII, most analysis tasks are run on a server that is hosted by IHEP. The server is also where you will use BOSS. You will need to apply for an IHEP computing account to be able to log in.

Accessing the server#

The IHEP server runs on Scientific Linux CERN (SLC). The server offers several versions. Usually, people use either SLC5, SLC6, or SLC7. The domain names for these are lxslc7.ihep.ac.cn, where the 7 in this case refers to SLC7. If you are running on Linux or a Linux terminal, the server can be easily accessed using:

ssh -Y <your user name>@lxslc7.ihep.ac.cn

Here, the option -Y ensures X11 forwarding, allowing you to open graphical applications from the server.

Note

If you don’t like having to enter your password every time you log in, have a look at the section Key generation for SSH.

In Windows, there are some nice tools that allow you to access the server. First of all, to be able to use SSH, use will either have to use PuTTY or more extensive software like Xmanager. You can also just search for some Linux terminals for Windows. In addition, have a look at the (S)FTP client WinSCP. It allows you to easily navigate the file structure of the IHEP server and to quickly transfer―even synchronize―files up and down to your own computer.

Note

Once in the server, you can switch to other versions of SLC using hep_container. So for instance, if you are in SLC7 (CentOS) and want to use SL6, you can use:

hep_container shell SL6

where shell can be replaced with your shell of choice.

Important data paths#

Some other important directories for the BESIII Collaboration are the following:

  • BOSS Software directory

    • /cvmfs/bes3.ihep.ac.cn/bes3sw/Boss (also referred to with $BesArea)

  • Raw data files

    • /bes3fs/offline/data/raw

    • /besfs5/offline/data/randomtrg (random trigger data)

  • Reconstructed data sets

    • /besfs3/offline/data/

    • /besfs/offline/data/ (older versions)

  • Reconstructed Monte Carlo sets (latest version available is 6.6.4):

    • /besfs2/offline/data/664-1/jpsi/09mc/dst (2009; 225M)

    • /besfs2/offline/data/664-1/jpsi/12mc/dst (2012; 200M)

    • /besfs2/offline/data/664-1/jpsi/12mc/grid/dst (2012; 800M)

    • (no reconstructed MC samples available yet for 2018)

These directories will be important later in this ‘tutorial’.

Note

For the latest data file locations, see this page.

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