Scientific analysis servers

This article describes the scientific analysis servers. It covers:

  • Scientific Analysis  servers 
  • When to use Scientific servers?
  • Software installed 
  • Access to storage 

Once you have logged on JASMIN login gateway servers you can then ssh to the shared analysis servers that you have been given access to. 

Scientific analysis servers 

Access to the scientific analysis servers (Sci-servers) is restricted to ssh login from hosts inside the RAL firewall, so access from outside needs to be achieved via one of the  JASMIN login gateway servers.

Server name  Virtual/Physical (OperatingSystem)  Processor model CPU Cores RAM (GB) /tmp (GB)
V (Centos7) Xeon(R) Silver 4114 CPU @ 2.20GHz  8    16     NA
V (Centos7) Xeon(R) E5-2630 @ 2.20GHz  8    16     NA V (RedHat6) Xeon X5675 @ 3.07GHz  8    32     NA V (RedHat6) Xeon E5-2660 @ 2.20GHz  8    32     NA P (RedHat6) Xeon E7-4860 v2 @ 2.60GHz 48 2117 20 V (RedHat6) Xeon E5-2660 @ 2.20GHz 8 32 NA V (RedHat6) Xeon E5-2660 @ 2.20GHz 8 32 NA P (RedHat6) Xeon Gold 5118 @ 2.30GHz
24 384 8 V (RedHat6) Xeon X5675 @ 3.07GHz  8 32     NA
P (RedHat6) Xeon E7-4860 v2 @ 2.60GHz 
48 2117 20

Note 1: jasmin-sci[3,6] and cems-sci2 are physical servers with IP addresses on a private internal network, so outbound internet access (via NAT) is only for http/s. This means that outbound SSH will not work (to hosts outside of JASMIN) on these particular machines.

Note 2: You should use the full hostname of one of the sci servers above when logging in. Previously there was a DNS alias for "jasmin-sci" (without a number) but this should NOT be used now.

So for example if you had a JASMIN user login you would type:

[username@jasmin-login1 ~]$ ssh

Note 3: The local /tmp of the virtual VMs is Not Available (NA) for users as this is used by the VM.

For more information on using the JASMIN Analysis Platform  click here.

When to use Sci-servers? 

Scientific analysis servers are designed for interactive and ad-hoc analysis of data in group workspaces, the CEDA archives, and users' home directories.   For long-running and resource-intensive jobs, users are required to use the LOTUS cluster which offers better I/O performance, parallelism, and scheduling.

The following guide should be considered when using the scientific analysis servers:

  • Be aware of resources available at the time before your process starts and choose the scientific server that is suitable ( check the average load on the scientific server from the message of the day on login server for example or using any of Linux monitoring command: top, free -h )
  • Execution/processing time should be less than 1 hour;
  • Serial jobs only 
  • High memory jobs should be executed on the high memory scientific servers with 2117 GB of RAM (see above Table column 1 )
  • Monitor your process on a scientific server using top or ps Linux command 
  • Report if there is a user's process affecting the performance of a scientific server 

Software installed

Each analysis server has the following features:

  • Default Redhat Enterprise Linux development environment.
  • The software packages that make up the JASMIN Analysis Platform are all installed - providing commonly-used open-source analysis tools.  These packages include NCO, CDO, Python2.7 (with netCDF4, matplotlib, numpy etc.,) and R.
  • Access to proprietary tools, e.g. IDL and Intel Fortran, through the Module System.
  • Ability to run X-Windows applications by tunneling your X session through ssh.

Access to storage 

Each analysis server has:

  • Access the LOTUS /work/scratch area.
  • Read access to the CEDA Archives according to user permissions.
  • Read/Write access to Group Workspaces according to user permissions.