NCAS Computational Modelling Services

Unified Model

Migration of UM Data to JASMIN Elastic Tape

Instructions on how to add the JDMA app to a UM Suite to enable migration of model data to JASMIN Elastic Tape as part of the UM Workflow.

Setup and initialise JDMA on JASMIN

Before you can use the JDMA to migrate data to Elastic Tape you must install the jdma client on JASMIN and initialise some user settings.

  1. Install JDMA client software:
    • Login to a JASMIN sci machine
    • Load python2:
      module load jaspy/2.7
    • Create a virtual environment in your home directory:
      virtualenv ~/jdma_venv_py2
    • Activate the virtual environment:
      source ~/jdma_venv_py2/bin/activate
    • Install the jdma client into the virtualenv:
      pip install git+
  2. Follow instructions in the Setting up the user, user settings and user info section of the JDMA Tutorial.

UM Rose suite changes

Upgrade to postproc_2.4

  1. Upgrade fcm_make_pp app:
    • cd app/fcm_make_pp
    • rose app-upgrade -a postproc_2.4
  2. Upgrade postproc app:
    • cd app/postproc
    • rose app-upgrade -M /home/ros/um/um_work/postproc_2.4_archer2_jasmin_rewrite/rose-meta -a pp24_t588
  3. Edit app/postproc/rose-app.conf:
    • Set meta=/home/ros/um/um_work/postproc_2.4_archer2_jasmin_rewrite/rose-meta/archive_and_meaning/postproc/pp24_t588

Edit Suite Metadata

  1. Copy extra metadata to add JDMA switch:
    • cp -r ~um/metadata/ncas_extras <suite>/meta
  2. Edit the file <suite>/meta/rose-meta.conf to add to the top:
    • import=meta/ncas_extras

Rose Edit

  1. In panel suite conf -> JASMIN Elastic Tape:
    • Set Migrate data to JASMIN Elastic Tape to True
  2. In panel fcm_make_pp -> configuration set:
    • config_base: fcm:moci.xm-br/dev/rosalynhatcher/postproc_2.4_archer2_jasmin_rewrite
    • config_rev:
    • pp_rev: postproc_2.4
    • pp_sources: branches/dev/rosalynhatcher/postproc_2.4_archer2_jasmin_rewrite@4462
  3. In panel postproc -> Post Processing - common settings -> ARCHER2-JASMIN Archiving -> Elastic Tape:
    • Set default_workspace to False
    • Enter the JASMIN GWS under which you wish to migrate the data to ET (e.g. ncas_climate).

Add Tasks to suite.rc File

As suites vary in their structure it is impossible to provide instructions that will cover all eventualities. The following points are provided for guidance only. We need to add the jdma task to the suite graph so that it runs after the pptransfer task has run.

  1. Locate pptransfer in the cylc graph. For UKESM and GA suites this is something like:.
     graph =
     {% if PPTRANSFER %}
    pptransfer {{'=> \\' if HOUSEKEEP else '' }}
     {% endif %}

Change this to be:

     graph =
    {% if PPTRANSFER %}
pptransfer {{'=> \\' if JDMA or HOUSEKEEP else '' }}
    {% endif %}
    {% if JDMA %}
jdma {{'=> \\' if HOUSEKEEP else '' }}
    {% endif %}
  1. Add jdma task definition to end of file before any {% include … %} :
    {% if JDMA %}
         pre-script = "PS1=${PS1:-}; source ~/jdma_venv_py2/bin/activate"
             batch system = background
             execution time limit = PT1H
             host =
             PLATFORM = Linux
             UMDIR = ~um
         inherit = JDMA_RESOURCE, POSTPROC
             CYCLEPERIOD = {{FMT}}
             ROSE_TASK_APP = postproc
    {% endif %}

Setup connection to JASMIN sci nodes

  1. Add the following to your ~/.ssh/config file on PUMA:
Host login1
User <jasmin_username> 
IdentityFile ~/.ssh/<jasmin-ssh-key>
ForwardAgent yes
ControlMaster auto
ControlPath /tmp/ssh-socket-%r@%h-%p
ControlPersist yes

Host sci? cylc1

Host sci* cylc*
User <jasmin_username>
IdentityFile ~/.ssh/<jasmin-ssh-key>
ForwardAgent yes
ProxyCommand ssh -Y login1 -W %h:%p
ControlMaster auto
ControlPath /tmp/ssh-socket-%r@%h-%p
ControlPersist yes
  1. Add your JASMIN ssh-key to your ssh-agent:
    • ssh-add ~/.ssh/<jasmin-ssh-key>
  2. Test connection to JASMIN:
    • ssh
    • You should be logged into the JASMIN sci node without prompt for your JASMIN passphrase.
  3. Add path to Rose/Cylc to your ~/.bash_profile on JASMIN:
    if [[ $(hostname) = sci* || $(hostname) = cylc* ]]; then
      # Rose/cylc on jasmin-sci & Lotus nodes
      export PATH=/apps/jasmin/metomi/bin:$PATH

Configure PPTransfer

If you haven’t already done so follow the instructions for configuring PPTransfer and setting up Gridftp certificate: Configuring PPTransfer

You may wish to consider using the JASMIN transfer cache disk as the JASMIN transfer destination. This is a large temporary storage area separate to the Group Workspaces. See JASMIN Transfer Cache for more information.