Activating the LDM Installation

1. Become the LDM user in their home directory.
2. If an LDM is running, then stop it:

   ldmadmin stop
   

3. If the runtime symbolic link exists, then remove it:

   rm runtime

4. Create the runtime symbolic link to the just-installed LDM:

   ln -s ldm-6.13.13 runtime

5. Ensure that a valid product-queue exists by doing one of the following:
   1. If the product-queue doesn't exist and the command

      df -k var

      indicates that sufficient space exists for it, then create the product-queue with the following command:

      ldmadmin mkqueue -f

      where the -f option requests "fast" creation.

      If you don't have sufficient space for the product-queue, then you'll have to free-up some space or configure a smaller queue.

   2. If the product-queue exists, then execute the command

      pqcheck -v

      and do one of the following:
      1. If the product-queue is invalid, then recreate it with the following commands:

         ldmadmin delqueue
         ldmadmin mkqueue -f

      2. If the product-queue doesn't have a writer-counter, then create the counter and set it to zero with the following command:

         pqcheck -F

6. Start the LDM:

   ldmadmin start

7. Verify that the LDM is working:

   ldmadmin watch

   How quickly this verifies your LDM depends on the rate at which data-products are inserted into the product-queue.

If the LDM system is already running, then you can minimize the time that the LDM is off-line by combining some of the above steps. For example

cd $HOME && ldmadmin stop && rm -f runtime && \
ln -s ldm-6.13.13 runtime && ldmadmin start && ldmadmin watch

If you encounter a problem, check the LDM logfile for relevant messages.