Configure Node Controllers

To prevent potential problems, we recommend that you perform the steps listed in this topic on each NC.

On some Linux installations, a sufficiently large amount of local disk activity can slow down process scheduling. This can cause other operations (e.g., network communication and instance provisioning) appear to stall. Examples of disk-intensive operations include preparing disk images for launch and creating ephemeral storage.
  1. Log in to an NC server and open the /etc/eucalyptus/eucalyptus.conf file.
  2. Change the CONCURRENT_DISK_OPS parameter to the number of disk-intensive operations you want the NC to perform at once.
    1. Set CONCURRENT_DISK_OPS to 1 to serialize all disk-intensive operations. Or ...
    2. Set it to a higher number to increase the amount of disk-intensive operations the NC will perform in parallel.