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.
Log in to an NC server and open the
Change the CONCURRENT_DISK_OPS parameter to the number of
disk-intensive operations you want the NC to perform at once.
Set CONCURRENT_DISK_OPS to
1 to serialize all disk-intensive operations.
Set it to a higher number to increase the amount of disk-intensive
operations the NC will perform in parallel.