Does setting the read ahead parameter using the blockdev command affects open files and running process?
Example: The default value for read ahead is 256.
Suppose I run the following:
sudo blockdev --setra 8 /dev/sdX
Will this instantly enter in effect and will affect all running processes which have files open in a partition mounted from /dev/sdxn?
If not, what is the minimal for this to enter in effect? Is restarting the processes so that they can open the files again enough or do I need to remount the partition?
