I discovered one of my servers running slower than usual today because of the checkarray launched by a cronjob installed by default on the server. This is Ubuntu 14.
In this particular case, I have just a single RAID1.
What is the purpose of this check? To flag a disk as faulty in case that checks turn out wrong and in the hope to minimize future problems while waiting to total failure?
How should I configure this checks to better fit my setup? If I should do that at all.
Is there a why to run this "nicer" that the idle mode? I am a bit concern about performance while system is on production due to intense I/O operations.