how can i know a disk fail if it is a hardware raid?

if u want to check the status of hardware raid in linux than you use any kind of software for it well i am sure on it that when you buy the hardware raid it is ship with some drivers and software for it to checking the status so for checking about hardware raid you should go for some software who ll give you the stauts o hardwICP Vortex  
ICP Vortex provides the GDTMonitor management utility for its controllers. The utility provides the ability to monitor transfer rates, set hard drive and controller parameters, and hot-swap and reconstruct defect drivesare raid so try to find any software for status

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