How to know hardware RAID failure

[Mihamina Rakotomandimby <mihamina@xxxxxxxxx>]

Hi,

We have on an old Dell 2850 with 4 SCSI drives, where we put a Hardware 
RAID5 on 3 disks and left 1 as spare.
I dont remember exactly, but the RAID was setup in the BIOS, and when 
installing CentOS6, I just saw "1 drive".

If it was software RAID, disk failure could be seen in /proc/mdastat, 
and I could simulate failure with mdadm.

As far as it is hardware ATM, how, at least, to know the state of the 
RAID array? (syncing, healthy,...)

Thank you.

-- 
RMA.

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