One is missing and this is why your array is showing as degraded. For RAID 6 you need two drives worth of space above and beyond the usable space, in your case a total of 6 drives. You are showing 5 drives for that array, at 1397GiB each, yet the array size is shown as 5584GiB.

You are missing a drive in your RAID 6 array. Here are some images of several commands I've ran: I would also then, need to figure out a way to find which physical disk belongs to each logical disk, so I can properly make a map of the server. Now, I'll be honest and admit that I'm very new to working with RAIDs and servers, I've done a lot of research and I'm assuming that one of the drives isn't working properly and needs to be replaced, but I can't seem to be able to pinpoint which one it is, I've ran several commands but I'm not really sure what sort of info I'm looking for, so I'd really appreciate any advice you guys can offer to a complete newbie. All drives are online and working, none is set as foreign and yet, the status of the virtual drive is set to partially degraded and sometimes as degraded. The issue I'm having is, whenever the server is restarted, the alarm starts beeping but there doesn't seem to be any obvious reason to this. I recently inherited a SuperMicro server running a hardware RAID 6 with a MegaRAID SAS 8708ELP on Linux and it's a big mess, according to my boss all the drives are scrambled and physical locations aren't the same as logical ones on the virtual drive.

Avago megaraid storage manager manual