RAID level of array = false?

I created a RAID 5 array and when I list out the attributes of the "hdisk" it reports back raid_level = 5 but the RAID level of the array = false. What does this actually indicate about my array? I've never paid much attention to this until now since I have a disk reporting failure I want to make sure I am (was?) working with a raid 5 array so I can rebuild the disk.

<host>:/# lsattr -El hdisk5
pvid none Physical volume identifier False
queue_depth 16 Queue DEPTH True
raid_level 5 RAID level of the array False
read_ahead no Read ahead enabled False
size 277720 Capacity of the array in MB False