HP A3550A - High Availability Disk Arrays Model 20 Storage Enclosure User Manual page 216

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Column heading Description
Lun LUN to which current disks are bound, displays "-" if no LUN
C/D Current / Default ownership of the LUN, displays "-" if none
Fru/BS Disk FRU/FRU-bind-slot (if they exist)
Cch LUN read (R = on, "-" = off) / write (W = on, "-" = off) cache
ATr LUN auto-trespass state (on, off, "-" = hot spare)
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