HP Surestore Disk Array 12h - And FC60 Service Manual page 404

Uninterruptible Power Supply (UPS)
An Uninterruptible Power Supply is a power supply that is capable of maintaining
power even if the input ac mains supply loses its source of power.
VHDCI
Very high density cable interface.
volume set addressing (VSA)
An enhanced technique for addressing disk array LUNs. VSA overcomes the eight LUN
limit imposed by PDA, allowing all 32 LUNs on the disk array to be addressed by the
host.
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