HP Surestore Disk Array 12h - And FC60 Service Manual page 270

Glossary
Target
Terminator Block
Time Stamp
Unallocated Capacity
Uninterruptable Power Supply
VEB
270
A SCSI device (usually the peripheral) that responds to an operation
requested by a SCSI initiator (usually the host system). SCSI
peripherals are targets, but for some commands (for example, a COPY
command), the peripheral may need to act temporarily as an initiator.
An electrical connection at each end of the SCSI bus composed of a set
of resistors (or possibly other components). Its function is to provide a
pull-up for open-collector drivers on the bus, and also impedance
matching to prevent signal reflections at the ends of the cable. The
SCSI bus requires termination at both ends of the bus. One end of the
SCSI bus is terminated by the adapter's internal termination. The other
end should have a terminator placed on the 68-pin high density SCSI
connector on the last SCSI peripheral. If this device is not terminated,
data errors may occur.
All data blocks stored on the disk array are written along with a Time
Stamp. The Time Stamp allows the Disk Array Controller to determine
how frequently blocks of data have been accessed.
Array capacity that has not been assigned to a Logical Drive, and
therefore is not available to the server. The disk array uses all
Unallocated Capacity to improve array performance by using it for
RAID 0/1 storage.
An Uninterruptable Power Supply is a power supply that is capable of
maintaining power even if the input ac mains supply loses its source of
power.
VEB (Very Early Busy) is a SCSI parameter. VEB instructs the disk
array to return a BUSY response during its power-on sequence.
Following a power-on, it can take the disk array up to three minutes to
complete its internal self-test sequence. During this time, the disk array
will not respond to host commands if VEB is disabled. This may cause
some host systems to time out while waiting for the disk array to
respond. If VEB is enabled, the disk array will return a BUSY status to
the host rather than simply ignore any commands during this interval.
This will alert the host system to the presence of the disk array and thus
avoid the possibility of the host system "timing out" before the disk
array is ready.