HP Surestore Disk Array 12h - And FC60 Service Manual page 403

stripe boundary crossing
In disk striping, if the stripe segment size is too small for a single I/O operation, the
operation requires access to two stripes. Called a stripe boundary crossing, this event
reduces I/O performance.
stripe segment size
The amount of information simultaneously read from or written to each disk in a LUN
using disk striping. The default stripe segment size is set to the same value used for
cache page size (4K or 16K). The stripe segment size is configurable and can affect I/O
performance. If the segment size for the LUN is set too small, it may result in many
stripe boundary crossings.
striping (disk striping)
See disk striping.
terminator block
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.
topology
The physical layout of devices on a network. The three Fibre Channel topologies are
fabric, arbitrated loop, and point-to-point. The disk array's default topology is arbitrated
loop.
unbind
Unbinding reverses the LUN binding process, deleting the LUN and returning the disk
in the LUN to the unassigned disk group. Unbinding destroys all data on the LUN.
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