HP Surestore Disk Array FC60 HP SureStore E Disk Array FC60 Service Manual (A5 - 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. 403 Glossary