HP 6100 HP 4x00/6x00/8x00 Enterprise Virtual Array User Guide (5697-0733, Marc - Page 168
Glossary, array controller
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Glossary This glossary defines terms used in this guide or related to this product and is not a comprehensive glossary of computer terms. A active member of a virtual disk family adapter AL_PA allocation policy ambient temperature ANSI arbitrated loop arbitrated loop physical address arbitrated loop topology array array controller asynchronous audible alarm An active member of a virtual disk family is a simulated disk drive created by the controllers as storage for one or more hosts. An active member of a virtual disk family is accessible by one or more hosts for normal storage. An active virtual disk member and its snapshot, if one exists, constitute a virtual disk family. An active member of a virtual disk family is the only necessary member of a virtual disk family. See also virtual disk,virtual disk family, and snapshot. See controller. Arbitrated Loop Physical Address. A 1-byte value the arbitrated loop topology uses to identify the loop ports. This value becomes the last byte of the address identifier for each public port on the loop. Storage system rules that govern how virtual disks are created. Allocate Completely and Allocate on Demand are the two rules used in creating virtual disks. • Allocate Completely-The space a virtual disk requires on the physical disks is reserved, even if the virtual disk is not currently using the space. • Allocate on Demand-The space a virtual disk requires on the physical disks is not reserved until needed. The air temperature in the area where a system is installed. Also called intake temperature or room temperature. American National Standards Institute. A non-governmental organization that develops standards (such as SCSI I/O interface standards and Fibre Channel interface standards) used voluntarily by many manufacturers within the United States. A Fibre Channel topology that links multiple ports (up to 126) together on a single shared simplex media. Transmissions can only occur between a single pair of nodes at any given time. Arbitration is the scheme that determines which node has control of the loop at any given moment See AL_PA. See arbitrated loop. All the physical disk drives in a storage system that are known to and under the control of a controller pair. See controller. Events scheduled as the result of a signal requesting the event or that which is without any specified time relation. The Environmental Monitoring Unit (EMU) alarm that sounds when there is a drive enclosure element condition report. The audible alarm can be muted or disabled. B backplane bad block bad block replacement bail lock An electronic printed circuit board that distributes data, control, power, and other signals to element connectors. A data block that contains a physical defect. A replacement routine that substitutes defect-free disk blocks for those found to have defects. This process takes place in the controller and is transparent to the host. Part of the power supply AC receptacle that engages the AC power cord connector to ensure that the cord cannot be accidentally disconnected. 168 Glossary