HP 6400/8400 HP StorageWorks 6400/8400 Enterprise Virtual Array User Guide - Page 134

controller event controller pair corrective action code CRITICAL Condition CRU customer replaceable unit A significant occurrence involving any storage system hardware or software component reported by the controller to HP P6000 Command View. Two connected controller modules that control a disk array. See CAC. A drive enclosure EMU condition that occurs when one or more drive enclosure elements have failed or are operating outside of their specifications. The failure of the element makes continued normal operation of at least some elements in the enclosure impossible. Some enclosure elements may be able to continue normal operations. Only an UNRECOVERABLE condition has precedence. This condition has precedence over NONCRITICAL errors and INFORMATION condition. Customer replaceable unit. A storage system element that a user can replace without using special tools or techniques, or special training. See CRU. D data entry mode default disk group Detailed Fault View device channel device ports device-side ports DIMM dirty data disk drive disk drive blank disk drive enclosure disk failure protection disk group disk migration state disk replacement delay DR group failover The state in which controller information can be displayed or controller configuration data can be entered. On the Enterprise Storage System, the controller mode is active when the LCD on the HSV Controller OCP is Flashing. The disk group that is created when the array is initialized. The minimum number of disks the group can contain is eight. The maximum is the number of installed disks. An HSV Controller OCP display that permits a user to view detailed information about a controller fault. A channel used to connect storage devices to a host I/O bus adapter or intelligent controller. The controller pair device ports connected to the storage system's physical disk drive array through the Fibre Channel drive enclosure. Also called a device-side port. See device ports. Dual inline memory module. A small circuit board holding memory chips. The write-back cached data that has not been written to storage media even though the host operation processing the data has completed. A carrier-mounted storage device supporting random access to fixed size blocks of data. A carrier that replaces a disk drive to control airflow within a drive enclosure whenever there is less than a full complement of storage devices. A unit that holds storage system devices such as disk drives, power supplies, fans, I/O modules, and transceivers. A method by which a controller pair reserves drive capacity to take over the functionality of a failed or failing physical disk. For each disk group, the controllers reserve space in the physical disk pool equivalent to the selected number of physical disk drives. A named group of disks selected from all the available disks in a disk array. One or more virtual disks can be created from a disk group. Also refers to the physical disk locations associated with a parity group. A physical disk drive operating state. A physical disk drive can be in a stable or migration state: • Stable-The state in which the physical disk drive has no failure nor is a failure predicted. • Migration-The state in which the disk drive is failing, or failure is predicted to be imminent. Data is then moved off the disk onto other disk drives in the same disk group. The time that elapses between a drive failure and when the controller starts searching for spare disk space. Drive replacement seldom starts immediately in case the "failure" was a glitch or temporary condition. An operation that reverses data replication direction so that the destination becomes the source and the source becomes the destination. Failovers can be planned or unplanned and can occur between DR groups or managed sets (which are sets of DR groups). 134 Glossary