HP 12000 HP StorageWorks 12000 Gateway Virtual Library System User Guide (AH81 - Page 250
Fibre Channel, data migration
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disk array Two or more hard drives combined as a single logical unit for increased capacity, speed, and fault-tolerant operation. Disk arrays are logically grouped into a storage pool. disk mirroring Also known as data mirroring. disk striping The process of dividing a body of data into blocks and spreading the data blocks across several partitions on several disks. disk-to-disk backup The backing up data on disks rather than on tape. Disk-to-disk backup systems provide a very fast single file restore capability compared with disk-to-tape backup. disk-to-disk-to-tape The process of archiving in which data is initially copied to backup storage on backup a disk-based storage system, such as a VLS, and then periodically copied again to a tape storage system. dynamic disk filesystem A finely-tuned filesystem developed to handle large block I/O typical of a streaming backup and restore environment. This filesystem is optimized for sequential access and very large file sizes. data migration The process of moving data from one storage device to another, such as migrating data from virtual media to physical media. deduplication The process of eliminating duplicate data from the backups on a virtual cartridge to reduce the amount of disk space required. dual port virtual devices Virtual devices (for example, the two host or device ports on each FC card in the node) with connectivity to two ports so that the device can be connected to more than one input or output. echo copy extent A software feature within automigration that automatically synchronizes the physical cartridges to matching virtual cartridges (with the same barcodes) based on user-defined policies, and is totally transparent to the backup application. (Echo copy is similar to mirror copy.) The minimum amount of disk space allocated for writing by the VLS dynamic disk filesystem. A smaller extent reduces wasted disk space, but decreases restore performance. The VLS extent size is 32MB. failover protection A backup operational mode in which the functions of a system component (such as a hard drive or power supply) are assumed by secondary system components when the primary component becomes unavailable through either failure or scheduled down time. Fibre Channel A serial data transport infrastructure and protocol used to implement storage area networks (SANs). file A VLS file is a virtual cartridge. Firesafe The holding area for virtual media that is not assigned to a virtual library. Data cannot be restored from virtual media located in the Firesafe until the media is moved into a library. hot plug The ability to add and remove devices to an appliance while the appliance is running and have the operating system automatically recognize the change. 250 Glossary