HP 12000 HP 12200 Gateway Virtual Library System User Guide (BW403-10001, June - Page 195
Fibre Channel, dynamic disk
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deduplication The process of eliminating duplicate data from the backups on a virtual cartridge to reduce the amount of disk space required. 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 backup The process of archiving in which data is initially copied to backup storage on a disk-based storage system, such as a VLS, and then periodically copied again to a tape storage system. 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. 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. E 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. See also data restore.. F failover protection fault tolerance Fibre Channel file Firesafe 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. The capacity to cope with internal hardware problems without interrupting the system's data availability, often by using backup systems brought online when a failure is detected. Many systems provide fault tolerance by using RAID architecture to give protection against loss of data when a single disk drive fails. Using RAID 1, 3, 5, 6, 10, or 50 techniques, the RAID controller can reconstruct data from a failed disk drive and write it to a spare or replacement disk drive. A data transfer architecture designed for mass storage devices and other peripheral devices that require high bandwidth. A VLS file is a virtual cartridge. 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. H 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. I infrastructure initiator The physical hardware used to interconnect computers. Infrastructure also includes the software used to send, receive, and manage the signals that are transmitted. A media (host) server that runs the backup/restore application that passes commands and data between the network and the VLS. 195