HP StorageWorks 300 HP StorageWorks 300 Virtual Library System user guide (AH1 - Page 173
virtual tape library. Software emulation of a physical tape library is called
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logical unit number (LUN) LUN mapping LUN masking virtual tape library. Software emulation of a physical tape library is called a virtual tape library. See also virtual tape library. An address used in the SCSI protocol to access a device within a target. In the case of the VLS, a LUN is assigned to each virtual library and tape drive. A mechanism of changing the LUN assignments for a specific host. An authorization process that makes a LUN available to some hosts and unavailable to other hosts. master server A computer that provides administration and control for backup and restore operations for all clients and servers in a master and media server cluster. This is called the primary node on the VLS300. When configuring the VLS300, set the primary node using the letter "m". mean time until data loss (MTDL) The average time until a component failure can be expected to cause data loss. This includes the consideration that RAID redundancy can protect against data loss from the failure of a single component. media access con- A low-level unique hardware identifier for every Ethernet port in the world that trol (MAC) address is physically stored inside a network card or similar network interface. MAC addresses are assigned by the IEEE. media server A computer whose purpose is to move or copy data from one location to another, such as from network clients to tape cartridges in a library. node A server that contains the hardware and software required to run a virtual library system. This refers to a hardware assembly containing a power supply, cooling fans, motherboard, expansion boards, and internal hard drives to support the VLS system. oversubscription A condition that exists when more virtual media storage is configured on a VLS than there is physical storage available. Because the VLS dynamically allocates storage space as user data is written, the VLS allows you to allocate more storage for virtual media than is physically available. port mapping primary node A mechanism of assigning a LUN (virtual device), such as a virtual library or tape drive, to a specific FC host port. Port mapping allows you to load-balance the LUNs among the FC host ports to maximize bandwidth. At this time, you must manually load-balance the virtual tape drives in a VLS. On the VLS300, a computer (node) that provides primary administrating and control for backup and restore operations on a server cluster and provides communication and control for all secondary servers on the system. When configuring the VLS300, designate the primary node as such using the letter "m". RAID RAID 1-level data storage RAID 5-level data storage A RAID volume appears to the operating system to be a single logical disk. RAID improves performance by disk striping, which involves partitioning each drive's storage space into units. By placing data on multiple disks, I/O operations can overlap in a balanced way, improving performance. Consists of at least two drives that uses mirroring (100% duplication of the storage of data). There is no striping. Read performance is improved since either disk can be read at the same time. Write performance is the same as for single disk storage. Provides data striping at the byte level and also stripe error correction information. RAID 5 configurations can tolerate one drive failure. Even with a failed drive, the data in a RAID 5 volume can still be accessed normally. HP StorageWorks 173