For slower hosts lto tape drives can adapt the tape

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For slower hosts, LTO tape drives can adapt the tape speed in order to match the feed data rate to maintain streaming of the tape. However, the tape drive would not be writing at its maximum possible speed if it must slow down.
Accelerated SAN Essentials 13 -18 © 2010 Hewlett-Packard Development Company, L.P. UC434S F.00 Virtual Tape Libraries Virtual Tape Libraries Emulates popular libraries and tapes to backup software Do more backup jobs in parallel Reduced backup times Fast single file restore Compression uses disk capacity efficiently Fibre Channel and iSCSI interfaces Configured to use RAID6 A Virtual Tape Library (VTL) is a dedicated computing appliance that emulates the drives of a physical tape library and stores backup images to disk. Backup applications, like HP Data Protector, use the VTL emulated tape and library devices for backups when in fact it is an array-based appliance. The VTL consists of three components: computer hardware, a RAID-based array of disk drives, and application software which emulates a tape library. Improved backup and restore efficiency and Performance The VLS can emulate multiple tape drives and tape devices, allowing for simultaneous backup of multiple servers to a single device. Accessing files and data from disk-based storage simplifies the restore process and can improve performance from hours to minutes. Improved data availability The VLS emulates enough devices that you are now able to service restore requests during the backup window— something that is cost- prohibitive with a strictly physical tape solution. Unattended (automated) backup HP Virtual Library Systems work with compatible backup software applications to provide automated backup of all application and file data while simplifying and improving the reliability of the backup process.
Data protection UC434S F.00 © 2010 Hewlett-Packard Development Company, L.P. 13 -19 Reduced media management requirements and costs The VLS uses disk-based storage to store all application and file data, decreasing both the issues and costs associated with tape media management. Efficient use of storage capacity The HP Virtual Library System includes user-enabled compression allowing the effective capacity to double.
Accelerated SAN Essentials 13 -20 © 2010 Hewlett-Packard Development Company, L.P. UC434S F.00 VTL in practice VTL in practice Faster Backups Faster Restores C onfiguration Time MB /s P hysical Tape 7 min 23 sec (443 sec) 29.34 Virtual Tape (no compression) 3 min 10 sec (190 sec) 68.42 Virtual Tape (with compression) 4 min 12 sec (252 sec) 51.58 R es tore Type R es tore Time S erver 1 from physical tape 2 min 6 sec (126 sec) S erver 3 from physical tape 3 min (180 sec) S erver 1 from virtual tape (no compression) 22 sec S erver 3 from virtual tape (no compression) 20 sec The example above shows five servers. Servers 1 and 2 have network connections to the backup server, while Servers 3, 4, and 5 have SAN-attached storage residing on the HP StorageWorks Modular Smart Array 1000 (MSA1000). The configuration

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