Virtual Storage Manager (Vsm); Virtual Library Extension (Vle) - Oracle StorageTek SL3000 System Assurance Manual

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performance of tape investments by performing detailed performance trending
analyses. These analyses are based on a regularly updated database of library
operations.

Virtual Storage Manager (VSM)

VSM stores virtual tape volumes on a disk buffer called the Virtual Tape Storage
Subsystem (VTSS). VSM then migrates the virtual tape volumes to tape media
mounted on real tape drives in the library. This optimizes access time and throughput
of data to physical tape media. The primary host software for VSM is the Virtual Tape
Control System (VTCS). VTCS manages virtual tape volumes and drives, which
includes the migration and recall of virtual volumes and the use of real tape cartridges
and drives.

Virtual Library Extension (VLE)

Virtual Library Extension (VLE) can be added to a VSM for additional capacity. VLE
provides an economical second tier of disk storage that can be used to boost the
overall VSM storage capacity or to use VSM as a tapeless virtual library.
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