Magnetic tape library system wherein write request to a storage unit to be mounted is redirected to a temporary device, and then transferred to the storage unit at an arbitrary time later when the unit is mounted
US5522090A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 8, 1994 |
| Grant date | May 28, 1996 |
| Priority date | — |
| Expiry date | Feb 8, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/90
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In an automatic library system for transportable data storage units, a library storage control reduces the chances of contention for file mounting. The magnetic tape library system 3 includes first read/write apparatus 20 with automatic mounting and second read/write apparatus 30 not requiring automatic mounting. Depending on the utilization of the first read/write apparatus 20, write data is recorded temporarily in a common storage installed in the second read/write apparatus 30. When the utilization of the first read/write apparatus 20 is low, the temporarily stored data is automatically transferred to a data storage unit in the first read/write apparatus 20 in which the data should normally be stored. The handlers and the first read/write apparatus 20 can be used with priority for handling data storage units for read data that require transport from the storage shelf or holder. The apparent number of the read/write apparatus increases by an amount equal to the number of data writes, improving the system throughput.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.