VIRTUAL TAPE SERVER AND METHOD FOR CONTROLLING TAPE MOUNTING OF THE SAME
First Claim
1. A method of a virtual tape server for processing a mount request from a host system, the method comprising the steps of:
- receiving a logical-volume mount request from the host system using a virtual-tape drive of the virtual tape server;
determining whether the logical volume is present in a virtual storage region of the virtual tape server using a controller in the virtual tape server connected to the virtual-tape drive;
determining using the controller, if it is determined that the logical volume is not present in the virtual storage region, whether the mount request is a write request; and
notifying, if it is determined that the mount request is a write request, the host system of completion of the mounting without reading the requested logical volume from a physical tape library that is externally connected to the virtual tape server into the virtual storage region.
2 Assignments
0 Petitions
Accused Products
Abstract
A method of a virtual tape server (VTS) for processing a mount request from a host system, the method comprising the steps of receiving a logical-volume (LVOL) mount request from the host system using a virtual-tape drive (VTD) of the virtual tape server; determining whether the logical volume is present in a virtual storage region (cache) using a controller in the virtual tape server; determining using the controller, if it is determined that the logical volume is not present in the virtual storage region, whether the mount request is a write request; and notifying, if it is determined that the mount request is a write request, the host system of completion of the mounting without reading the requested logical volume from a physical tape library that is externally connected to the virtual tape server into the virtual storage region.
32 Citations
17 Claims
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1. A method of a virtual tape server for processing a mount request from a host system, the method comprising the steps of:
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receiving a logical-volume mount request from the host system using a virtual-tape drive of the virtual tape server; determining whether the logical volume is present in a virtual storage region of the virtual tape server using a controller in the virtual tape server connected to the virtual-tape drive; determining using the controller, if it is determined that the logical volume is not present in the virtual storage region, whether the mount request is a write request; and notifying, if it is determined that the mount request is a write request, the host system of completion of the mounting without reading the requested logical volume from a physical tape library that is externally connected to the virtual tape server into the virtual storage region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A virtual tape server (VTS) that processes a mount request from a host system, comprising:
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at least one virtual-tape drive (VTD) that receives a logical-volume (LVOL) mount request from the host system; a virtual storage region that stores the logical volume; and control means connected to the virtual-tape drive and determining whether the logical volume is present in the virtual storage region, and if it is determined that the logical volume is not present in the virtual storage region, determining whether the mount request is a write request, wherein if it is determined that the mount request is a write request, the control means notifies the host system of completion of the mounting without reading the requested logical volume from a physical tape library that is externally connected to the virtual tape server into the virtual storage region. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification