Browse Prior Art Database

Open Ended Mass Storage System

IP.com Disclosure Number: IPCOM000085985D
Original Publication Date: 1976-Jul-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 3 page(s) / 43K

Publishing Venue

IBM

Related People

Arter, NK: AUTHOR [+2]

Abstract

A mass storage system (MSS) has a finite addressing capability. Generally, the data in a mass storage facility (MSF) is addressed on a cartridge or volume basis and staged to a virtually driven address base disk storage facility (DSF) via one or more staging adapter-directors (SAD). The staging and destaging between MSF and DSF via SAD is under control of the mass storage control (MSC).

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Open Ended Mass Storage System

A mass storage system (MSS) has a finite addressing capability. Generally, the data in a mass storage facility (MSF) is addressed on a cartridge or volume basis and staged to a virtually driven address base disk storage facility (DSF) via one or more staging adapter-directors (SAD). The staging and destaging between MSF and DSF via SAD is under control of the mass storage control (MSC).

The primary host may control the MSC for ensuring that the appropriate data signals are stored in DSF for access by any of a host connected to MSS. The MSF has a predetermined capacity, for example, 20,000 cartridges. In some data processing installations, it may be desirable to have a greater number of data cartridges available to one or more of the user hosts.

To achieve a greater capacity, cartridge staging is used between auxiliary MSF's (AMSF) and the MSF in the operating MSS. A data cartridge exchange (DCX) extends between MSF and one or more of the AMSF's. The exchange may constitute a gravity slide, pneumatic tubes, or other forms of cartridge transport. Each AMSF is controlled by a mass storage auxiliary facility control (MSAFC). Each MSAFC is controlled by a SYSGEN designated inventory control host.

All transfers are on a cartridge or volume basis either in a virtual or real addressing environment. In addition, when a large plurality of AMSF's are employed, the auxiliary units may be in a staging hierarchy for facilitating access to important data sets contained in the various data cartridges or volumes.

As data cartridges are exchanged between an AMSF and MSF, operational control and inventory tracking of the data cartridges is transferred between the designated inventory control host and the mass storag...