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astrium Space Infrastructure Dok.Nr./Doc. No.: CGS–RIBRE–SUM–0001 Ausgabe/Issue: Überarbtg./Rev.: Seite/Page: 1 B 9–8 Datum/Date: Datum/Date: von /of: 19.10.2001 02.08.2002 9–89 in case a device is successfully allocated for its own use, DBS must request the operation execution . Finally, DBS must request the deallocation of the allocated device. If the allocation of a device is rejected by the FA SAS, DBS can retry the same allocation later. During the time a device is allocated to DBS, the operator cannot access it by its operator interface. The number of devices managed by the FA SAS is configurable with a maximum of 2 devices (See 9.2.3.3.6). The FA SAS allocates preferentially the device 1 to DBS Automatic Archiving operations, and the second device, if existing, to DBS Manual operations (e.g. export of session, retrieving of session data). Both devices are equally accessible for the operator administrative operations. The FA SAS treats one request at a time on a given device. For example, during all the time it is processing a DBS request on device 1, it will not accept any other request concerning that device neither from DBS nor from the user interface. The FA SAS assigns DBS jobs to devices according to o their current internal state (BUSY, IDLE, ALLOCATED), o the last operation executed by the device, o the type of the operation to execute. When a request for EXPORT is received by the FA SAS: if there is no device currently available (idle and not allocated), the request is rejected. if the last operation to be executed on a now idle device was an EXPORT operation, then, the incoming EXPORT operation will be automatically executed on this device (no request to the operator). This allows a set of EXPORT operations to be made on the same disk without interruption. if there is a device currently executing an EXPORT operation, the incoming EXPORT request is rejected. if there is no disk used for EXPORT which is mounted in any device, the FA SAS requests an export disk to the operator for the device 2 preferentially or for device 1 if device 2 is busy. When a request for IMPORT is received by the FA SAS: if there is no device currently available (idle and not allocated), the request is rejected. if the last operation to be executed on a now idle device was an IMPORT operation, then, the incoming IMPORT operation will be automatically executed on this device (no request to the operator). This allows a set of IMPORT operations to be made on the same disk without interruption. if there is a device currently executing an IMPORT operation, the incoming IMPORT request is rejected. if there is no disk used for IMPORT which is mounted in any device, the FA SAS requests an import disk to the operator for the device 2 preferentially or for device 1 if device 2 is busy. When a request for MANUAL ARCHIVE is received by the FA SAS: if there is no device currently available (idle and not allocated), the request is rejected. if the last operation to be executed on a now idle device was an MANUAL ARCHIVE operation, then, the incoming MANUAL ARCHIVE operation will be automatically executed on this device (no request to the operator). This allows a set of MANUAL ARCHIVE operations to be made on the same disk without interruption. Copyright per DIN 34
