Bull S.a.

Bull Sas

Jacques Delepoulle

Daniel Carteau

Laurent Cargemel

A disk cache device for secure writing comprising a backup power supply source ( ) for supplying backup power for a given duration to a computer system fed by two main electric power supply devices ( ) and comprising at least one hard disk drive ( ), and a host system ( ). All of the disk drives ( ) are linked by a bus ( ) to a connection ( ) of the host system ( ) (host bus adapter), and a monitor ( ) for monitoring at least the backup electric power supply source ( ) and the main power supply devices ( ). Monitors ( ) are connected to the interface ( ) and can be interrogated by an interrogator ( ) for interrogating the host system ( ) so that the latter can enable the write disk cache function, or not, in the write commands to be sent to the disk drives ( ) in accordance with the information gathered by the monitoring means ( ).

Disk cache device and method for secure writing of hard disks in mass memory subsystems

The present invention relates to a disk storage subsystem with multiple configurable interfaces, characterized in that it comprises at least one interface adapter board ( ), at least one drawer ( ), each comprising a plurality of disks ( ), each drawer ( ) being connected to an adapter board ( or ) by SCSI disk interfaces ( ), a first adapter board ( or ) comprising a switch ( ) for modifying the addressing system of the disks ( ) of at least one drawer ( ), the adapter board or boards ( ) each comprising two independent single-ended/differential-ended SE/DE converters ( ), each SE/DE converter ( ) being connected to a drawer ( ) and fed by either of two direct current/direct current DC/DC converters ( ) of the adapter board ( ), and two external SCSI connectors ( ) being connected to each SE/DE converter ( ).

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Saint Germain de la Grange, France

Jacques Delepoulle